NEET 2006 Biology question

Biology Transport in Plants NEET 2006

Not in NEET syllabus

The translocation of organic solutes in sieve tube members is supported by-

(1)Root pressure and transpiration pull
(2)P-proteins
(3)Mass flow involving a carrier and ATPCorrect
(4)Cytoplasmic streaming

Answer: (3)

Solution

Organic solutes (mainly sucrose) are translocated through the phloem sieve tubes from source to sink by the pressure flow (mass flow) hypothesis of Munch: sucrose is loaded actively into sieve tubes using carriers and ATP, water enters by osmosis, and the turgor pressure

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Question ID VK-089721