Stomatal movement is not affected by

1. Temperature
2. Light
3. O2 concentration
4. CO2 concentration

Subtopic:  Stomata: 2 |
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The water potential of pure water is

(1) zero

(2) less than zero

(3) more than zero, but less than one

(4) more than one

Subtopic:  Plant Water Relations: Water Potential: 2 | Plant Water Relations: Reverse Osmosis & Water potential: 1 | Plant Water Relations: Reverse Osmosis & Water Potential |
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Which of the following facilitates opening of stomatal aperture :-

(1) Contraction of outer wall of guard cells

(2) Decrease in turgidity of guard cells

(3) Radial orientation of cellulose microfibrils in the cell wall of guard cells

(4) Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

Subtopic:  Stomata: 3 | Stomata |
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Which of the following facilitates opening of stomatal aperture?

1. Decrease in turgidity of guard cells

2. Radial orientation of cellulose microfibrils in the cell wall of guard cells

3. Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

4. Contraction of outer wall of guard cells

Subtopic:  Stomata: 3 | Stomata |
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The water potential of pure water is:

1. Less than zero

2. More than zero but less than one

3. More than one

4. Zero

Subtopic:  Plant Water Relations: Water Potential: DPD |
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A 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

Subtopic:  Ascent of Sap |
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Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening, carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using the following options.
1. Both processes can happen together because the diffusion coefficient of water and CO2 is different
2. The above processes happen only during night time.
3. One process occurs happen only day time and the other at night
4. Both process cannot happen simulataneously
Subtopic:  Transpiration & Guttation |
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