Question

Angiosperms depend on external agents for pollination because ________ .

• A. pollen grains are non-motile.
• B. pollen grains are motile.
• C. male gametes are motile.
• D. female gametes are motile.

Hint:

Think about whether pollen grains can move on their own.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
In flowering plants the male gametes are carried inside pollen grains.

Step 2: Reason
Pollen grains cannot move by themselves, and the stigma is at a distance on the same or another flower. So pollen has to be carried there.

Step 3: Conclusion
Wind, water, insects, birds and other agents transfer pollen. Hence the dependence is due to non-motile pollen grains.

Final Answer:
Angiosperms depend on external agents because pollen grains are non-motile. \[ \boxed{\text{(A) }\text{pollen grains are non-motile.}} \]