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The image is not clear and hence unable to answer the first question. 

 

Second question, the answer is 4. 

Cut at Section A must cause Leave Y to wither. So it must be deep enough to cut the water carrying tubes, which are located interior behind the food carrying tubes.

Cut at Section B must be less deep (1cm) to chop the food carrying tubes and retain the water carrying tubes. 

 

0 Replies 1 Like ✔Accepted Answer

Q1: water carrying tube is up arrow; food carrying tube is down arrow.

0 Replies 1 Like
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