Problem 103
Exudation of xylem is due to (a) Passive absorption (b) Root pressure (c) Guttation (d) Presence of transpiration
Problem 104
By what mechanism does water moves through vessels and tracheids of root stem and leaves? (a) Osmotic flow (b) Bulk flow (c) Gravity flow (d) Imbibition
Problem 105
When the cut end of a shoot is placed in a solution of safranin, the presence of dye could be located in (a) Cortex (b) Tracheid elements (c) Phloem (d) Pith
Problem 106
Bulk flow of water occurs through (a) Living cells (b) Cell vacuoles (c) Apparent free spaces (d) Plasmodesmata
Problem 107
The continuity of water column in xylem is maintained due to the (a) Presence of air bubbles (b) Cohesive property of water (c) Evaporation power of water (d) None of these
Problem 108
The chief role of transpiration in plants is to cause (a) Loss of surplus water (b) Cooling of the plant (c) Rapid ascent of sap (d) Rapid rise of minerals
Problem 109
The loss of water in the form of vapour from the aerial plant parts is known as (a) Osmosis (b) Respiration (c) Photosynthesis (d) Transpiration
Problem 110
Guard cells are found in (a) Stomata (b) Root tips (c) Ovary (d) Lenticels
Problem 111
The position and frequency of stomata can be determined by (a) Calculating the loss of water (b) Cobalt chloride paper method (c) Photometer (d) Porometer
Problem 112
In both transpiration and evaporation, water is lost in the form of vapour yet they differ, because (a) Both transpiration and cvaporation are similar but the rate of water loss differs. (b) Frequency of water loss is different in both of them. (c) Transpiration is a physical process and evaporation is a physiological process. (d) Transpiration is a physiological process and cvaporation is a physical process.
