Factors affecting transpiration

Transpiration is the loss of ……………………….from the …………………… of plants

• water, stem
• water, leaves
• water vapour, leaves

Which of the following is not capable of speeding up the rate of transpiration in plants?

• increase in sunlight intensity
• increase in atmospheric carbondioxide
• increase in leaf temperature
• increase in wind speed

the thicker the waxy cuticle on the surface of a leaf, ……………………………….

• the faster the rate of transpiration
• the slower the rate of transpiration

plants with large leaves will transpire faster than plants with smaller leaves. Which of the following explains why?

• plant with large leaves carry more water
• plants with large leaves have more stomata in their lower surface
• plants with large leaves have more stomata per unit area
• plants with large leaves blow readily in the wind

which of the following can cause the stomatal aperture to increase in diameter?

• increase in wind speed
• increase in transpiration pull
• increase in light intensity
• increase in ABA secretion

Increased environmental temperature results in increased rate of transpiration because of ………………..

• increased kinetic energy of the water molecules in the leaf xylem
• increased evaporation of water from the substomatal air spaces
• increased diffusion of water vapour from the surfaces of the mesophyl cells
• increased evaporation of water from the surfaces of the mesophyl cells

Under which of the following conditions will the plant stomata shut?

• high relative humidity
• high proportion of atmospheric carbon dioxide
• high light intensity
• high levels of hormone alsisic acid

Which of the following best explains why the rate of transpiration eventually became constant?

• the water in the plant got exhausted

• the stomata closed up

• the rate at which water was getting to the leaves became a limiting factor

• the stomata had become fully saturated

Which of the following statement is true about plant B?

• at high temperature, the flow rate through the xylem will be higher in plant A compared to plant B

• at any given temperature, plant A will lose a greater amount of water per time compared to plant B

• at any given temperature, plant B will lose the same amount of water per time as plant A

• the maximum rate of transpiration in plant A is the same as that of plant B

the atmospheric humidity in farm A is 35%, while that in in farm B is 45%. Which of the following statements is true

• Farm B will experience a higher rate of transpiration because of the higher water vapour gradient across the leaf surface
• Farm A plants will experience higher rate of transpiration because of the higher water vapor gradient across the plant leaves
• Farm B will experience higher rate of transpiration because more of the stomata there will be open
• Farm A will experience lowerer rate of transpiration because of the reduced thickness of the plants' waxy cuticle