Free Printable Factors affecting transpiration

Worksheets

Factors affecting transpiration

Total questions: 21

Worksheet time: 11mins

Name

Class

Date

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

10.

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

11.

Increase in wind speed will not increase the rate of stomatal transpiration in which of the following situations?

all plants in night time

plants whose stomata have closed

plants with needle like leaves

plants with sunken stomata

12.

ABA is an ……………………..that will be secreted when ……………………………….

enzyme, environmental temperature is extremely high

hormone, wind speed is reducing

hormone, environmental temperature is high

enzyme, light intensity is extremely high

13.

Increase in wind speed results in increased rate of transpiration because

increased wind speed helps to maintain high water vapour gradient across stomatal opening

increased wind speed helps to keep the leaves moving, leading to increased evaporation of water

increased wind speed increase the rate of photosynthesis

increased wind speed increases the rate of stomatal opening

14.

Which one of the following is the best thing a farmer can do to minimise water loss by transpiration?

grow his plants in the dark

grow his plants in a glass house with moderated temperature

expose his plants to moist air

use adequate amount of fertilizer on his farm

15.

Which of the following statement is NOT a valid conclusion from the graph/

the stomatal transpiration rate in moving air is always higher than in still air

at stomatal diameter of 10Um and above, the rate of stomatal transpiration ceases to increase in still air

moving air casues stomatal diameter to increase more compared to still air

environmental factors such as wind speed have more amplified effect on transpiration rate than intrinsic factors such as stomatal diameter

16.

What causes the stomata to open?

so that transpiration can occur

so that photosynthesis can occur

so that chloroplast can trap light energy

so that absisic acid can be produced

17.

High light intensity favours high rate of transpiration because ……………………..

high light intensity favour high rate of evaporation

high light intensity favours high rate of diffusion

high light intensity favours high rate of photosynthesis

high light intensity favours high rate of chlorophyl activation

18.

Which of the following conditions will favour a most reduced rate of transpiration?

reduced environmental temperature and high light intensity

increased environmental temperature and reduced wind speed

increased relative humidity and reduced wind speed

reduced relative humidity and increased wind speed

19.

Which plant will have the highest rate of transpiration and why?

plant B, because of larger amounts of stomata per unit area of leaf

plant A because of wider stomatal aperture

plant C because of more orderly stomatal arrangement

plant D because of large stomatal size

20.

large amounts of stomata on the lower surface of leaves rather than upper surface will result in ……………………..

high rate of transpiration

low rate of transpiration

irregular rate of transpiration

high rate of transpiration at night

21.

High temperature will have little or zero effect on the rate of transpiration if …………………..

atmospheric humidity of the surrounding air is greater than that in the leaf

ABA is not being released by the plant

there is sufficient water available within the soil

light intensity is just normal

100 %

Factors affecting transpiration

Total questions: 21

Worksheet time: 11mins

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