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(C) In plants,the direction of movement of phloem sap (sucrose) is determined by the source and the sink. The source is the part of the plant that pro

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Season and plant's needs

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(C) In plants,the direction of movement of phloem sap (sucrose) is determined by the source and the sink. The source is the part of the plant that produces sugar (e.g.,leaves),and the sink is the part that consumes or stores it (e.g.,roots,fruits,or developing buds). This direction is not fixed; it can change depending on the season and the plant's needs. For example,in early spring,the sugar stored in roots (which act as a source) is moved to the developing buds (which act as a sink) to support new growth. Therefore,the season and the plant's physiological needs are the primary factors responsible for changing the source-sink relationship.

Which of the following is responsible for changing the direction of the source and sink in plants?

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