Question

Which of the following is NOT a natural agent that brings pollen grains to the receptive stigma?

Options

• Insects

• Gravity

• Water

• Wind

Answer 1

The source material specifies that pollen grains arrive on the receptive stigma by wind, insects, water, or other agents. Gravity alone is not mentioned as a primary pollination agent, though it may play a secondary role. The main vectors are wind, insects, water, and other specialized agents.