MCQ

MCQ 11 Mark

Transpiration rate is high, when $……$

A
Atmospheric water is saturated with vapour.
B
Light is very dim.
C
Temperature is low
✓
Atmosphere is dry and temperature is high.

Answer

Correct option: D.

Atmosphere is dry and temperature is high.

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MCQ 21 Mark

Who had said that "transpiration is a necessary evil"?

✓
Curtis
B
Steward
C
Anderson
D
$\text{J.C.}$ Bose

Answer

Correct option: A.

Curtis

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MCQ 31 Mark

Stomata can open in night also in _______________

✓
xerophyte
B
gametophyte
C
hydrophyte
D
none of these

Answer

Correct option: A.

xerophyte

Stomata can open in night also in xerophyte

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MCQ 41 Mark

Transpiration rate is low ____________

A
due to less surface area of leaf
B
benting of leaf
C
By sunken stomata
✓
all of the above

Answer

Correct option: D.

all of the above

Transpiration rate is low all of the above

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MCQ 51 Mark

Transpiration generates __________

✓
Suction force
B
capillary force
C
Imbibitions force
D
atmospheric pressure

Answer

Correct option: A.

Suction force

Transpiration generates suction force

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MCQ 61 Mark

The percentage of cuticular transpiration in plants is _____________

✓
Approximately 10%
B
Approximately 20%
C
Approximately 25%
D
Approximately 30%

Answer

Correct option: A.

Approximately 10%

The percentage of cuticular transpiration in plants is approximately 10%

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MCQ 71 Mark

More water loss in plants is the cause of wilting. This can be checked by ____________

A
Keeping plant in bright light
B
Spraying alcohol on the plant
✓
Layering the bottom with Vaseline
D
Giving more fertilizer to the soil

Answer

Correct option: C.

Layering the bottom with Vaseline

More water loss in plants is the cause of wilting. This can be checked by layering the bottom with vaseline

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MCQ 81 Mark

In herbaceous plants, following percentage of absorbed water comes out __________

A
80
B
60
✓
90
D
40

Answer

Correct option: C.

In herbaceous plants, following percentage of absorbed water comes out 90

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MCQ 91 Mark

The rate of transpiration is determined with the following instrument ____________

✓
Potometer
B
Evaporimeter
C
Atmometer
D
Perimeter

Answer

Correct option: A.

Potometer

The rate of transpiration is determined with the following instrument Potometer

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MCQ 101 Mark

Transpiration is more ____________

A
From the upper surface of leaf.
✓
From the lower surface of leaf.
C
From stem.
D
From upper and lower surface of leaf.

Answer

Correct option: B.

From the lower surface of leaf.

Transpiration is more From the lower surface of leaf

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MCQ 111 Mark

Secretion of sap from apex of non-injured leaf is called ___________

A
Evaporation
✓
guttation
C
evapo-transpiration
D
transpiration

Answer

Correct option: B.

guttation

Secretion of sap from apex of non-injured leaf is calledguttation

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MCQ 121 Mark

Guttation is a mechanism of removal of water from plant by _____________

A
Stomata
✓
hydathodes
C
lenticles
D
wounds

Answer

Correct option: B.

hydathodes

Guttation is a mechanism of removal of water from plant by hydathodes

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MCQ 131 Mark

The cause of wilting is more ___________

A
respiration
B
photosynthesis
C
absorption
✓
transpiration

Answer

Correct option: D.

transpiration

The cause of wilting is more Transpiration

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MCQ 141 Mark

Stomata open during day time because guard cells

✓
Do photosynthesis and synthesis osmotically active.
B
Are of thin walls.
C
Are of bean shape.
D
Help in exchange of gases.

Answer

Correct option: A.

Do photosynthesis and synthesis osmotically active.

Stomata open during day time because guard cells do photosynthesis and synthesis osmotically active

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MCQ 151 Mark

Rate of transpiration is more, when __________

A
High humidity is present in atmosphere.
B
Air may be stopped.
C
Extra water is in sky.
✓
Environmental conditions may dry.

Answer

Correct option: D.

Environmental conditions may dry.

Rate of transpiration is more, when environmental conditions may dry

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MCQ 161 Mark

Which one is responsible for guttation?

A
Diffusion
✓
Root pressure
C
Transpiration
D
Photosynthesis

Answer

Correct option: B.

Root pressure

Root pressure

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MCQ 171 Mark

Complete the following statement by choosing the correct alternative given in the bracket:
Loss of water as droplets through leaves of an intact plant is termed ______.

A
Bleeding
✓
Guttation
C
Transpiration
D
Root pressure

Answer

Correct option: B.

Guttation

Loss of water as droplets through leaves of an intact plant is termed guttation.

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MCQ 181 Mark

Mark the most appropriate answer in the following:
Transpiration pull will be maximum under which of the following conditions?

✓
Open stomata, dry atmosphere and moist soil.
B
Open stomata, high humid atmosphere and well irrigated soil.
C
Open stomata, high humid atmosphere and dry soil.
D
Closed stomata, dry atmosphere and dry soil.

Answer

Correct option: A.

Open stomata, dry atmosphere and moist soil.

open stomata, dry atmosphere and moist soil.

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MCQ 191 Mark

Mark the most appropriate answer in the following:
If the rate of transpiration becomes more than the rate of photosynthesis, plant will ______

A
Continue to live, but will not be able to store food.
B
Be killed instantly.
C
Grow more vigorously because more energy will be available.
✓
Stop growing and gradually die of starvation.

Answer

Correct option: D.

Stop growing and gradually die of starvation.

If the rate of transpiration becomes more than the rate of photosynthesis, plant will stop growing and gradually die of starvation.

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