First slide

Phloem Transport: Flow from Source to Sink

Question

Phloem exudates mainly contain:

Easy

A

Both reducing sugars like glucose and fructose in more amounts and non-reducing sugar like sucrose in lesser amounts
B

Reducing sugars like glucose only
C

Non-reducing sugars like sucrose which have greater chemical stability
D

Monosaccharide sucrose

Solution

Phloem exudates contain non-reducing sugars like sucrose, raffinose, stachyose, verbascose etc., which have greater chemical stability. Nonreducing sugars are less likely to react with other substances along the way. Indeed, free glucose and fructose, both reducing sugars, are rarely found in phloem exudates.

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