Water logging or over-watering a plant is dangerous and may kill the plant. Why is this so?
1. Water does not have all the necessary minerals a plant needs to grow.
2. Water neutralizes the pH of the soil.
3. The roots are deprived of oxygen.
4. Water lowers the water potential of the roots.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following is/are essential for imbibitions to take place?
I. Water potential gradient between the absorbent and the liquid imbibed
II. Affinity between the adsorbant and the liquid
1. Only II
2. Only I
3. Both I and II
4. None
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyConsider the following:
I. A decrease in pressure on cell exerted by the wall
II. An increase in water potential of the surroundings
III. The uptake of solutes by the cell
IV. An increase in the tension on the surrounding solution
Which of the above would contribute to the uptake of water by the cell?
1. I, II, III
2. II, III, IV
3. I, II, IV
4. I, III, IV
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhat is true for both symplast and apoplast movement of water in plants?
1. An equal rate of transport
2. Being down a potential gradient
3. Assistance by cytoplasmic streaming
4. Conduction through interconnected protoplasts
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPhenyl mercuric acetate (PMA) results in
1. reduced photosynthesis
2. reduced transpiration
3. reduced respiration
4. killing of plants.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPressure 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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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe most abundant solute in the phloem sap is :
1. Potassium ions
2. Sucrose
3. Glucose
4. Starch
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA plant requires potassium for:
(1) Holding its cells together
(2) Synthesizing chlorophyll
(3) DNA replication
(4) Opening and closing its stomata
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe water potential of pure water is
(1) zero
(2) less than zero
(3) more than zero, but less than one
(4) more than one
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA few drops of sap were collected 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?
(1) Acidic
(2) Alkaline
(3) Low refractive index
(4) The absence of sugar
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology