Self Assessment -Class 10 -Science- Biology-Chapter 7: How Do Organisms Reproduce

Class 10 -Science- Self Assessment  -Biology-Chapter 7: How Do Organisms Reproduce

Very Short Answer

Q1. Name a plant in which vegetative propagation takes place by means of leaves:

Q2. Define sexual reproduction:

Q3. Give one example each of unisexual and bisexual flowers:

Q4. Why do gametes have half the usual number of chromosomes?:

Q5. Which organ enables the developing fetus to obtain nourishment from the mother’s blood?:

Q6. What is contraception?

Short Answer

Q1. Mention two functions of seminal vesicles

Q2. What is meant by implantation of the embryo?

Q3. What is the vas deferens and what is its function?

Q4. Differentiate between vasectomy and tubectomy

Q5. List any three ways in which AIDS is transmitted. Why is this disease considered so dreadful?

Q6. Name one sexually transmitted disease caused by a bacterial infection and one by a viral infection. How can these be prevented?

Long Answer

Q1. What is pollination? Differentiate between self-pollination and cross-pollination. Name some agents of pollination:

Q2. What are the changes seen in girls and boys at the time of puberty?:

Q3. What happens when the ovum is not fertilized?:

Q4. State the role of (a) placenta and (b) umbilical cord in the development of the foetus:

Q5. Give two reasons why a woman should avoid frequent pregnancies. Explain the following methods of contraception giving one example of each:

(i) Barrier method

(ii) Chemical method

(iii) Surgical method