Which of the following is the best explanatio | vedclass

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(B) The excurrent or pyramidal shape of $Pinus$ is primarily due to the phenomenon of apical dominance.Apical dominance is controlled by the hormone a

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The effect of auxins on growth of stem tips

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(B) The excurrent or pyramidal shape of $Pinus$ is primarily due to the phenomenon of apical dominance.Apical dominance is controlled by the hormone auxin,which is produced in the terminal buds (stem tips).This hormone inhibits the growth of lateral buds,causing the main stem to grow vertically much faster than the side branches.As a result,the branches are shorter at the top and longer at the bottom,giving the tree its characteristic conical or pyramidal appearance.

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)?

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