Which of the following is not observed during apoplastic pathway ?
(1) Apoplast is continuous and do

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Question

Which of the following is not observed during apoplastic pathway ?
(1) Apoplast is continuous and does not provide any barrier to water movement
(2) Movement of water occurs through intercellular spaces and wall of the cells
(3) The movement does not involve crossing of cell membrane
(4) The movement is aided by cytoplasmic streaming

Accepted Answer

Correct Answer: D — The movement is aided by cytoplasmic streamingStep-by-step Solution:The apoplastic pathway involves movement of water through the non-living parts of the plant — cell walls and intercellular spaces — without crossing any cell membrane. This pathway is entirely passive and is driven by transpiration pull (tension created in xylem). Cytoplasmic streaming (cyclosis) is the active movement of cytoplasm within living cells and is a feature of the symplastic pathway, not the apoplastic pathway.Why other options are wrong:Option A is a correct feature: the apoplast (cell walls + intercellular spaces) forms a continuous system offering minimal resistance to water movement.Option B is a correct feature: water moves through intercellular spaces and cell walls in this pathway.Option C is a correct feature: no membrane crossing occurs in the apoplastic route.Key Concept: Apoplastic pathway — water moves through cell walls and intercellular spaces without entering the cytoplasm; it is a passive process driven by transpiration pull. Symplastic pathway — water moves through plasmodesmata and cytoplasm; cytoplasmic streaming aids this movement.

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