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प्रश्न
Which of the following is NOT a natural agent that brings pollen grains to the receptive stigma?
विकल्प
Insects
Gravity
Water
Wind
MCQ
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उत्तर
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.
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