Question contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason).Question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
Statement 1 :Wilting occurs due to loss in turgidity.
Statement 2 : Turgor pressure checks the excessive entry of water into cells.
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Solution
Flowers, young stems and other softer organs are able to maintain their form due to turgidity or TP (turgor pressure). In case of loss of turgidity, the shoots droopdown and the leaves show wilting. Turgor pressure(pressure potential or hydrostatic pressure) keeps a check on the excessive entry of water into cells
Question contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason).Question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
Statement 1: Water potential is new term for diffusion pressure deficit.
Statement 2 :Both diffusion pressure deficit and waterpotential have a negative value.
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Solution
The reduction in the diffusion pressure of water in a solution over its pure state is called diffusion pressure deficit or DPD. It is a term coined by Meyer (1938). It has positive value.Water potential is a modern term coined by Slatyer and Taylor (1960) which is equivalent to DPD, but it has a negative value.
Which of the following statements are correct regarding facilitated diffusion?
(1)It is a very specific process.
(2)It is a passive process.
(3)It helps the substances, hydrophilic in nature, to be transported across the membrane
(4)It is faster than active process.
Identify the factors which affecting the rate of diffusion.
(1)Gradient of concentration
(2)Permeability of the membrane
(3)Temperature
(4)Pressure
(5)Size of diffusing material
Consider the following statements
(1)In active transport, pumps are proteins that use energy for transportation of molecules against the concentration gradient.
(2)Carrier protein is very specific.
(3)Transport rate reaches a maximum when all the active protein transporters are used and saturated.
Which of the following statement(s) is /are correct?
(1)Root pressure provides a tight push in the overall process of water transport.
(2)Most plants meet their water need by transpiration pull.
(3)The greatest of root pressure may be to re-establish the continuous chains of water molecules in the xylem vessel which often break under enormous tension created by transpiration.
(4)Guttation is the cause of transpiration pull.
Which of the following statement(s) is/are correct?
(1)Transpiration and gaseous exchange occur through stomata.
(2)Cell wall of guard cells are homogenous in nature.(3)Guard cells are regular in shape.
(4)Cellulosic microfibrils are longitudinally oriented in guard cells.
Match Column I with Column II
| Column I | Column II |
|---|---|
| A.Diffusion | 1.Hydrophilic substances |
| B.Osmosis | 2.Shrinkage of protoplasm |
| C.Imbibition | 3.Semipermeable membrane |
| D.Plasmolysis | 4.Free movement of ions and gases |
Match Column I with Column II
| Column I | Column II |
|---|---|
| A.Relay Pump Theory | 1.Stocking |
| B.Transpiration Cohesion Theory | 2.Sir J. C. Bose |
| C.Mass Flow Theory | 3.Godlewski |
| D.Pulsation Theory | 4.Dixon and Jolly |
| 5.Ernest Munch |
Match Column I with Column II
| Column I | Column II |
|---|---|
| A.Transpiration | 1.Uses energy to pump molecules against a concentration gradient |
| B.Guttation | 2.Active absorption of water |
| C.Exudation | 3.Loss of water vapour from plant parts |
| D.Active transport | 4.Loss of liquid water from leaves. |
| 5.Loss of water from injured plant parts. |