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The given diagram shows the carpel of an insect pollinated flower. What is the most likely reason for the non germination of pollen grain Z?(A) Pollen grains X and Y were brought to the stigma earlier, therefore, their germination inhibited the germination of pollen grain Z. (B) Pollen grain Z was brought to the flower by wind, while pollen grains X and Y were brought to the flower by insects. (C) Pollen grain Z lacks protrusions that allow it to adhere properly onto the stigma surface. (D) Pollen grain Z comes from a flower of an incompatible species. |
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Answer» Correct option (D) Pollen grain Z comes from a flower of an incompatible species. Explanation: Pollen grains can only germinate if the pollen grain and stigma are compatible, i.e., of the same or closely related species, Pollen grains X and Y must have come from a compatible species. Only compatible pollen grains germinate and form pollen tubes. |
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