The water potential of pure water is

(a) zero

(b) less than zero

(c) more than zero, but less than one

(d) more than one

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A few drops of sap were collecled by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?

(a) Acidic
(b) Alkaline
(c) Low refractive index
(d) The absence of sugar

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Root pressure develops due to

(a) active absorption

(b) low osmotic potential in soil

(c) passive absorption

(d) increase in transpiration

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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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