Substances that enter living cell by facilitated diffusion are

(a) generally polar in nature

(b) transported in the direction of concentration gradient 

(c) transported with the help of carrier proteins 

(d) all of the above

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Transpiration is very important for plants because it helps in 

(a) the absorption of water from soil

(b) the cooling of leaves at high temperature

(c) the movement of water and minerals absorbed by roots to various parts of the plant

(d) all of the above

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Wooden doors swell up and get stuck during the rainy season. This is due to the phenomenon of

(a) imbibition

(b) endosmosis

(c) capillarity

(d) deplasmolysis.

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In plants, water moves from

(a) less negative to more negative potential
(b) more negative to less negative potential
(c) same potentials
(d) none of the above.

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If turgor pressure becomes equal to the wall pressure, then

(a) water leaves the cell

(b) water enters the cell

(c) no exchange of water takes place

(d) solute goes from the cell into water.

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Which of the following helps in ascent of sap?

(a) Root pressure

(b) Transpiration

(c) Capillarity

(d) All of these

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What do A, B, C and D represent in the following figure?

(a) A : carrier protein, B : symport, C : uniport, D : antiport

(b) A : carrier protein, B : uniport, C : antiport, D : symport

(c) A : carrier protein, B : antiport, C : symport, D : uniport

(d) A : carrier protein, B : uniport, C : symport, D : antiport

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What is correct about the movement of substance across the membrane in facilitated diffusion?

(a) It is an active transport.

(b) It cause transport of molecules from low concentration to high concentration.

(c) It is insensitive to inhibitors.

(d) It is a very specific transport.

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In active transport, carrier protiens are used, which use energy in the form of ATP, to

(a) transport molecules against concentration gradient of cell wall.

(b) transport molecules along concentration gradient of cell membrane.

(c) transport molecules against concentration gradient of cell membrane.

(d) transport molecules along concentration gradient of cell wall.

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The water logging capacity of garden soil will be determined by measuring the weight of 

(a) soil by adding water and humus

(b) water saturated soil then heating the soil till it is dry and then measuring the weight of soil

(c) soil by adding water, boimass and humus

(d) soil from different locations with biomass.

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