Test 13: XIth-18 ChaptersContact Number: 9667591930 / 8527521718Test 13: XIth-18 ChaptersContact Number: 9667591930 / 8527521718The depolarization of the axonal membrane is due to:
1. Influx of sodium ions
2. Efflux of sodium ions
3. Influx of potassium ions
4. Efflux of the potassium ions
When proteins are used as respiratory substrates, the respiratory quotient would be about:
1. 1.2
2. 1.0
3. 0.9
4. 0.7
At the root apex the cells of the meristematic region are not characterized by:-
1. Being rich in protoplasm
2. Abundant plasmodesmatal connections
3. A cell wall that is primary in nature
4. Having small inconspicuous nuclei
Crops such as tomatoes and bell pepper, allowed to grow in a carbon dioxide rich environment, show higher yields because:
| 1. | They show an increased rate of photosynthesis at higher carbon dioxide concentrations. |
| 2. | They can respond to high carbon dioxide conditions even in low light conditions. |
| 3. | They show C4 pathway for carbon fixation at high carbon dioxide is the limiting factor in such plants. |
| 4. | Only carbon dioxide is the limiting factor in such plants. |
At about what percentage of the full sunlight does light saturation occurs in photosynthesis?
1. 10
2. 25
3. 70
4. 95
Which of the following alkali metal ion in aqueous solution is the best conductor of electricity?
(1) Li+
(2) Na+
(3) Cs+
(4) K+
What is the decreasing order of stability of the carbocation ions?
1. I>II>III
2. II>III>I
3. III>I>II
4. II>I>III
Does the root-mean-square speed of the molecules of an enclosed gas is v? What will be the root-mean-square speed if the pressure is doubled, the temperature remaining the same?
1. v/2
2. v
3. 2v
4. 4v
When a sound wave travels from one medium to another, the quantity that remains unchanged is :
1. speed
2. amplitude
3. frequency
4. wavelength