Auxin is a plant hormone. Like hormones in animals, auxin signals other cells. I

Question

Auxin is a plant hormone. Like hormones in animals, auxin signals other cells. In broad leaf plants (not grasses), auxin signals cells to become longer, resulting in growth of tissues in the meristems (the growing tips of buds, shoots, and roots). The herbicide 2,4 – D simulates the effects of auxin in plants but is unaffected by the normal feedback systems that control growth. What would you expect is the cause of plant death when 2,4 – D is applied?

a. The plants fail to grow.

b. The plants grow more slowly.

c. The nuclei of plants fail to make mRNA.

d. The plants grow faster and use up their stored energy reserves (like starch). e. The plants fail to mount an immune response.

Explanation / Answer

Auxin is a plant hormone. Like hormones in animals, auxin signals other cells. I

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