The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of
1. lignified thick walls
2. cohesion and adhesion
3. weak gravitational pull
4. transpiration pull
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTwo cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure-7
atm 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 from cell B to A
2. No movernent of water
3. Equilibrium between the two
4. Movement of water from cell A to B
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySubstances that enter the living cells by facilitated diffusion are:
1. generally polar in nature
2. transported in the direction of the concentration gradient
3. transported with the help of carrier proteins
4. all of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWooden doors swell up and get stuck during the rainy season. This is due to the
phenomenon of
1. imbibition
2. endosmosis
3. capillarity
4. deplasmolysis.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn plants, water moves from
1. less negative to more negative potential
2. more negative to less negative potential
3. same potentials
4. none of the above.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyStomata opens:
(1) in day time - for gaseous exchange
(2) in day time - no gaseous exchange
(3) in night time only - for gaseous exchange
(4) in night time only - no gaseous exchange
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf turgor pressure becomes equal to the wall pressure, then
1. water leaves the cell
2. water enters the cell
3. no exchange of water takes place
4. solute goes from the cell into water.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following helps in ascent of sap?
(1) Root pressure
(2) Transpiration
(3) Capillarity
(4) All of these
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhat do A, B, C and D represent in the following figure?
(1) A : carrier protein, B : symport, C : uniport, D : antiport
(2) A : carrier protein, B : uniport, C : antiport, D : symport
(3) A : carrier protein, B : antiport, C : symport, D : uniport
(4) A : carrier protein, B : uniport, C : symport, D : antiport
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhat is correct about the movement of substances across the membrane in facilitated diffusion?
1. It is an active transport.
2. It causes the transport of molecules from low concentration to high concentration.
3. It is insensitive to inhibitors.
4. It is a very specific transport.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology