Why Do Vascular Plants Need Phloem? All Four of the Provided

question 31

Multiple Choice

Why do vascular plants need phloem? All four of the provided answers are correct. Select the answer that BEST explains the existence of phloem.

• A)for chemical signaling between widely separated parts of the plant
• B)because not all parts of the plant are independently autotrophic
• C)to create a "return loop" for xylem flow back to the root
• D)because diffusion is not efficient over long distances

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Aggregate Demand

The total demand for all goods and services in an economy at a given overall price level and within a specified period.

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The total income earned by a nation's people and businesses, including wages, rent, interest, and profits.

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involves deliberate changes by government in taxation and spending policies intended to stabilize or stimulate the economy.

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