Q. No.In section 11.1.2, NCERT states that a concentration gradient needs to be present in spite of the fact that facilitated diffusion is facilitated by a carrier. Why is it so?
1. These protein carriers have ATPase activity.
2. These protein carriers can not move in the membrane.
3. These protein carriers can not establish concentration gradients.
4. These protein carriers can provide only symport with the use of external energy.
1. These protein carriers have ATPase activity.
2. These protein carriers can not move in the membrane.
3. These protein carriers can not establish concentration gradients.
4. These protein carriers can provide only symport with the use of external energy.
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This is an intext question, section 11.2.3, NCERT. What occupies the space between the cell wall and the shrunken protoplast in a plasmolyzed cell
1. Hypertonic solution
2. Hypotonic solution
3. Air
4. Nothing, a vacuum is created
Consider the following statements with respect to the relationship between osmotic pressure and osmotic potential as explained in section 11.2.2 in NCERT
I. Water moves from regions of higher osmotic pressure to regions of lower pressure
II. Osmotic potential is equivalent to osmotic pressure in concept but opposite in sign
The correct statements are:
1. I only
2. II only
3. Both I and II
4. None
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Refer section 11.1.1 of your NCERT. What peculiarity does NCERT mention regarding diffusion and solids ?
1. It does not occur in solids
2. It is more easily visualized in solids
3. It requires expenditure of external energy and occurs against concentration gradient
4. Diffusion in solids rather than of solids is more likely.
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Which one of the following will not directly affect transpiration?
| 1. Temperature | 2. Light |
| 3. Wind speed | 4. Chlorophyll content of leaves |
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The process of guttation takes place
1. When the root pressure is high and the rate of transpiration is low
2. When the root pressure is low and the rate of transpiration is high
3. When the root pressure equals the rate of transpiration
4. When the root pressure as well as rate of transpiration are high
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When a plant undergoes senescence, the nutrients may be
1. Exported
2. Withdrawn
3. Translocated
4. None of the above
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Mycorrhiza is a symbiotic association of fungus with root system which helps in:
| A. Absorption of water | B. Mineral nutrition |
| C. Translocation | D. Gaseous exchange |
| 1. Only A | 2. Only B |
| 3. Both A and B | 4. Both B and C |
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Based on the figure given below, which of the following statement is not correct?
1. Movement of solvent molecules will take place from chamber A to B
2. Movement of solute will take place from A to B
3. Presence of a semipermeable is a prerequisite for this process to occur
4. The direction and rate of osmosis depends on both the pressure gradient and concentration gradient
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Match the following and choose the correct option:
|
A.Leaves |
i. Anti-transpirant |
|
B.Seed |
ii.Transpiration |
|
C.Roots |
iii.Negative osmotic potential |
|
D. Aspirin |
iv.Imbibition |
|
E.Plasmolyzed cell |
v.Absorption |
Options:
1. A-iii, B-iv, C-i, D-v, E-ii
2. A-ii, B-iv, C-v, D-i, E-iii
3. A-iii, B-ii, C-iv, D-v, E-i
4. A-iii, B-ii, C-i, D-iv, E-v
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