Holiday Homework Lesson 2

Revision Questions From Lesson 1 - Posted by Anupama Mehtani

Home Work For moday 22 03 10

LESSON 1 - REPRODUCTION
HOME WORK
1 Mark Questions:
1. Both tapeworm and earthworm are hermaphrodites. How do they differ from each
other with respect to fertilization?
2. Why are date palms referred to as dioecious?
3. Name two organisms in which cell division is a mode of reproduction.
4. What marks the end of the vegetative phase in Angiosperms?
5. What are the two major pre-fertilization changes that take place during sexual
reproduction?
6. Which is the carrier of male gametes in sed plants?
7. What are the two factors that decide the development of the zygote?
8. What happens to algae zygote as sson as they are formed?
9. ______________ forms a vital link that ensures continuity of species between
organisms of one generation and next.
10. Where is the zygote formed in a flowering plant?

2 Mark questions:
1. what is the mode of sexual reproduction in:
a) yeast
b) hydra
c) amoeba
d) sponges
2. what are zoospores? Name a group of organisms that produce them.
3. What are the changes that take place during embryogenesis?
4.a) What are meiocytes?
b) What will be the number of chromosomes in the gametes, if 78 chromosomes are
present in the meiocytes of dog?
5. How do cells divide during gamete formation?
6. Differentiate between homogametes and heterogametes.

3 Mark questions:
1. a) Which are the three distinct phases in the lifecycle of annuals and biennials?
b) Why is it difficult to define these phases in perennial plants?
2. Name the three phases during sexual reproduction of organisms and mention the major
events that occur in each of them.
3. What is syngamy? How does it take place in organisms?

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