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

Loading of phloem is related to:
1.  Increase of sugar in phloem
2.  Elongation of phloem cell
3.  Separation of phloem parenchyma
4.  Strengthening of phloem fiber