Question

The length of pollen tube depends on the distance between

• A. Pollen grain and upper surface of stigma
• B. Pollen grain on upper surface of stigma and ovule
• C. Pollen grain in anther and upper surface of stigma
• D. Upper surface of stigma and lower part of style

Answer 1

The correct option is B

Pollen grain on upper surface of stigma and ovule

The correct option is B.

Explanation of the correct option:

1. The pollen tube is responsible for transporting male gametes to the ovule, which contains the egg.
2. As pollen germinates and develops into a pollen tube.
3. It reaches up to the ovule within the ovary and releases the male gametes to fuse with female gametes.
4. The pollen tube length is determined by the distance that is to be covered by the tube to reach the ovule from the stigma.

Final answer: Length of pollen tube depends on the distance between pollen grain on the upper surface of stigma and ovule.