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Practice each question, then open the answer or worked solution.
In the figure given below, mark the ovule and pericarp.
Ans: The figure below marks the ovule & pericarp.
Ovule-: It is the plant structure that develops into the seeds.
Pericarp-: It is the protective covering of seeds that develops from the ovary.
Why do gametes produced in large numbers in organisms exhibit external fertilization?
Ans: External fertilization is the process which involves the fusion of gametes outside the body of living organisms. In case of external fertilization, the chances of fertilization is very less because gametes can either get blown off by the wind or can be eaten by the predator. Hence, to ensure the fertilization large no. of gametes are produced.
Which of the following are monoecious and dioecious organisms.
a. Earthworm | ______________ |
b. Chara | ______________ |
c. Marchantia | ______________ |
d. Cockroach | ______________ |
Ans:
a. Earthworm | Monoecious animal |
b. Chara | Monoecious plant |
c. Marchantia | Dioecious plant |
d. Cockroach | Dioecious animal |
Match the organisms given in Column-’A’ with the vegetative propagules given in column ‘B’.
Column A | Column B |
i. Bryophyllum | (a) Offset |
ii. Agave | (b) Eyes |
iii. Potato | (c) Leaf buds |
iv. Water hyacinth | (d) Bulbils |
Ans:
Column A | Column B |
i. Bryophyllum | (c) Leaf buds |
ii. Agave | (d) Bulbils |
iii. Potato | (b) Eyes |
iv. Water hyacinth | (a) Offset |
What do the following parts of a flower develop into after fertilization?
a. Ovary ______________
Ans: Fruits
b. Ovules ____________
Ans: Seeds