CBSE Class 10 Biology How Do Organisms Reproduce Worksheet Set A

Read and download free pdf of CBSE Class 10 Biology How Do Organisms Reproduce Worksheet Set A. Students and teachers of Class 10 Biology can get free printable Worksheets for Class 10 Biology in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 10 students should practice questions and answers given here for Biology in Grade 10 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 10 Biology Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests

How Do Organisms Reproduce Class 10 Biology Worksheet Pdf

Class 10 Biology students should refer to the following printable worksheet in Pdf for How Do Organisms Reproduce in standard 10. This test paper with questions and answers for Grade 10 Biology will be very useful for exams and help you to score good marks

Class 10 Biology Worksheet for How Do Organisms Reproduce

How Do organisms reproDuce?
 
Question 1: What is the importance of DNA copying in reproduction?
Answer- DNA (Deoxyribonucleic acid) determines the body design of an individual. DNA transfers inherited properties from parents to offsprings. DNA copying is also responsible for variations, which are necessary for development.

Question 2: Why is variation beneficial to the species but not necessarily for the individual?
Answer- Because sometimes for a species, the environmental conditions change so drastically that their survival becomes difficult. So due to variations some individuals will adapt according to the conditions, and will survive. Thus, these variants help in the survival of the species. However, all variations are not necessarily beneficial for the individual organisms.

Question 3: How does binary fission differ from multiple fission?
Answer- In binary fission, a single cell divides into two equal halves. Amoeba and Paramecium divide by binary fission.
In multiple fission, a single cell divides into many daughter cells simultaneously. Plasmodium divide by multiple fission.

Question 4: How will an organism be benefited if it reproduces through spores?
Answer- Spores are distributed easily by air to far-off places to avoid competition at one place. Spores are covered by thick walls to prevent dehydration under unfavourable conditions.

Question 5: Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
Answer- complex organisms have organ-system level of organization. All the organ systems of their body work together as an interconnected unit. So new complete organism cannot be regenerated from any body part.
 
Question 6: Why is vegetative propagation practised for growing some types of plants?
Answer- Some plants which cannot produce seeds or produce dormant seeds are produced by vegetative propagation
 
Question 7: Why is DNA copying an essential part of the process of reproduction?
Answer- DNA (Deoxyribonucleic acid) determines the body design of an individual. DNA transfers inherited properties from parents to offsprings. DNA copying is also responsible for variations, which are necessary for development.
 
Question 8: How is the process of pollination different from fertilization?
Answer-
                     Pollination                                                               Fertilization
1. Pollination is the process of transfer of pollens     1. Fertilization is the fusion of the male and female gametes.
from anther to stigma.
 
2. It is of two types: Self- pollination and cross-      2. It is of two types: Internal and external fertilization.
Pollination
 
Question 9: What is the role of the seminal vesicles and the prostate gland?
Answer- The secretions from seminal vesicles and prostate glands lubricate the sperms and provide a fluid medium for easy transport of sperms. Their secretion also provides nutrients to sperms.
 
Question 10: What are the changes seen in girls at the time of puberty?
Answer- (1) Increase in breast size and darkening of skin of the nipples present at the tips of the breasts.
(2) Appearance of hair in the genital area.
(3) Appearance of hair in other areas of skin like underarms, face, hands, and legs.
(4) Maturity in the reproductive organs.
(4) Beginning of menstrual cycle.
(5) More secretion of oil from the skin, which results in the appearance of pimples.
 
Question 11: How does the embryo get nourishment inside the mother’s body?
Answer- Embryo get nutrients from blood of mother. Inside the uterus, the outer tissue surrounding the embryo develops finger-like projections called villi. These villi are surrounded by uterine tissue and maternal blood. Also, there is a special tissue called placenta, which is embedded in the uterine wall. The embryo receives the oxygen and nutrients from the mother’s blood via the placenta. The waste materials produced by the embryo are also removed through the placenta.
 
Question 12: If a woman is using a copper-T, will it help in protecting her from sexually transmitted diseases?
Answer- No, because it is only contraceptive. It does not prevent the entry of semen.
 
QUESTION-ANSWERS
EXERCISE
 
Question1: Asexual reproduction takes place through budding in
(a) amoeba.    (b) yeast. ✓    (c) plasmodium.    (d) leishmania.

Question 2: Which of the following is not a part of the female reproductive system in human beings?
(a) Ovary     (b) Uterus    (c) Vas deferens ✓    (d) Fallopian tube

Question 3: The anther contains
(a) sepals.    (b) ovules.    (c) carpel.    (d) pollen grains. ✓
 
Question 4: What are the advantages of sexual reproduction over asexual reproduction?
Answer- (1) In sexual reproduction, more variations are produced. Thus, it ensures survival of species in a population.
(2) The new formed individual has characteristics of both the parents.

Question 5: What are the functions performed by the testis in human beings?
Answer- Testes produce sperms and a hormone called testosterone, which brings about secondary sexual characters in boys.

Question 6: Why does menstruation occur?
Answer- Menstruation is a process in which blood and mucous flows out every month through the vagina. This process occurs every month because one egg is released from the ovary every month and at the same time, the uterus (womb) prepares itself to receive the fertilized egg. Thus, the inner lining of the uterus gets thickened and is supplied with blood to nourish the embryo. If the egg does not get fertilized, then the lining of the uterus breaks down slowly and gets released in the form of blood and mucous from the vagina.

Question 7: Draw a labelled diagram of the longitudinal section of a flower.
Answer-
10th.sci.eng.july.aug 24
 
Question 8- What are the different methods of contraception?
Answer- Contraceptive methods
(1) Physical methods like condom, copper-T and loop etc can prevent fertilization.
(2) Oral contraceptive tablets or drugs can prevent the release of egg, thus can stop fertilization.
(3) Surgical methods like vasectomy in man and tubectomy in woman can stop fertilization.
 
Question 9: How are the modes for reproduction different in unicellular and multicellular organisms?
Answer- Unicellular organism reproduce only by asexually reproduction, but most of multicellular organism reproduce by sexual reproduction.
 
Question 10: How does reproduction help in providing stability to populations of species?
Answer- With reproduction an organism produce new individuals that resemble the parents. Also sexual reproduction causes variations, which are necessary for the survival of a species in drastic environmental changes.
 
Question 11: What could be the reasons for adopting contraceptive methods?
Answer- Contraceptive methods are mainly adopted because of the following reasons:
(i) To prevent unwanted pregnancies.
(ii) To control population rise or birth rate.
(iii) To keep appropriate gap between children for good health.
(iv) To prevent the transfer of sexually transmitted diseases.

 

1. Reproduction is not a life process still organisms spend a lot of energy on it .why?

2. What is the basic event in reproduction?

3. Why do we say that similar not same organisms are produced during reproduction?

4. How are variations useful for the survival of species over time?

5. Differentiate between fission and fragmentation

6. How is fission different from budding?

7. How is fission in Amoeba different from fission in leishmania?

8. Name some organisms which can use regeneration as mode of reproduction?

9. Explain how regeneration is carried out?

10. What is the need for contraceptive devices?

11. What are the reasons for poor living standards in our country?

12. What happens when the egg is not fertilized?

13. Is the body ready for reproduction as soon as it reaches puberty?

14. How is a child born at the end of gestation period?

15. What is the role of placenta?

16. Why does the lining of uterus thickens during menstrual cycle?

17. In which part of human female reproductive system does fertilisation occurs?

18. How many eggs are produced at a time in a human body?

19. Which part of the flower changes into fruit?

20. Which part of the flower changes into seed?

21. What is germination?

22. What happens to all the parts of flower after fertilization?

23. Name different agencies of pollination

24. What was the need to generate two different types of gametes?

25. How is amount of DNA maintained in sexually reproducing organisms?

 

More Important Questions For How Do Organisms Reproduce

Question.Name the following:
(a)The process in plants that links light energy with chemical energy.
Ans. Photosynthesis

(b)Organisms that can prepare their own food.
Ans. Autotrophs

(c)The cell organelle where photosynthesis occurs.
Ans. Chloroplast

(d)Cells that surround a stomatal pore.
Ans. Guard cells

(e)Organisms that cannot prepare their own food
Ans. Heterotrophs

(f)An enzyme secreted from gastric glands in stomach that acts on proteins.
Ans. Pepsin

Question. What is reproduction? Lists its two types.
Ans.The production of new organism from the existing organism of the same species is called reproduction.
Types of Reproduction
(i)Asexual reproduction (ii) Sexual reproduction
Asexual Reproduction-The production of new organism from a single parent without the involvement of sex cells (gametes).
Sexual Reproduction-The process of production of new organism from two parents by making use of sex cells (gametes)

Question.In the list of organisms given below, those that does not reproduce by the asexual method are————
(a) Spirogyra
(b) dog
(c) yeast
(d) amoeba

Answer : (b) dog

Question.When an organism breaks into a number of parts and each part develop into an individual, it is called:
(a)Regeneration
(b) Budding
(c) Binary fission
(d) Spore formation

Answer :  (a)Regeneration

Question. State the basic requirement for sexual reproduction? Write the importance of such reproduction in nature.
Ans. Basic requirement for sexual reproduction is formation of male and female gametes, fusion of gametes.

Importance
Combination of DNA from two different individuals leads to increase in genetic variation in the organism.
This leads to diversity in the population which helps in natural selection.

Question. How does Planaria reproduce? Is this method sexual or asexual?
Ans. Planaria reproduces by a process known as regeneration. It is a type of asexual reproduction.

Question.(a)Draw a well labeled diagram to show the process of fertilization in flowering plant.
(b)Explain the process of double fertilization in angiosperm plant.
Ans (a)

CBSE Class 10 Biology How Do Organisms Reproduce Worksheet Set A

 

(b) Double Fertilization– It occurs when one male nucleus fuses with egg cell to form zygote and other male nucleus fuse with two polar nuclei.

Class 10 Science How Do Organisms Reproduce Notes and Questions

objective type questions

Question: Fertilization in plants occurs in the –
a) Embryo sac
b) Style
c) Pollen tube
d) Stigma

Answer: Embryo sac

Question: Which among the following diseases is not sexually transmitted?
a) syphilis
b) Gonorrhoea
c) HIV – AIDS
d) Hepatitis

Answer: Hepatitis

Question: In vegetative reproduction, the new individuals are genetically –
a) Similar
b) Dissimilar
c) Abnormal
d) None of these

Answer: Similar

Question: When an organism breaks into a number of parts and each part develop into an individual, it is called –
a) Budding
b) Binary fission
c) Regeneration
d) Spore formation

Answer: Regeneration

Question: During grafting, the portion of plant that is grafted is called –
a) Stock
b) Scion
c) stalk
d) stem

Answer: Scion

Question: In man, fertilization of ovum takes place in
a) Vagina
b) ovary
c) uterus
d) Fallopian tubes

Answer: Fallopian tubes

Question: Characters that are transmitted from parents to offspring during reproduction show
a) only similarities with parents
b) only variations with parents
c) neither similarities nor variations
d) both similarities and variations with parents

Answer: both similarities and variations with parents

Question: Which part of the flower forms the fruit?
a) Whole flower
b) Only stamens and carpel
c) Only ovary
d) Only carpel

Answer: Only ovary

Question: Anemophily is the pollination by –
a) Birds
b) Rain
c) insects
d) Wind

Answer: Wind

Question: Which of this is seminal fluid?
a) Prostate gland
b) Cowper’s gland
c) Seminal vesicle
d) all of these

Answer: Seminal vesicle

 

Question: A common feature of reproduction in Amoeba, spirogyra and yeast is that –
a) Asexual reproduction occurs after sexual reproduction
b) Asexual reproduction occurs before sexual reproduction
c) Asexual reproduction does not involve gametes
d) Asexual reproduction involves only one parent

 

Answer: Asexual reproduction involves only one parent

 

Question: The normal duration of menstrual cycle is
a) 7 – 8 days
b) 13 – 15 days
c) 3 – 4 days
d) 28 days

 

Answer: 28 days

 

Question: Asexual reproduction takes place through budding in
(a) Amoeba
(b) Yeast
(c) Plasmodium
(d) Leishmania.

 

Answer: Yeast

 

Question: A common feature of reproduction in Amoeba, spirogyra and yeast is that –
a) They reproduce only sexually
b) They are all unicellular
c) they reproduce asexually
d) They are all multicellular

 

Answer: They reproduce asexually

 

Question: The anther contains
(a) Sepals
(b) Ovules
(c) Carpel
(d) Pollen grains.

 

Answer: Pollen grains.

 

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