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Transpiration (AIPVT)

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Number of Questions: 28
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Tags: transpiration Transpiration
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Alfaalfa type of stomata are present in

  1. onions

  2. radish

  3. pumpkin

  4. moong

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Correct Option: B
Explanation:

Radish have alfaalfa type of stomata. In Radish, stomata are opened throughout the day.

Cauline transpiration takes place from the

  1. leaves

  2. stem

  3. calyx

  4. buds

Show answer
Correct Option: B
Explanation:

Cauline transpiration takes place from the stem.

Most of the transpiration which takes place in plants is called

  1. cuticular transpiration

  2. lenticular transpiration

  3. foliar transpiration

  4. cauline transpiration

Show answer
Correct Option: C
Explanation:

The loss of water which takes place from leaves is called foliar transpiration. Most of the (80-90%) transpiration which takes place in plants is foliar transpiration.

Which of the following factors increases the rate of transpiration?

  1. Darkness

  2. Low temperature

  3. Humid air

  4. Dry air

Show answer
Correct Option: D
Explanation:

Dry air lowers the amount of air moisture and increases the rate of transpiration.

In which of the following plants are stomata open throughout day and night, except for a few hours in the evening?

  1. Bean and pea

  2. Cabbage and pumpkin

  3. Cereals

  4. Onion and mustard

Show answer
Correct Option: B
Explanation:

In cabbage and pumpkin, stomata are open throughout day and night, except for few hours in the evening.

What happens when sugar gets converted to starch in leaves?

  1. Stomata are partially opened.

  2. Stomata are closed.

  3. Stomata are fully opened.

  4. Stomata remain unchanged.

Show answer
Correct Option: B
Explanation:

When sugar gets converted to starch in the leaves, the stomata are closed.

Which of the following enzymes is responsible for closing of stomata?

  1. Phosphoglucomutase

  2. Phosphorylase

  3. Hexokinase

  4. Phosphatase

Show answer
Correct Option: C
Explanation:

Hexokinase converts Glucose to G-1 phosphate, which eventually gets converted to starch. Thus, hexokinase plays an important role in closing of stomata.

Which of the following statements are untrue?

  1. Transpiration is regulated by guard cells.

  2. Transpiration stops when air is fully saturated.

  3. Transpiration is dependent upon absorption of water from the soil.

  4. Transpiration takes place from aerial parts of the plant.

Show answer
Correct Option: B
Explanation:

This is untrue. Transpiration continues for some time even after saturation of outside air.

Lenticular transpiration takes place through

  1. flowers

  2. tendrils

  3. fruits

  4. green stems

Show answer
Correct Option: C
Explanation:

Lenticular transpiration takes place through fruits. This type of transpiration continues day and night because lenticels have no mechanism of closure.

What is the action spectrum of transpiration?

  1. Orange-Red

  2. Blue and Red

  3. Blue and green

  4. Green - UV light

Show answer
Correct Option: B
Explanation:

The action spectrum for the process suggests that both red and blue light are important regulators of guard cell activity and that their action is, at least partially, mediated by photosynthesis.

In guttation, water exits from the plant through

  1. lenticels

  2. hydathodes

  3. stomata

  4. pits

Show answer
Correct Option: B
Explanation:

In guttation, water exits from the plant through special pores on the margin of leaves called hydathodes.

Transpiration is reduced when

  1. atmospheric pressure is lowered

  2. soil contains higher concentration of salts

  3. abundant light is present

  4. atmosphere is less humid

Show answer
Correct Option: B
Explanation:

Higher concentration of salts in soil reduces the absorption rate, thereby, reducing the rate of transpiration.

The inner wall of guard cell is

  1. thicker than the outer wall

  2. thinner than the outer wall

  3. of same thickness as the outer wall

  4. Absent

Show answer
Correct Option: A
Explanation:

The cell walls of guard cells are unevenly thickened. The inner wall is thicker than the outer wall.

Stomata opens wide when

  1. atmosphere outside the stomata is less saturated

  2. secretion of salt molecules by the adjacent guard cells takes place

  3. water molecules enter the guard cells

  4. there is sudden fall of temperature

Show answer
Correct Option: C
Explanation:

Stomata widely opens when water molecules enter the guard cells and becomes turgid.

Who proposed the proton transport method for opening and closing of stomata?

  1. Health and Zelitsh

  2. Levitt

  3. Von Mohl

  4. Lloyd

Show answer
Correct Option: B
Explanation:

Levitt proposed the proton transport method for opening and closing of stomata.

Stomata opens in night and closes during day in

  1. Pine

  2. Water lily

  3. Aloe vera

  4. Clover

Show answer
Correct Option: C
Explanation:

Aloe vera is a succulent and in these plants stomata opens at night and closes during day.

Which of the following hormones is/are produced by plants during water stress that brings stomatal closure?

  1. Auxins

  2. Abscisic acid

  3. Ferulic acid

  4. Resins

Show answer
Correct Option: B
Explanation:

Abscisic acid is produced by plants during water stress, that brings stomatal closure.

'Transpiration is a necessary evil' was promulgated by

  1. Von Mohl

  2. Curtis

  3. Steward

  4. Hanes

Show answer
Correct Option: B
Explanation:

According to Curtis, 'transpiration is a necessary evil'.

Cobalt chloride experiment is used

  1. to demonstrate the process of transpiration

  2. to determine the rate of transpiration

  3. to show that the rate of transpiration from the lower surface of leaf is higher than the upper surface

  4. to demonstrate the phenomenon of osmosis

Show answer
Correct Option: C
Explanation:

Cobalt chloride method is used to show that the rate of transpiration from the lower surface of leaf is higher than the upper surface.

According to Von Mohl,

  1. starch to sugar inter-conversion regulates stomatal opening or closing

  2. osmotic pressure regulates the stomatal opening and closing

  3. opening and closing of stomata takes place by an active transport of K+ ions into the guard cells

  4. transpiration pull regulates stomatal opening or closing

Show answer
Correct Option: B
Explanation:

According to Von Mohl, Osmotic pressure regulates the stomatal opening and closing.

Which of the following is a metabolite anti-transpirant?

  1. Low viscosity waxes

  2. Silicon emulsion

  3. Abscisic acid

  4. Fertilizers in soil

Show answer
Correct Option: C
Explanation:

Abscisic acid is a metabolite anti-transpirant.

What is/are epithem?

  1. Epithem are the kidney shaped cells regulating the opening and closing of stomatal aperture.

  2. Epithem are the epidermal cells surrounding the guard cells.

  3. Epithem are the loose tissues present below hydathodes.

  4. Epithem is the watery sap secreted from injured or cut plant.

Show answer
Correct Option: C
Explanation:

Epithem are the loose tissues present below the hydathodes.

Which of the following phenomenon takes place only at night?

  1. Transpiration

  2. Guttation

  3. Evaporation

  4. Bleeding

Show answer
Correct Option: B
Explanation:

Guttation takes place only at night.

Which phenomenon governs the transpiration in plants?

  1. Gravity

  2. Electrical charges on leaves

  3. Capillary action

  4. All of the above

Show answer
Correct Option: C
Explanation:

Capillary action governs the transpiration in plants.

Plant bleeding refers to

  1. secretion of red liquid from cuts in plant

  2. secretion of watery sap from injured plant

  3. exudation of water in the form of droplets from the margin of leaves

  4. excessive loss of water from the plants leading to water deficit

Show answer
Correct Option: B
Explanation:

Plant bleeding refers to secretion of watery sap from injured plant.

Which enzyme catalyzes the conversion of starch to sugar leading to opening of stomata?

  1. Hexokinase

  2. Phosphatase

  3. Phosphoglucomutase

  4. Phosphorylase

Show answer
Correct Option: D
Explanation:

Phosphorylase catalyzes conversion of starch to sugar in the process of opening the stomata.

Which instrument measures both relative humidity and transpiration?

  1. Porometer

  2. Potometer

  3. Psychrometer

  4. Tensiometer

Show answer
Correct Option: C
Explanation:

Psychrometer is an apparatus to measure both relative humidity and transpiration.

An increase in root/shoot ratio results in

  1. increase in rate of transpiration.

  2. decrease in rate of transpiration

  3. increase in rate of absorption

  4. increase the rate of photosynthesis

Show answer
Correct Option: A
Explanation:

A high root/shoot ratio increase the rate of transpiration.

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