NEET · BiologyHard
Which of the following best explains why the symplastic pathway is considered more selective than the apoplastic pathway for mineral uptake in roots?
- A.The apoplastic pathway is faster due to lack of membrane resistance
- B.The symplastic pathway involves crossing the plasma membrane, allowing selective transport via proteins
- C.The apoplastic pathway is blocked by the Casparian strip in the endodermis
- D.The symplastic pathway relies on passive diffusion through plasmodesmata
Show correct answer & step-by-step solution
Correct answer: B — The symplastic pathway involves crossing the plasma membrane, allowing selective transport via proteins
Solution
- The apoplastic pathway involves movement through cell walls and intercellular spaces.
- The symplastic pathway involves movement through the cytoplasm connected by plasmodesmata.
- To enter the symplast, solutes must cross the plasma membrane.
- Membrane transport proteins regulate the entry of specific ions, providing selectivity.
- Hence the answer is (B).
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