A column of water within xylem vessels of tall trees does not break under its weight because of

(a) dissolved sugars in water

(b) tensile strength of water

(c) lignification of xylem vessels

(d) positive root pressure

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Transpiration and root pressure cause water to rise in plants by

(a) Pulling it upward

(b) pulling and pushing it, respectively

(c) pushing it upward

(d) pushing and pulling it, respectively

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Which of the following criteria does not pertain to facilitated transport?
(a) Requirement of special membrane proteins
(b) High selectivity
(c) Transport saturation
(d) Uphill transport

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Which one of the following elements in plants is not remobilised?

(a) Calcium

(b) Potassium

(c) Sulphur

(d) Phosphorus

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The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of
(a) lignified thick walls
(b) cohesion and adhesion
(c) weak gravitational pull
(d) transpiration pull

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Passage cells are thin-walled cells found in:

(a) endodermis of roots facilitating rapid transport of water from cortex to pericycle
(b) phloem elements that serve as entry points for substances for transport to other plant parts
(c) testa of seeds to enable emergence of growing embryonic axis during seed germination
(d) central region of style through which the pollen tube grows towards the ovary

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Two 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

(a) Movement of water from cell B to A

(b) No movernent of water

(c) Equilibrium between the two

(d) Movement of water from cell A to B

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The translocation of organic solutes in sieve tube members is supported by:
(a) root pressure and transpiration pull
(b) P-proteins
(c) mass flow involving a carrier and ATP
(d) cytoplasmic streaming

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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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