Transport in plant

 

Q76. Guard cells help in: 

(1) Transpiration 

(2) Guttation 

(3) Fighting against infection 

(4) Protection against grazing

Ans.1

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Q77. The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of 

(1) Transpiration pull 

(2) Lignified thick walls 

(3) Cohesion and adhesion 

(4) Weak gravitational pull

Ans.3

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Q78. Two cells A and B are contiguous Cell A has osmotic pressure 10 atm, turgor pressure-7atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be 

(1) Movement of water of Cell A to B 

(2) Movement of water from Cell B to A 

(3) No movement of water 

(4) Equilibrium between the two

Ans.1

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Q79. 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 ATP 

(4) Cytoplasmic streaming

Ans.3

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Q80. Potometer works on the principle of

(1) Amount of water absorbed equals the amount transpired 

(2) Osmotic pressure 

(3) Root pressure 

(4) Potential difference between the tip of the tube and that of the plant

Ans.1