CBSE
Multiple Choice QuestionsSunken stomata are present in
mesophyte
xerophyte
epiphytes
All of these
Most accepted theory for ascent of sap is
capillarity theory
root pressure theory
pulsation theory
transpiration pull theory
The right equation for water potential is
Transpiration differ from evaporation in
rate of water loss
transpiration is a physiological process whereas evaporation is physical process
transpiration is a physical process while evaporation is physiological process
frequency of water loss
A plant cell is placed in a solution whose solute concentration is twice as great as the concentration of the cell cytoplasm. The plasma membrance is selectively permeable, allowing water but not solutes to pass through. What will happen to the cell?
The cell will swell because of endosmosis
The cell will shrivel because of exosmosis
The cell will shrivel because of active transport of water
No change will occur because of hard impervious cell wall present
Match the following columns and choose the correct option from the codes given below
| Column I (Type of Pressure in a cell) | Column II (Characteristics) |
| A. Osmotic pressure | 1. Provide turgidity to cells, tissues and softer organs |
| B. Turgor pressure | 2. Control entry of water into cells |
| C. Wall pressure | 3. Prevents bursting of cells and limits expansion |
| D. Diffusion pressure deficit | 4. Helps in retaining water inside cells |
A - 1; B - 3; C - 2; D - 4
A - 2; B - 4; C - 1; D - 3
A - 3; B - 2; C - 4; D - 1
A - 4; B - 1; C - 3; D - 2
In plants, water supply is due to
osmosis
imbibition
guttation
adhesion force
An antitranspirant is
cobalt chloride
mercury
potassium
phenyl mercuric acetate
Diffusion Pressure Deficit (DPD) is equal to the Osmotic pressure substracted by
Osmotic Pressure (OP)
Turgor Pressure (TP)
Suction Pressure (SP)
Water Potential ()
Read the following statements with respects to rate of transpiration.
I. In dry atmosphere, the relative humidity is low so, the rate of transpiration increases.
II. Slow breeze promotes the rate of transpiration.
III. ABA promotes transpiration.
IV. A high salt concentration in soil water increases transpiration.
Choose the incorrect options.
I and II
II and III
III and IV
I and IV
