Top 150+ Solved Transport in Plants MCQ Questions Answer
Q. Scotoactive movement of stomata is that
a. Stomata open at night
b. Stomata open during day
c. Stomata close at night
d. Stomata open both during day and night
Q. During high wind velocity, the stomata
a. open more widely
b. Close down
c. Remian unaffected
d. Remain unaffected but lose more water due to mass action
Q. Cobalt chloride is blue in dry state. In contact with moisture, it turns in to
a. Yellow
b. Pink
c. Red
d. Green
Q. The maximum absorption of water by roots occurs in the (region) zone of
a. Root cap
b. Cell division
c. Cell elongation
d. Root hairs
Q. The movement of water is along
a. Turgor gradien
b. DPD gradient
c. Diffusion gradient
d. Osmotic gradient
Q. As absorbed water passes towards vascular cylinder, it must enter the cytoplasm of
a. Pericycle cell
b. Endodermal cells
c. Cortical cells
d. Xylem parenchyma
Q. Water tightly held to soil particles is called (EAMCET 1996)
a. Bound water
b. Capillary water
c. Hygroscopic water
d. Runaway water
Q. The phenomenon which forces water upward into tracheal elements of xylem in the root region is
a. Transpiration
b. Root pressure
c. Turgor pressure
d. Imbibation pressure
Q. The phenomenon related to active water absorption is
a. Transpiration
b. Root pressure
c. Osmotic pressure
d. Translocation
Q. Root pressure can be demonstrated by means of
a. wilting
b. Guttation
c. Transpiration
d. Exudation
Q. Root pressure theory of ascent of sap is unacceptable because
a. Water can ascend without root or root pressure
b. Root pressure cannot explain ascent of sap beyond 10 metres.
c. Root pressure is more during early morning than afternoon.
d. Root pressur does not occur in spring.
Q. Transpiration cohesion theory explains that the upwards pull of water is transmitted from top to bottom by cohesion of molecules caused by
a. Hydrophilic cell wall
b. Hydrogen bonds
c. Oxygen bonds
d. Surface tension
Q. Root pressure is unable to explain the ascent of sap because it is not found in
a. Bryophyte
b. All plants in all reasons
c. Trees
d. Spring