A student has taken a twig from a plant. She/ | vedclass

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(B) When a twig is freshly cut from a plant,the fluid that exudes from the cut surface is primarily phloem sap.Phloem sap consists of water,sugars (ma

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Phloem sap

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(B) When a twig is freshly cut from a plant,the fluid that exudes from the cut surface is primarily phloem sap.Phloem sap consists of water,sugars (mainly sucrose),amino acids,and other organic nutrients being transported from the source (leaves) to the sink (other plant parts).Since the phloem is under positive pressure (pressure flow hypothesis),cutting the stem causes the sap to exude from the phloem tubes.Therefore,the correct answer is $B$.

$A$ student has taken a twig from a plant. She/he observes a droplet of fluid exuding from the cut surface of the twig. What is this fluid?

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