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. Semilunar b. dump - bell c. Kidney shaped
d. Semilunar/dump-ball/kidneyshaped e. None of the above
3. The mineral engaged in stomatal movement
a. Calcium b. Iron c. Pottassium 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 putward 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. None 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. Doesnot 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.