Potometer works on the principle of:
1. | Potential difference between the tip of the tube and that of the plant |
2. | Amount of water absorbed equals the amount that transpired |
3. | Osmotic pressure |
4. | Root pressure |
The ability of the Venus Flytrap to capture insects is due to:
1. | Rapid turgor pressure changes |
2. | A passive process requiring no special ability on the part of the plant |
3. | Specialized "muscle-like" cells |
4. | Chemical stimulation by the prey |
Osmotic potential and water potential of pure water are respectively:
1. 0 and 0
2. 0 and 1
3. 100 and 0
4. 100 and 100
A cell 'A' with D.P.D. = 8 is surrounded by three cells 'B', 'C' and 'D' with D.P.D. respectively 4, 6 and 5. What shall be the direction of water movement?
1.
2. A → B → C → D
3. D → C → B ← A
4. A → B ← C → D
When a freshwater protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will:
1. Disappear
2. Increase in size
3. Decrease in size
4. Increase in number
What shall be the water potential of a root hair cell absorbing water from the soil?
1. Zero
2. Less than zero
3. More than zero
4. Infinite
Casparian bands are found in:
1. | Endodermis | 2. | Pericycle |
3. | Periderm | 4. | Cortex |
The movement of ions against the concentration gradient will be:
1. Active transport | 2. Osmosis |
3. Diffusion | 4. All of the above |
Opening and closing of stomata are due to the:
1. Hormonal change in guard cells
2. Change in Turgor pressure of guard cells
3. Gaseous exchange
4. Respiration
Stomata of a plant open due to:
1. Influx of potassium ions
2. Efflux of potassium ions
3. Influx of hydrogen ions
4. Influx of calcium ions