Geography, 23.10.2019 19:00 sydthekid25

Why is the direction of phloem transport opposite in early spring and late fall? a. the temperature changes can reverse the flow in late fall b. the direction of sieve plates in the phloem sieve tube elements become opposite at different times c. the availability of water can change the bulk-flow of food in the phloem d. the source and sink are on opposite sides in early spring and late fall

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Why is the direction of phloem transport opposite in early spring and late fall? a. the temperature...