The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of
1. lignified thick walls
2. cohesion and adhesion
3. weak gravitational pull
4. transpiration pull
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In plants, water moves from
1. less negative to more negative potential
2. more negative to less negative potential
3. a point to another point with the same potential
4. none of the above
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The translocation of organic solutes in sieve tube members is supported by
1. Root pressure and transpiration pull
2. P-proteins
3. Mass flow involving a carrier and ATP
4. Cytoplasmic streaming
Water vapor 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 one of the following options
1. Both processes cannot happen simultaneously
2. Both processes can happen together because the diffusion coefficient of water and CO2 is different
3. The above processes happen only during night time
4. One process occurs during day time and the other at night
Assertion: Increased turgor in guard cells opens stomata.
Reason: Rings of cellulose microfibrils prevent the width of the guard cells from swelling, and only allow the extra turgor pressure to elongate the guard cells.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
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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
Electron transport chain in mitochondria uses the reduction energy of NADH to move protons across the inner mitochondrial membrane against their concentration gradient. This is an example of:
1. Facilitated diffusion
2. Forward osmosis
3. Primary active transport
4. Secondary active transport
Consider the following two statements:
I. The evolution of photosynthesis is probably one of the strategies for maximizing the availability of while minimizing water loss.
II. Plants with photosynthesis close their stomata during day and open them in night.
1. Both I and II are correct
2. I is correct and II is incorrect
3. I is incorrect and II is correct
4. Both I and II are incorrect
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Which of the following will always be a “sink” in a plant?
1. Roots | 2. Fruits |
3. Tubers or bulbs | 4. Leaves |
A cell has less number of aquaporins when compared to another cell in a plant. With respect to the latter cell, the former cell will have:
1. a faster rate of osmosis.
2. a lower water potential.
3. a higher water potential.
4. a lower rate of osmosis.