11. Which elements are readily mobilized in plants ?
12. In term of fixing \(CO_2\),\(C_4\) plants are .......... efficient as \(C_3\) plants.
13. When a cell is placed in 0.50M concentrated sugar solution, there is no change in it. So the external solution is called .......... .
14. The pressure that prevails in cell due to number of substances dissolved in cell sap is .......... .
A. Wall pressure
B. Turgor pressure
C. Osmotic pressure
D. Diffusion pressure
Answer : Option C
15. The plasmolysed cells regain turgidity and assume original volume under infuence of hypotonic solution. The process is called
16. An animalcell placed in pure water will
A. Swell up and brust
B. Shrink and die
C. Shrink and undergo plasmolysis
D. Swell up and develop turgidity
Answer : Option A
17. Passage of water across a selectively permeable membrane is
18. In thistle funnel experiment, entry of water into thistle funnel stops after some time automatically due to
A. Diffusion of sugar out of thistle funnel.
B. External and internal solutions become isotonic.
C. Development of hydrostatic pressure in the thistle funnel.
D. Development of hydrostatic pressure in the beaker.
Answer : Option C
19. In plants the process in which loss of water occurs in form of water vapour is
20. Stomatal aperature is surrounded by guard cells and opens when guard cells are