Page 4 - Assignment-Questions-Transport in Plants

E. Long Answer Questions (5 marks each)

21. Minerals are present in the soil in sufficient amount. Do plants need to adjust
the types of solutes that reach the xylem ? Which molecules help to adjust this? How
do plants regulate the type and quantity of solutes that reach xylem?
22. How do plants absorb water? Explain transpiration pull model in this regard.
23. (a) Describe the pressure flow hypothesis of translocation of sugar in plants.
(b) Explain the mechanism of closing and opening of stomata.

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