Which of the following is the best explanation for the excurrent (pyramidal) shape of Pinus (the branches giving the plant the appearance of a tall cone)?

Competition among adjoining trees for sunlight

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The effect of auxins on growth of stem tips

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Adaptation for wind pollination

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Efficiency of water transport from ground to leaves

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Solution

The correct option is C Adaptation for wind pollination
Wind pollination (anemophily) in gymnosperms is thought to be an ancestral state. Extensive diversity of male reproductive structures within gymnosperms represents an evolutionary response to long-term selection and results in solutions to the physical restraints of anemophily.
Anemophilous plants possess well-exposed stamens, so that the pollens are exposed to wind currents and also have large and feathery stigma to easily trap airborne pollen grains.

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