CBSE Class 10 Biology How Do Organisms Reproduce Worksheet Set C

Read and download free pdf of CBSE Class 10 Biology How Do Organisms Reproduce Worksheet Set C. Download printable Science Class 10 Worksheets in pdf format, CBSE Class 10 Science Chapter 8 How do the Organisms Reproduce Worksheet has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Science Class 10 Assignments and practice them daily to get better marks in tests and exams for Class 10. Free chapter wise worksheets with answers have been designed by Class 10 teachers as per latest examination pattern

Chapter 8 How do the Organisms Reproduce Science Worksheet for Class 10

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Class 10 Science Chapter 8 How do the Organisms Reproduce Worksheet Pdf


MCQ Questions for NCERT Class 10 Science How do the Organisms Reproduce

Question. Which of the following diseases is/are transmitted through sexual contact?
(a) AIDS
(b) Gonorrhoea
(c) Syphillis
(d) Hepatitis
Answer : A , B

Question. Conception occurs
(a) before ovulation
(b) after ovulation when sperm is not there
(c) after ovulation when sperm fertilizes the ovum
(d) when the ovum lies in the ovary
Answer : C

Question. The following figure represents   
(a) fragmentation
(b) binary fission
(c) multiple fission
(d) budding    
Answer : B

Question. Pollen tube grows out of pollen grain and reaches the ovary finally through
(a) anther
(b) stigma
(c) germ cell
(d) style
Answer : D

Question. Which of the following changes occurs during adolescence in boys?
(a) Cracking of voice
(b) Increase in weight
(c) Breakage of milk teeth
(d) Increase in height
Answer : A , B ,D

Question. Which of the following statements are true?
(a) Gametes are formed during sexual reproduction.
(b) Gametes fuse to form zygote.
(c) Offspring formed after sexual reproduction are similar to each other.
(d) DNA from two different individuals are combined during sexual reproduction.
Answer : A , B , D

Question. Which of the following represents the correct sequence of organs for transport of sperms in man?
(a) Ureter → Testis → Urethra
(b) Vas deferens → Urethra → Testis
(c) Testis → Vas deferens → Urethra
(d) Testis → Ureter → Urethra
Answer : C

Question. The process by which embryo gets embedded in the wall of the uterus is called
(a) implantation
(b) adolescence
(c) menstruation
(d) parturition
Answer : A

Question. What are the means of reproduction in unfavourable conditions?
(a) Budding
(b) Multiple fission
(c) Spore formation
(d) Fragmentation
Answer : B , C

Question. Which of the following does not occur in the female?
(a) Prostate gland
(b) Urethra
(c) Uterus
(d) Vas deferens
Answer : A , D

Question. What is applicable with respect to the Fallopiantube?
(a) The embryo is implanted here.
(b) It is ligated in vasectomy.
(c) Fertilization occurs here.
(d) Oestrogen is secreted from here.
Answer : C

Question. Sperms from the testis pass through
(a) urinary bladder
(b) vas deferens
(c) scrotum
(d) prostate gland
Answer : B

Question. Which organ(s) lie(s) outside the abdominal cavity?
(a) Testis
(b) Seminal vesicle
(c) Prostate gland
(d) Penis
Answer : A ,D

Question. In the following figure parts A, B, and C represent      
(a) radicle, plumule and cotyledons respectively
(b) plumule, radicle and cotyledons respectively
(c) radicle, cotyledons and plumule respectively
(d) cotyledons, plumule and radicle respectively
Answer : D

Question. The female sex organ of a flower consists of
(a) sepals
(b) pollen sacs
(c) ovary
(d) stigma
Answer : C , D

Question. Parturition occurs
(a) before gestation
(b) after gestation
(c) before implantation
(d) during menstruation
Answer : B

Question. The reproductive organs in human females include
(a) ovary, uterus, testis and vagina
(b) uterus, vagina, prostate gland and urethra
(c) ovaries, Fallopian tubes, uterus and vagina
(d) ovaries, uterus, vagina and scrotum
Answer : C

Question : Which of the following plants reproduce through spores? 
(a) Rose
(b) Amoeba
(c) Hydra
(d) Penicillin
 
Answer :  D
Explanation: Penicillin reproduce by the method of spore formation.Asexual reproduction begins with the formation of asexual non-motile spores known as conidia, which are borne on the erect, aerial hyphae called conidiophores. The conidiophore may be branched or unbranched.

Question. In which of the following aspects does multiple fission differs from binary fission?
(i) Number of offsprings produced.
(ii) Level of genetic variation in offsprings.
(iii) Number of parents involved.
(iv) Multiple fission happens in Plasmodium whereas binary fission happens in Leishmania.
(a) Only (i) is correct
(b) Both (i) and (iv) are correct
(b) (iii) is correct
(d) (ii) is correct

Answer: B

Question. In Spirogyra, asexual reproduction takes place by
(a) breaking up of filaments into smaller bits.
(b) division of a cell into two cells.
(b) division of a cell into many cells.
(d) formation of young cells from older cells.

Answer: A

Question. From the figure identify parts labeled a, b and c.
(a) Pollen grains, anther, filament
(b) Anther, pollen grains, filament
(b) Filament, anther, pollen grains
(d) Filament, pollen grains, anther

Answer: A

Question. Which of the following statements is NOT true regarding asexual reproduction in plants?
(a) Plants that reproduce asexually reach maturity faster than those who reproduce sexually.
(b) Plants that reproduce asexually have greater genetic diversity than those who reproduce sexually.
(b) Plants that reproduce asexually are more stable than those who reproduce sexually.
(d) Plants that reproduce asexually create offspring that are identical to the parent plant.

Answer: B

Question. The number of chromosomes in parents and offspring of a particular species remains constant due to 
(a) doubling of chromosomes after zygote formation.
(b) halving of chromosomes during gamete formation.
(b) doubling of chromosomes after gamete formation.
(d) halving of chromosomes after gamete formation.

Answer: B

Question. What happens when a Planarian (plural-Planaria) is cut into many fragments?
(a) All fragments regenerate into new organisms.
(b) Only the head containing fragment regenerates into a new organism.
(b) Nearly half of the fragments regenerate into new organisms.
(d) No changes are seen in fragments. Planaria reproduce by budding.

Answer: A

Question. A feature of reproduction that is common to Amoeba, Spirogyra and yeast is that
(a) they reproduce asexually.
(b) they are all unicellular.
(b) they reproduce only sexually.
(d) they are all multicellular.

Answer: A

Question. In figure, the parts A, B and C are sequentially 60
(a) cotyledon, plumule and radicle
(b) plumule, radicle and cotyledon
(b) plumule, cotyledon and radicle
(d) radicle, cotyledon and plumule

Answer: C

Question. Which of the following is the correct sequence of events of sexual reproduction in a flower? 
(a) Pollination, fertilisation, seedling, embroy
(b) Seedling, embryo, fertilisation, pollination
(b) Pollination, fertilisation, embryo, seedling
(d) Embryo, seedling, pollination, fertilisation

Answer: C

Question. Which of the following is a product of meiosis?
(a) Microspore mother cell
(b) Endosperm nucleus (primary)
(b) Megaspore mother cell
(d) Megaspore

Answer: D

Question : Name the kind of reproduction in bees in which males are produced.
(a) Parthenogenesis
(b) sexual reproduction
(c) Grafting
(d) Asexual reproduction
 
Answer :  A
Explanation: parthenogenesis is a type of asexual reproduction in which the offspring develops from unfertilized eggs
 
Question : Which of the following is not a part of female reproductive system in human beings? 
(a) Fallopian tube
(b) Ovary
(c) Uterus
(d) Vas deferens
 
Answer :  D
Explanation: It is a part of the male reproductive system
 
Question : The budding in Yeast is illustrated by the diagram: 
P-6
(a) C
(b) B
(c) D
(d) A
 
Answer :  B
Explanation: The bud in the yeast appears as a protuberance.
 
Question : Which of the following is a birth control measure 
A. IUCD
B. Vasectomy
C. Tubectomy
D. Contraceptive Pills
(a) B and C
(b) A, B and D
(c) A and B
(d) All of these
 
Answer : D
Explanation: All of the following can be used for birth control. IUCD, Vasectomy, Tubectomy are surgical methods of birth control whereas contraceptive pills are oral pills
 
Question : Which among the following diseases is not sexually transmitted? 
(a) syphilis
(b) HIV – AIDS
(c) Hepatitis A
(d) Gonorrhoea
 
Answer :  A
Explanation: Hepatitis A virus is spread through contaminated fecal matter
 
Question : In Amoeba, binary fission takes place by the following steps:
i. The cellular constriction increases and divides the whole body into equal halves and form two daughter Amoeba
ii. A constriction appears in the cell membrane and nuclear membrane
iii. Each daughter Amoeba contains a nucleus surrounded by cytoplasm and cell membrane.
iv. Nuclear constriction increases and divides the nucleus into two daughter nuclei 
The correct sequence is :
(a) (ii), (iv), (i), (iii)
(b) (iv), (i), (ii), (iii)
(c) (iii), (iv), (i), (ii)
(d) (i), (ii), (iii), (iv)
 
Answer : A
Explanation: Amoeba is a unicellular organism. They reproduce by fission asexually, different from human’s method..It has a porous cell membrane which encloses the cell organelles and cytoplasm. After replicating its genetic material through mitotic(equal)division, the cell divides into two equal sized daughter cells. The genetic material is also equally partitioned; therefore the daughter cells are genetically identical to each other and the parent cell. In this process, the nucleus of the Amoeba first divides to form two daughter nuclei by the process of Karyokinesis(division of cell

 

nucleus). After the nucleus has divided into two, the process of Cytokinesis(division of cytoplasm) takes place in which the cytoplasm in the mother cell divides into two daughter cells. This leads to the formation of the two daughter Amoebae cell having a nucleus and its own cell organelles.
 
Question : The specific scientific term for the release of ovum from ovary into body cavity is 
(a) Menopause
(b) puberty
(c) ovulation
(d) menstrual cycle
 
Answer :  C
Explanation: In humans, this event occurs when the de Graaf's follicles rupture and release the secondary oocyte ovarian cells. 
 

Assertion and Reasoning Based Questions :

Question. Assertion: Pollen grains reaches directly to the egg, which is seated deep in the ovarian cavity.
Reason: To effect fertilization, the pollen grains germinate on the stigma.

Answer: If assertion is false, but reason is true.

Question. Assertion: In male reproductive system, transport of sperm takes place in a fluid which also provide nutrition.
Reason: Prostate glands and seminal vesicles secrete their secretions

Answer: If both assertion and reason are true and reason is the correct explanation of assertion.

Question. Assertion: Plants raised by vegetative propagation can bear flower and seed earlier than those produced from seeds.
Reason: Plants which have lost the capacity to bear viable seeds, can propagate through vegetative propagation.

Answer:  If both assertion and reason are true, but reason is not the correct explanation of assertion.

Question. Assertion: Ovary releases one egg every month.
Reason: The lining of uterus is always thick and spongy.

Answer: If assertion is true, but reason is false.

Question. Assertion: HIV/AIDS is a viral disease.
Reason: HIV infection is spread by sexual contact with an infected person.

Answer: If both assertion and reason are true, but reason is not the correct explanation of assertion.

ASSERTION REASON QUESTIONS

Question. Assertion (A): Testes lie in penis outside the body.
Reason (R): Sperms require temperature lower than the body temperature for development
Answer : Assertion is false, reason is true.

Question. Assertion (A): Unisexual flowers have separate male and female flowers whereas a typical monocot embryo comprises an embryonal axis with single cotyledon.
Reason (R): Cucumber, pumpkin and water melon are example of unisexual flowers.
Answer : both A and R are true but R is not the correct explanation for A.

CASE STUDY QUESTIONS

Menstrual cycle is the cycle of events taking place in female reproductive organs, under the control of sex hormones, in every 28 days. At an interval of 28 days, a single egg is released from either of two ovaries. Regular menstrual cycle stopped abruptly in a married women. She got herself tested and was happy to discover that she is pregnant with her first baby.

Question. Why menstruation stops in a pregnant female?
(a) The egg gets fertilised so need not to be expelled out of body
(b) Ovulation stops during pregnancy and so do menstruation
(c) Thick uterine lining is needed for proper development of embryo, so that it is retained
(d) All of these
Answer : D

Question. Select the correct sequence of acts that leads to pregnancy in a female.
A. Fertilisation of egg
B. Ovulation
C. Formation of zygote
D. Implantation
(a) D ⇒⇒C ⇒⇒B ⇒⇒A
(b) B⇒⇒ A⇒⇒C⇒⇒D
(c) A ⇒⇒ B⇒⇒ C⇒⇒ D
(d) D⇒⇒ C⇒⇒ A ⇒⇒B
Answer : B

Question. How is a zygote different from embryo?
(a) Zygote is formed by repeated division of embryo
(b) Zygote is formed by fusion of sperm and egg whereas embryo is formed by fusion of zygote with other zygote
(c) Zygote is single celled but embryo is multicellular
(d) Zygote is formed by fertilisation but embryo is formed without fertilisation
Answer : C

Question. What change takes place in the uterus of a pregnant female?
(a) Uterine lining becomes thick and vascular
(b) Placenta develops which links the embryo to mother through umbilical cord
(c) Uterus lining containing lots of blood capillaries breaks down
(d) Both (a) and (b)
Answer : A

Important Questions for NCERT Class 10 Science How do the Organisms Reproduce
 
 

Very Short Answer:

 
Question : Name the causative organism of AIDS? 
Answer : HIV - Human Immunodeficiency virus. 

Question. Name the causative organisms for the following diseases:
(a) AIDS
(b) Warts
(c) Gonorrhoea
(d) Syphilis
Answer: (a) virus
(b) virus
(c) bacteria
(d) bacteria

Question. Name the causative agent of the disease “Kala-azar” and its mode of asexual reproduction. 
Answer: Leishmania causes kala-azar. It reproduces by binary fission.

Question. Sterilisation in males is called .
Answer: vasectomy

Question. Name the parts of a bisexual flower that are not directly involved in reproduction. 
Answer: Parts of a bisexual flower which are not directly involved in reproduction are
(i) Petal, (ii) Sepal and (iii) Stem.

Question. Name the parts of the human female reproductive system where implantation of the fertilised egg occurs.
Answer: Implantation of fertilized egg takes place in the uterus.

Question. What is DNA? 
Answer: The full form of DNA is deoxyribonucleic acid. DNA lies in the cell nucleus which is the information source for making proteins, and different proteins lead to different designs.

Question. Which one of the STDs damages the immune system of human body? 
Answer: AIDS damages the immune system of human body.

Question. Write suitable conditions necessary for seed germination. 
Answer: Conditions necessary for seed germination are water, temperature and oxygen.

Question. Name the contraceptive device which protects a person from acquiring sexually transmitted diseases.
Answer: Condom.

Question. In Rhizopus the fine thread like structures spread on the whole surface of slice of bread are called .
Answer: hyphae

Question. State what type of method is used for growing jasmine plant.
Answer: Artificial methods of vegetative propagation like layering is used for growing jasmine plant.

Question. Name the floral parts of a plant that develop into (i) Fruit (ii) Seeds. 
Answer: (i) Fruit: Ovary
(ii) Seed: Ovule

Question. What is carpel?
Answer: It is the female reproductive organ of the plant.

Question. Name the part of female reproductive system where the egg is fertilized. 
Answer: Egg gets fertilized in the oviduct.

Question. What is the average duration of human pregnancy? 
Answer: The average duration of human pregnancy is 40 weeks or 280 days.

Question. What is the difference between fission and fragmentation?
Answer: In fission, an unicellular organism breaks up to form two new organisms whereas in case of fragmentation a multicellular organisms breaks up to form two new organisms.

Question. What are those organisms called which bear both the sex organs in the same individual. Give one example of such organism. 
Answer: Organisms which bear both the sex organs are called hermaphrodite/bisexual.
Example: Earthworm

Question : Which floral part is very attractive and coloured? 
Answer :  Petals are colourful so that insects and birds can be attracted to assist the flower in pollination.

Question : What is the role of the seminal vesicles and the prostate gland? 
Answer :  Secretions of seminal vesicles and prostate gland provide fluid medium to sperm to move and also provide nutrition to them. 

Question : Gonorrhoea, Syphilis and AIDS.
Answer : Name any three sexually transmitted diseases (STDs). 
 
Question : Write the technical term for the following: 
i) Funnel lying close to the ovary
ii) The period of endometrial repair and regeneration.
iii) Copulation chamber in the human female.
Answer :  i) Funnel lying close to the ovary: Infundibulum
ii) The period of endometrial repair and regeneration.:Proliferative phase

 

iii) Copulation chamber in the human female.: Vagina
 
Question : Select any two plants which are cultivated by vegetative propagation from those given below. Jasmine, lemon, tomato, wheat, rose, gram. 

Answer : Vegetative propagation is a form of asexual reproduction in which plants has ability to produce new plants from the vegetative parts, such as leaves, stem and roots, under favourable conditions. Jasmine, lemon and rose are vegetatively propagated plants.

 

Short Answer :

 
Question : Differentiate between stamen and carpel. 
Answer :  Differences between stamen and carpel
P-7 
 
 
Question : What is the difference between binary fission and multiple fission? 
Answer :  Binary Fission :
(i) Nucleus divides into two parts.
(ii) It occurs during normal conditions.
(iii) It gives rise to two individuals.
(iv) Cytoplasm divides after each nuclear division.
e.g., Amoeba.
Multiple Fission :
(i) Nucleus divides into many parts.
(ii) It takes place during unfavourable conditions (Encysted stage),
(iii) It forms many individuals.
(iv) Cytoplasm does not divide after every nuciear division.
e.g., Plasmodium.
 
Question : Differentiate asexual and sexual reproduction. 
Answer :  Differences between Asexual and Sexual forms of Reproduction
P-17
 
 
Question : Given below is the diagram of a reproductive system. 
P-14
i. Name the system.
ii. Name the parts labelled as A-I.
iii. Describe the functions of parts C, D, E and F.
Answer :  i. It is the male reproductive system of humans.
ii. A-Seminal vesicle
B-Bladder
C-Prostate gland
D-Penis
E-Urethra
F-Testis
G- Scrotum
H-Vas deferens
I-Ureter
iii. Functions
C-Its secretion form 20-30% of semen, which is essential for the mobility of sperms.
D-It transfers sperm into the vagina of the female during copulation.
E-It is a common passage for both sperms and urine.
F-It produces sperms and male sex hormones called testosterone.
 
Question :  During sexual reproduction, the amount of DNA does not get doubled. Explain. 
Answer : During sexual reproduction, the reproducing cells or germ cells have half the number (amount) of chromosomes and DNA as compared to somatic or body cells or nonreproducing cells. As the offspring receives one DNA copy from each parent, this complex mechanism helps to maintain the amount of DNA constant in an individual.
If the DNA had to get doubled during sexual reproduction, then each generation would have double the amount of DNA content as compared to the previous generation. That is why, the amount of DNA does not get doubled during sexual reproduction.

Question. How are spores produced in sporangium of Rhizopus?
Answer : 

a) A spore is a small microscopic structure with a thick wall. b) Spores are generally formed in a structure called sporangium which reassembles formed in a structure called sporangium which resemble blob on – a – stick. c) Sporangia are formed at the tip of erect fungal hypha. d) In each sporangium, a nucleus divides several times producing a large number of nuclei. Nuclei get surrounded by a little cytoplasm and develop into thick – walled cells or spores. e) The wall of sporangium breaks to release the spores in air. f) On germination in the presence of moist surface, each spore gives rise to a new organism.
CBSE Class 10 Biology How Do Organisms Reproduce

Question. What is the importance of DNA copying in reproduction?
Answer : DNA contains information for the inheritance of features from parents to next generation. DNA presents in nucleus of cells are the information source for making protein. If information is different, different protein will be made that lead to altered body design.

Question. What are the limitation of the asexual mode of reproduction? differentiate between asexual reproduction and sexual reproduction.
Answer : In asexual reproduction very little variation occurs within generation. Asexual reproduction has a lesser significance for evolution of species. Asexual reproduction involves only a single individual. It does not require two sexes. Sexual reproduction involves two different individuals, male and female sexes. The offspring is produced due to fission of male and female gametes.

Question. What are the various methods of vegetative propagation? Discuss any one method with example.
Answer : The various types of vegetative propagation are
• Cutting
• Layering
• Grafting
• Parthenogenesis
• Micro-propagation in vitro
• Grafting
• It is a method in which two parts of different plants are joined together in such a way that they unite and grow as one plant.
• The portion of the plant that is grafted onto another plant is known as the scion, and the plant on which grafting is performed is known as the stock.
• The stock and the scion are tied in such a way that the cambium of the scion and the stock come in contact with each other.
• The stock is so chosen that it possesses qualities like disease resistance, high water absorbing capacity, deep penetrating roots for a firm hold, etc. The scion is so chosen that it possesses qualities like high yield of pulp or seeds (as desired) from a single fruit, etc.
• For example, citrus-root stock is used for a variety of grafts like sweet orange, lime, grape, etc.

 
Question : Explain the term 'Regeneration' as used in relation to reproduction of organism.
Describe briefly how regeneration is carried out in multicellular organisms like Hydra? 
Answer :  Regeneration is a term which is used in relation to reproduction. Which means producing its own kind likewise regeneration is the ability of some organisms to give rise to new organisms when the individual is cut or broken up into many pieces, it is seen in multicellular organisms e.g Hydra and Planaria.
Regeneration in multicellular organism like Hydra
i. It is carried out by specialised cells.
ii. When Hydra is cut or broken up into many piecs these specialised cells proliferate and make large number of cells.
iii. From the mass of cells, differentiation occurs developing various cell types and tissues.
iv. These changes take place in an organised sequence which lead to development of new individual

DESCRIPTVE TYPE QUESTIONS

Question. Define the terms unisexual and bisexual giving one example of each.
Answer : 

The flowers which contain only the male or female reproductive organs are called unisexual flowers. They are called incomplete flowers. To reproduce they undergo cross-pollination. Examples: Papaya, White mulberry and Watermelon.
The flowers which contain both male and female reproductive organs are known as full or bisexual flowers. They will self-pollinate themselves. Examples: Tulip, Sunflower and Lily.

Question. (a) Draw a diagram showing germination of pollen on stigma of a flower.
(b) Label pollen grain, male germ- cells, pollen tube and female germ-cell in the above diagram.
(c) How is zygote formed?
Answer : 

a and b
CBSE Class 10 Biology How Do Organisms Reproduce
C. Zygote is formed when male gamete fuses with the egg.

Question.List any three differences between pollination and fertilisation.
Answer : 

CBSE Class 10 Biology How Do Organisms Reproduce

Question. Draw a longitudinal section of a flower and label the following parts:
(i) Part that produces pollen grain.
(ii)Part that transfers male gametes to the female gametes.
(iii) Part that is sticky to trap the pollen grain.
(iv) Part that develops into a fruit.
Answer : 
 i)anther ii)pollen tube iii) stigma iv)ovary
CBSE Class 10 Biology How Do Organisms Reproduce

Question. Name the female reproductive part of a flower. Which part of a flower develops into a seed and a fruit? Where are the male germ cell and female gamete present in the flower?
Answer :
 Female reproductive part of a flower is pistil. Ovary develops into fruit and ovule into seed. Male germ cell is present in pollen grain and female germ cell in the ovary.

 
 

Long Answer :

 
 
Question : Draw a well labeled diagram of female reproductive system and mention its parts. 
Answer :  a. A pair of ovaries- ovaries produces ova and female sex hormone. One egg is produced every month by one of the ovaries. Ova are picked up by the funnel shaped fallopian tubes.
b. Fallopian tubes- There are two fallopian tubes. It carries ova from ovary to the uterus. Fertilization occurs in fallopian tubes.
c. Uterus- Pear shaped hollow muscular organ. Fertilized ovum remains attached to the uterus wall.
d. Vagina- It is a narrow muscular tube. Its upper end is connected to the cervix of the uterus and lower end opens outside through an opening. It is a place for copulation.
P-8 
 
 
Question : Describe regeneration in Planaria. 
Answer :  Regeneration in Planaria : When the anterior end of Planaria is cut along the length into two more parts, each part develops into a new head, resulting in a many headed planaria.
 
P-18
 
If the body is cut into three, four or more pieces, each piece regenerate the missing parts. A noteworthy observation in this case is that a piece from the middle always regenerates a head towards its anterior side and tail towards its posterior side. In other words, each piece maintains its original polarity. A possible explanation of this fact is that in Planaria, the metabolic activity and hence capacity for regeneration, is the greatest at the anterior end, gradually decreases posteriorly and is minimum at the posterior end. Correspondingly, the anterior end of each piece, having greater metabolic activity, regenerative anterior part of the body and the posterior end remain as such. 
 
 
Question : With the help of a labelled diagram describe double fertilization in plants. 
Answer : Double fertilization: In Angiosperms both the male gametes are functional. Double fertilization is a process in which egg nucleus and secondary nucleus are fertilized at one time by two male gametic nuclei. The fusion of one male gamete nucleus (IN) with egg or oosphere (IN) is called syngamy and results in the formation of oospore (2N).
The fusion of second make nucleus (IN) with secondary nucleus (2N) is called triple fusion which results in formation of primary endosperm nucleus (3N).
Significance.
i. Double fertilization provides stimulus to endosperm mother cell for the formation of nutritive tissue named endosperm.
ii. It ensures continued supply of nourishment to the embryo that develops from zygote.

 P-15

 
 
 
 
 
 
HIGHER ORDER THINKING SKILLS (HOTS) QUESTIONS
 
1) Give two reasons for the appearance or variations among the progeny formed by sexual reproduction.
CBSE_Class_10_Biology_organism_1
2) Colonies of yeast fail to multiply in water but multiply in sugar solution. Give one reason.
 
3) The type of reproduction seen in the figure is :-
a) Budding b) Grafting
c) Fragmentation d) Vegetative Propagation.
 
4) Malarial parasite divides into many daughter individual simultaneously through multiple fission. State an advantage the parasite gets because of this type of reproduction.
 
5) If a woman is using copper-T, will it help in protecting her from sexually transmitted diseases.
 
6) What is the importance of DNA copying in reproduction?
 
7) Why is vegetative propagation practiced for growing some types of plants?
 
8) How does reproduction help in providing stability to population of species?
 
9) Why are the testes extra abdominal in location?
 
10) What would be the reason for adopting contraceptive methods?
 
11) Name those parts of flower, which serve the same function as the following do in the animals?
a) Testis c) Eggs
b) Ovary d) Sperms
 
12) Label any 6 parts in the given figure. What are the functions performed by them in human beings? What is the role of 2 and 4?
CBSE_Class_10_Biology_organism_2
 
FORMATIVE ASSESSMENT-III
 
 
Very Short Answer Type Questions: -
 
Note: - Each question carries 1 Mark.
 
1) What is reproduction?
 
2) Have you seen seeds of rose or potato? Name some plants whose seeds you may have seen.
 
3) Can an Amoeba and Hydra reproduce like human beings?
 
4) What changes are observed in the uterus if fertilization occurs?
 
5) Define fertilization.
 
 
 
Short Answer Type Questions
 
Note: Each question carries two marks: -
 
(6) In the human body, what is the role of (a) seminal vesicle (b) prostate gland?
 
(7) State the difference between Menarch and Menopause?
 
(8) What is variation? Mention the importance of DNA copying in reproduction.
 
Answer the Following
 
Note: --Each question carries 3 marks each.
9) Name three types of asexual reproduction with example for each.
 
10) Label the diagram according to the numbers given.
CBSE_Class_10_Biology_organism_3
11) Practical skill based MCQs. (Each question carries one mark.)
 
I) The following figures illustrate budding in yeast. Which is the correct Sequence?
CBSE_Class_10_Biology_organism_4 
II) The following figures illustrate binary fission in Amoeba in an incorrect Sequence:
CBSE_Class_10_Biology_organism_5
The correct sequence is:
(a) (i),(iii),(iv),(ii) (b)(ii),(iii),(iv),(i) (c)(iv),(iii),(ii),(i) (d)(iii),(iv),(ii),(i)
 
III) Which of the following shows spore formation?
CBSE_Class_10_Biology_organism_6
LONG ANSWERS TYPE QUESTION:--
(FIVE MARKS)
 
1) How is sexual reproduction better than asexual reproduction? What is the role of ovaries in female reproductory system? Where does the fertilization take place in female body?(2,I,2 marks)
--
FORMATIVE ASSESMENT- IV
  PICTURE BASED QUIZ.
1. The figure given below shows the male reproductive system.
CBSE_Class_10_Biology_organism_7
(A) Label B ……………. (B) Label D………………………
2. What is the function of D given in above figure?
 
Activity—To grow Rhizopus & prepare its temporary slide.
Aim: To show asexual reproduction in an organism.
App: Slice of bread, water, box, slide, cover slip.
 
Procedure: Children grow Rhizopus on slice of bread and make a temporary slide.
 
Project: a) To study manner of vegetative reproduction in some commercially useful plants.
                 b) To study the seeds during sprouting period.
 
Seminar: Reproductive health and sexually transmitted diseases: Children form the groups and discuss.
 
Symposium: Gender related problems: female infanticide.
 
Group discussion: If there was no sexual reproduction.
 
Debate: Is it necessary to learn about reproductive health from class VII?
 

Case Based Questions :

Read the passage carefully and answer the following questions from Reproduction is a biological process by which new individual organisms are produced. Reproduction is a fundamental feature of all life forms; each individual exists due to the process of reproduction. Reproduction is the mechanism of species continuation. Mechanism and process of reproduction varies for different species in this world.

Question. Vegetative propagation is a type of: 
(a) farming
(b) reproduction
(c) cooking
(d) movement control

Answer: B

Question. Organisms in which reproduction is a function of a specific cell type are: 
(a) multicellular organisms
(b) amoeba
(c) unicellular organisms
(d) bacteria

Answer: A

Question. Which one of the following is not a method of reproduction? 
(a) Regeneration
(b) Budding
(c) Spore formation
(d) Vegetation

Answer: D

Question. Which of the following statement is not true about reproduction? 
(a) Organisms create exact copies of themselves.
(b) Creation of a DNA copy is a basic event in reproduction.
(c) Simply breaking up into smaller pieces upon maturation is also a method of reproduction.
(d) Cell division in unicellular organisms is the method of reproduction.

Answer: A

Question. The ability of cell to divide into several cells during reproduction in plasmodium is called __________ . 
(a) budding
(b) reproductive division
(c) multiple fission
(d) binary fission

Answer: C

Read the passage carefully and answer the following questions from Asexual reproduction, in which offspring arise from a single organism, occurs in a variety of prokaryotes and eukaryotes including plants, fungi, and animals. It may have some advantages over the sexual reproduction, in which individuals of two genders, females and males, must be involved but only females can give birth to new individuals. There are several different methods of asexual reproduction. Asexual reproduction can be very rapid. This is an advantage for many organisms. It allows them to crowd out other organisms that reproduce more slowly.

Question. Hydra and Planaria can be cut into any number of pieces and each piece grows into a complete organism. This is known as: 
(a) regeneration
(b) budding
(c) fragmentation
(d) speciation

Answer: A

Question. In amoeba the splitting of the two cells during division can take place in ______ plane. 
(a) single
(b) perpendicular
(c) directional
(d) any

Answer: D

Question. Budding is a mode of asexual reproduction in: 
(a) amoeba
(b) plasmodium
(c) yeast
(d) leishmania

Answer: C

Question. The specific reproductive part in Rhizopus responsible for reproduction is: 
(a) sporadic
(b) stick
(c) hyphae
(d) sporangia

Answer: D

Question. Buds produced in the notches along the leaf margin of Bryophyllum fall on the soil and develop into new plants. This is an example of: 
(a) vegetation
(b) vegetative propagation
(c) sexual reproduction
(d) clone formation

Answer: B

Read the passage carefully and answer the following questions from Sexual reproduction is the most common method of reproduction in animals and plants. One male and one female parent are involved in the process of sexual reproduction. Sexual reproduction involves fusion of two types of reproductive cells known as gametes to form a single cell called zygote. The zygote multiplies repeatedly and undergoes specific changes to form a new individual.

Question. In plants, after fertilisation, the zygote divides several times to form an embryo within the ovule. The ovule develops a tough coat and is converted gradually into a: 
(a) bud
(b) seed
(c) fruit
(d) plant

Answer: B

Question._____ is the male reproductive part in a plant and it produces pollen grains that are yellowish in colour. 
(a) Stamen
(b) Pistil
(c) Carpel
(d) Petal

Answer: A

Question. What is the source of variations in populations of organisms? 
(a) DNA copying is error free
(b) DNA copying is not error free
(c) Protein formation
(d) Involvement of only one parent

Answer: B

Question. The reproductive parts of angiospermsarelocated in the: 
(a) fruit
(b) pistil
(c) flower
(d) stigma

Answer: C

Question. As the rate of general body growth begins to slow down, reproductive tissues begin to mature. This period during adolescence is known as: 
(a) puberty
(b) adulthood
(c) germination
(d) reproduction

Answer: B

Read the passage carefully and answer the following questions from Sexual reproduction is a method to give rise to one’s progeny. In higher animals, male and female gametes are produced by different individuals to carry out sexual reproduction. Such individuals are said to be unisexual. However, in some animals like flatworm, earthworm, leech, and hydra both male and female gametes are produced by the same individual. Such organisms are said to be hermaphrodites or bisexual. Male and female gametes fertilise to form a zygote that has trail of characters from both the parents.

Question. Why are pollens spiny? 
(a) Help in Fertilisation
(b) For easy pollination
(c) To attach to bodies of insects
(d) Appearance

Answer: C

Question. What is the principle of natural contraceptive methods? 
(a) Avoiding sperm and ovum to meet
(b) Avoiding release of egg
(c) Avoiding release of sperm
(d) Abortion when pregnant

Answer: A

Question. Where does fertilisation occur in human females? 
(a) Cervix
(b) Vagina
(c) Uterus
(d) Oviduct

Answer: D

Question. The offspring formed by sexual reproduction exhibit more variations because _________. 
(a) sexual reproduction is a lengthy process
(b) genetic material comes from two parents of different species
(c) genetic material comes from two parents of same species
(d) genetic material comes only from one parent

Answer: C

Question. The number of chromosomes present in parents and offspring of a particular species remains constant due to ________. 
(a) doubling of chromosomes during zygote formation
(b) halving of chromosomes during gamete formation
(c) doubling of chromosomes after gamete formation
(d) halving of chromosomes after gamete formation

Answer: B

The below given picture shows a few methods of contraception and avoiding sexually transmitted diseases in humans. See the picture carefully and answer the following questions from 

CBSE Class 10 Biology How Do Organisms Reproduce Worksheet Set C

Question. Use of condom for contraception is a: 
(a) mechanical method
(b) surgical method
(c) hormonal method
(d) chemical method

Answer: A

Question. The best way to avoid sexually transmitted diseases is by use of: 
(a) a condom
(b) medicine
(b) chemical
(d) IV injection

Answer: A

Question. Which one of the following statements is not true? 
(a) Prenatal sex determination has been prohibited by law in India.
(b) Illegal sex-selective abortion of female foetus in India is the prime reason for unbalanced male to female sex ratio.
(c) Contraceptive pills change hormonal balance in a female body.
(d) Mechanical barriers for contraception is available only for males.

Answer: D

Question. Which one out of the below given terms is STD? 
(a) Kala azar
(b) Jaundice
(c) Pyorrhea
(d) Syphilis

Answer: D

Question. IUCD is used for: 
(a) Vegetative propagation
(b) Prevent miscarriage
(c) Contraception
(d) In vitro fertilisation

Answer: C

Chapter 06 Life Processes
CBSE Class 10 Biology Excretion Set A
CBSE Class 10 Biology Excretion Set B
CBSE Class 10 Biology Excretion Set C
CBSE Class 10 Biology Heterotrophic Nutrition Worksheet Set A
CBSE Class 10 Biology Heterotrophic Nutrition Worksheet Set B
CBSE Class 10 Biology Life Processes Nutrition In Animals Worksheet
CBSE Class 10 Biology Life Processes Nutrition In Plants Worksheet
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set A
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set B
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set C
CBSE Class 10 Biology Life Processes Nutrition Worksheet Set D
CBSE Class 10 Biology Life Processes Reference Materials Worksheet
CBSE Class 10 Biology Life Processes Respiration In Animals Worksheet
CBSE Class 10 Biology Life Processes Respiration Worksheet Set A
CBSE Class 10 Biology Life Processes Respiration Worksheet Set B
CBSE Class 10 Biology Life Processes Respiration Worksheet Set C
CBSE Class 10 Biology Life Processes Respiration Worksheet Set D
CBSE Class 10 Biology Life Processes Transporation Worksheet Set A
CBSE Class 10 Biology Life Processes Transporation Worksheet Set B
CBSE Class 10 Biology Life Processes Transporation Worksheet Set C
CBSE Class 10 Biology Life Processes Transporation Worksheet Set D
CBSE Class 10 Biology Life Processes Worksheet
CBSE Class 10 Biology Life Processes Worksheet Set A
CBSE Class 10 Biology Life Processes Worksheet Set B
CBSE Class 10 Biology Life Processes Worksheet Set C
CBSE Class 10 Biology Life Processes Worksheet Set D
CBSE Class 10 Biology Life Processes Worksheet Set E
Chapter 09 Heredity and Evolution
CBSE Class 10 Biology Heredity And Evolution Set D
Chapter 13 Magnetic Effects of Electric Current
CBSE Class 10 Physics Magnetic Effects of Electric Current Worksheet Set E

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