CBSE Class 10 Biology How Do Organisms Reproduce Worksheet Set B

Read and download free pdf of CBSE Class 10 Biology How Do Organisms Reproduce Worksheet Set B. 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

CBSE Class 10 Biology - How Do Organisms Reproduce (2)

VERY SHORT ANSWER TYPE(1 MARK)

Q1)Name a plant where buds develop on the leaves to produce new plants.

Q2)A large variety of plants like banana, rose and sugarcane are grown by vegetative means.Give reasons.

Q3)What do we call the undifferentiated mass of cells formed during tissue culture?

Q4)Mention a disadvantage of vegetative propagation.

Q5)Describe fragmentation in Spirogyra with the help of diagram.

Q6)How does sexual reproduction result in variation /diversity of characters in the offspring?

Q7)How many male gametes are formed by a pollen grain?

Q8)What is ovulation?

Q9)Why are petals scented and coloured?

Q10)Which organ enables the developing foetus to obtain nourishment from the mother’s blood?

Q11)Name the structure formed after fertilization of ovum by the sperm.

Q12)What is menopause?

Q13)Name the causative organism of AIDS.

Q14)Name the female gonad and female gametes.

Q15)Name two biotic agents of pollination.

Q16)Name two abiotic agents of pollination.

Q17)What happens if the mature ovum is not fertilized in a female?

Q18)What does the term ‘menarche’ signify?

Q19)Write name of one male and one female sex hormone.

SHORT ANSWER TYPE-1(2MARKS)

Q1)Define reproduction.why is it important?

Q2)Mention two features of asexual reproduction.

Q3)Mention the two most common methods of asexual reproduction in plant.

Q4)Name the type of reproduction involved in the following;

(i) a slice of bread has greenish –yellow patches.

(ii) Potato in the store-room starts sprouting.

Q5)Mention two fungi that reproduce asexually by spore formation.(Rhizopus,yeast)

Q6)How do organisms reproduce by budding?

Q7)Give the name of a unicellular and a multicellular organism which reproduce by budding.(hintyeast,

hydra)

Q8)Name any two curable sexually transmitted diseases?

Q9)Give two reasons why frequent pregnancies must be control.

Q10_How do barrier methods prevent fertilization?

Q11)Describe surgical methods of birth control?

Q12)Reproduction is linked to stability of population of a species.Justify this statement.

Q13)Why changes are observed in the uterus if fertilization doesnot take place?

Q14)Why changes are observed in the uterus subsequent to implantation of young embryo?

Q15)Give two reasons for the appearance of variation among the offspring formed by sexual reproduction.

SHORT ANSWER TYPE-11(3 MARKS)

Q1)Describe the different methods of natural vegetative propagation.

Q2)How does plasmodium reproduce by multiple fission?

Q3)Describe budding in yeast?

Q4)Describe asexual reproduction. How do the following organisms reproduce?

a)Amoeba b)Plasmodium c)Hydra

 

More Important Questions For How Do Organisms Reproduce


Question. Name the method by which spirogyra reproduces under favourable conditions. Is this method sexual or asexual?
Ans. Under favourable conditions spirogyra reproduces by a process known as fragmentation. This is an asexual mode of reproduction.

Directions: In the following questions, a statement of assertion(A) is followed by a statement of reason(R).
Mark the correct choice as:
(a)Both assertion (A) and reason(R)are true and reason(R)is the correct explanation of assertion(A)
(b)Both assertion (A) and reason(R) are true but reason (R) is not the correct explanation of assertion (A)
(c)Assertion (A) is true but reason(R) is false
(d)Assertion (A) is false but reason (R)is true

Question. Draw a labeled diagram of a human male reproductive system.
Ans.

CBSE Class 10 Biology How Do Organisms Reproduce Worksheet Set B

Question.Which of these life processes of an organism helps in the growth of its population?
(a)Nutrition
(b) Respiration
(c) Reproduction
(d) Excretion

Answer : (c) Reproduction

Question.How will an organism benefit if it reproduces through spores?
Ans. The reproduction by spores takes place in plants. Spores are covered by hard protective coat which enables them to survive in unfavorable conditions such as lack of food, water and extreme temperatures. When the conditions are favorable the spores can grow to produce new plants. Thus reproduction by spores’ benefits the plant because by surviving under adverse conditions, the spores make these plants live forever.

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
(c) doubling of chromosomes after gamete formation
(d) halving of chromosomes after gamete formation

Answer : (b) halving of chromosomes during gamete formation

Question. Define pollination. Explain the different types of pollination. List two agents of pollination. How suitable pollination does leads to fertilization?
Ans. Pollination: -Transfer of pollen from anther to stigma of the flower.

Types of pollination:
(a) Self Pollination: Transfer of pollen from anther to stigma occurs in the same flower.

CBSE Class 10 Biology How Do Organisms Reproduce Worksheet Set B

(b) Cross Pollination: Pollen is transferred from anther of one flower to stigma of another flower.

CBSE Class 10 Biology How Do Organisms Reproduce Worksheet Set B

Agents of pollination: Wind, Water, Insects and Animals

Agents of pollination: Wind, Water, Insects and Animals
A tube grows out of the pollen grain and travels through the style, to reach the female germ cell in the ovary to cause fertilization.

Class 10 Science How Do Organisms Reproduce Notes and Questions 

Short Answer Questions 

Question: What is puberty?
Answer: Puberty – Age when reproductive system functionally active or starts producing ova or
sperm is called puberty.

Question: What is tubectomy?
Answer: Removal of a section of fallopian tube.

Question: A couple wants to space the birth of their second child. Suggest one preventive method which could be observed 
(a) By the husband (b) By the wife for the same.
Ans. (a) Use of condoms by the husband
(b) Use of oral pills or loop or Copper-T by the wife.

Question: Blue prints of body design are stored in the DNA. Why? 
Ans. The chromosomes present in the nucleus of a cell contain information for inheritance of features from parents to next generation in the form of DNA molecule. The DNA is the information source for making proteins. Thus, blueprints of the body design are stored in the DNA.

Question: Protozoan reproduce by binary fission as well as by multiple fission. In your opinion which process is better and why? 
Ans. Multiple fission is better than binary fission because:-
1. More number of individuals is produced.
2. It helps to tide over unfavourable conditions.

Question: A pregnant woman visits a doctor to determine the sex of her child. The doctor refused to perform the test. Why is she being denied? 
Ans. The doctor refused to perform the test in order to prevent female foeticide which leads to an alarming decline in child sex ratio.

Question: Producing individuals by parents consume a lot of energy. So, why should an individual organism waste energy in the process, it does not need to stay alive?
Ans. Reproduction, unlike other life processes is not essential to maintain the life of an individual organism. But it is essential for providing stability to the population of species. Maintaining the species is essential for maintaining balance in nature.

Question: A girl attains her puberty at the age of 11 years and a boy at 13 years but, still they are asked to refrain from sex, why?
Ans. They are asked to refrain from sex because:-
1. They are not physically, emotionally mature enough to be able to bear the responsibility of the child.
2. They may suffer from reproductive tract infections.

Question: What changes occur in girls and boys in the age group of 10 -14 years?
Ans. Changes in males (boys)
1) Widening of shoulder.
2) Deepening of voice
3) Appearance of beard and moustaches
4) Growth of sex organs
Changes in females (girls)
1) Widening of pelvis and hips.
2) High pitch voice.
3) Growth of auxiliary and pubic hair
4) Initiation of menstrual cycle.
5) Growth of mammary glands.

Question: Mention the events taking place when the ovum is fertilized in fallopian tube till it is implanted in the uterus of human female.
Ans. After fertilization, the zygote starts dividing by repeated mitotic divisions called cleavage. In about 4 -5 days after fertilization, zygote becomes a multicellular structure called blastocyst. The blasto cyst gets attached to the lining of uterus is called implantation.

Question: How does the embryo get nourishment inside the mother’s body?
Ans. The embryo gets nutrition from the mother’s blood with the help of a special tissue called placenta. This is a disc which is embedded in the wall of uterus. It contains finger-like projections villi on the embryo’s side of the tissue. On mother’s sides are blood spaces, which surround the villi. This provides a large surface area for glucose and oxygen to pass the mother to the embryo and waste products from embryo to mother.

Question: Name the surgical methods of birth control in human males and females respectively.
Ans. Surgical methods of birth control are –
a) Castration – Removal of testes from the body of a male
b) Ovariectomy – Removal of ovaries from the body of a female
c) Vasectomy – small pieces of both the vas deferens are cut and removed.
d) Tubectomy – Small pieces of both the fallopian tubes are removed.
e) Laparoscopy – Fallopian tubes are blocked with the help of an instrument called laparoscope

Question: What are the post fertilizational changes in the flower?
Ans. Post – fertilization changes in flowers are –
a) The sepals, petals and stamens wither off
b) Style and stigma degenerate
c) Ovary develops into fruit
d) Ovules grows into seed
e) Integuments of the ovule act as seed coats.
f) Fertilized egg gets converted into embryo which bear plumule, radicle and cotyledons.
g) Fertilized polar nuclei form endosperm which may or may not be consumed during seed development.

Question: What is micropropogation? Mention its advantages.
Ans. Micropropagation – It is a type of artificial vegetative propagation in which an isolated plant part is cultured under aseptic conditions with proper nutrient medium. Advantages of micropropagation.
a) It is a quick method of multiplication of plants.
b) Virus free plants are produced by this method from virus infected plants
c) It can overcome seed dormancy

Question: What are the major factors responsible for population explosion?
Ans. Reason for population explosion –
(i) Better medical facilities – Better medical facilities have resulted in fall of death rate.
(ii) Lack of education and awareness – This is a major factor since people become prey to ignorance
(iii) Religions – For some people, family planning is against the norms set by their religion.
(iv) Control over epidemics – Various medical technologies has made it possible to fight against epidemics.
(v) Sanitary conditions – There is a lot of improvement in sanitary conditions which led to increase in population.

 

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