Phenyl mercuric acetate (PMA) results in

1. reduced photosynthesis

2. reduced transpiration

3. reduced respiration

4. killing of plants.

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Pressure on a plant cell wall caused osmotic movement of water is called:

1. Osmotic pressure

2. Osmotic potential

3. Turgor pressure

4. Hypertonic pressure

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The pericycle, which gives rise to lateral roots, consists of:

1. Epithelial cells

2. Meristematic cells

3. Parenchymal cells

4. Endodermal cells

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The most abundant solute in the phloem sap is :
1. Potassium ions
2. Sucrose
3. Glucose
4. Starch

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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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