The Pressure- Flow Mechanism for Sugar Translocation You Have Learned

question 13

Multiple Choice

The pressure- flow mechanism for sugar translocation you have learned about is based on research on angiosperms, and thus might not occur in other vascular plants. Which of the following real or hypothetical observations on gymnosperms would suggest they possess a different mechanism?

• A) Formation of buds is supported by products of photosynthesis primarily from leaves on the same branch.
• B) Pores in the sieve areas of their sieve- tube members are filled with numerous membranes.
• C) Asymmetric annual growth rings occur in gymnosperms.
• D) Bidirectional phloem transport occurs in gymnosperms.
• E) Gymnosperms do not possess vessels.

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