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:
 

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. $B\to A\leftarrow C$
$$ $$ $$ $$ $$ $$ $$ $\uparrow$
$$ $$ $$ $$ $$ $$ $$ $D$
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:

The movement of ions against the concentration gradient will be:

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