Question

how is cross-pollination carried out in nature? cross-pollination occurs when pollen is transferred to the stigma of the same flower. cross-pollination occurs with the help of pollinators, like bees or birds. cross-pollination does not occur in nature.

Explanation:

• The first statement is incorrect because transferring pollen to the stigma of the same flower is self - pollination, not cross - pollination.
• The second statement is correct. In nature, cross - pollination often happens with the assistance of pollinators such as bees (which collect nectar and in the process transfer pollen) and birds (which may brush against pollen - bearing parts of flowers and transfer pollen as they move between flowers).
• The third statement is incorrect as cross - pollination is a common natural process that helps in genetic diversity among plants.

Answer:

B. Cross - pollination occurs with the help of pollinators, like bees or birds.