Question

Which of the following statements is true with reference to cross pollination?

• A. It most often results in higher yield of plants.
• B. It occurs only in unisexual flowers.
• C. It can fail to occur due to distance.
• D. It requires production of large number of pollen grains.

Answer 1

The correct option is D It requires production of large number of pollen grains.

Cross pollination: The transfer of pollen from the anthers of one flower to the stigma of another flower by the action of wind, insects, etc. It requires production of large number of pollen grains. Progeny shows enhanced vigor.
Offsprings are more viable and resistant. There is a possibility to get new desirable characters. Yield of crop can be maintained. It helps in evolution.
Undesirable characters of the plant can be eliminated.

Thus, the correct answer is option D.