WATER RELATIONS (BOTANY)

1. Chresard refers to

a. available water b. Runaway water c. The total water present in soil

d.unavailable water

2. Guard cells are

a. Semi lunar b. dump - bell c. Kidney shaped

d. Semilunar/dump-ball/kidney shaped e. None of the above

3. The mineral engaged in stomatal movement

a. Calcium b. Iron c. Potassium d. All the above e. None of the above

4. Guttation takes place through

a. Hydathodes b. Stomata c. Lenticel d. All the above e. None of the above

5. Which of the following is not an antitranspirant

a. ABA b. PMA c. Aspirin d. Wax e. None of these

6. The water potential of pure water is taken as

a. Zero b. -1 c. +1 d. None of these

7. Cohesion tension theory is put ward by

a. Kramer b. Calvin c. Dixon & Jolly d. Hill e. None of the above

8. The water that is held in the pores of the soil against the force of gravity

a. Gravitational water b. capillary water c. Hygroscopic water

d. Non of these

9. The covering of vacuole is

a. Plasma membrane b. Cell sap c. Vacuoplast d. Tonoplast e. None of these

10. Active absorption

a. Requires energy b. Does not require energy

c. Requires no absorbing structures d. None of these

11. Water potential is represented by

a. Y s b. Y p c. Y w d. Y or Y w e. S

12. Water is absorbed mainly through

a. The roots b. Leaves c. Root hairs d. Stomata

13. Guttated water is

a. Pure b. With dissolved salts c. In vapour form d. Reabsorbed by the

plants

14. The strong affinity of vessels for water is called

a. Cohesion b. Tension c. Adhesion d. Attraction e. Inhibition

15. Rapid transpiration may cause

a. Increased rate of absorption b. wilting c. increased ascent of sap

d. All the above e. None of the above.