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Identify the correct statement about fer...

Identify the correct statement about fertilization.
I. Pollen grain germinates on the stigma.
II. The filiform apparatus guides the pollen grain to the egg.
III. The micropyle doesn't allow entry of male gametes .
IV Pollen pistil interaction determines the promotion or inhibition of pollen.

A

I and IV

B

I and II

C

II and IV

D

II and III

Text Solution

AI Generated Solution

The correct Answer is:
To identify the correct statements about fertilization, let's analyze each statement one by one: ### Step 1: Analyze Statement I **Statement I:** Pollen grain germinates on the stigma. - **Explanation:** This statement is correct. When pollen grains land on the stigma of a flower, they germinate and form a pollen tube that grows down the style towards the ovule. ### Step 2: Analyze Statement II **Statement II:** The filiform apparatus guides the pollen grain to the egg. - **Explanation:** This statement is incorrect. The filiform apparatus is part of the synergids in the embryo sac, and its role is to guide the pollen tube (not the pollen grain itself) towards the egg cell for fertilization. ### Step 3: Analyze Statement III **Statement III:** The micropyle doesn't allow entry of male gametes. - **Explanation:** This statement is incorrect. The micropyle is the opening in the ovule through which the pollen tube enters, allowing the male gametes to reach the egg cell. Therefore, it does allow entry. ### Step 4: Analyze Statement IV **Statement IV:** Pollen-pistil interaction determines the promotion or inhibition of pollen. - **Explanation:** This statement is correct. The interaction between the pollen and the pistil plays a crucial role in determining whether fertilization occurs. If the pollen is compatible with the pistil, it will promote fertilization; if not, it will inhibit it. ### Conclusion After analyzing all four statements: - **Correct Statements:** I and IV - **Incorrect Statements:** II and III Thus, the correct answer is that statements I and IV are correct. ### Final Answer: The correct statements about fertilization are I and IV. ---
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