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NEET UG BIOLOGY MCQ: TRANSPORT IN PLANTS
1
Medium
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Understanding
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Consider the following statements and choose the correct option from codes given below
I. Loading of phloem is related to increase of sugar in phloem
II. Active loading of sugar in sieve tube of phloem is driven by proton pump
III. Pressure may be positive or negative in sieve tube cells
IV. Water and solutes move through the sieve tube against pressure gradient
V. Cytoplasmic strand passes through the holes in sieve plates and form continuous filaments
I. Loading of phloem is related to increase of sugar in phloem
II. Active loading of sugar in sieve tube of phloem is driven by proton pump
III. Pressure may be positive or negative in sieve tube cells
IV. Water and solutes move through the sieve tube against pressure gradient
V. Cytoplasmic strand passes through the holes in sieve plates and form continuous filaments
View answer and explanation
Correct option: B
III and IV are incorrect while I, II and V are correct
Option B (III and IV are incorrect while I, II and V are correct) is correct because loading of phloem increases sugar, active loading uses a proton pump, pressure in sieve tubes is positive, water and solutes move down the pressure gradient, and cytoplasmic strands pass through sieve plates.
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Study the following statement and choose the correct option(s) from the codes from below
I. Root pressure provides a light push in the overall process of water transport
II. Root pressure causes the flow of water faster through xylem than it can be lost by transportation
III. In symplast pathway, water move exclusively through the cell wall and intercellular spaces
IV. Guttation is a cause of transpiration pull
V. Most plants fulfill their water requirement by transpiration pull Rate of imbibition is more in?
I. Root pressure provides a light push in the overall process of water transport
II. Root pressure causes the flow of water faster through xylem than it can be lost by transportation
III. In symplast pathway, water move exclusively through the cell wall and intercellular spaces
IV. Guttation is a cause of transpiration pull
V. Most plants fulfill their water requirement by transpiration pull Rate of imbibition is more in?