Tag: transpiration

Questions Related to transpiration

Loss or excretion of water in the form of liquid droplets from the margins and tips of leaves is called

botany transpiration guttation excretion in plants long distance transport of water

  1. Transpiration

  2. Guttation

  3. Bleeding

  4. Precipitation

Show answer
Correct Option: B
Explanation:
The loss or excretion of water in the form of liquid droplets from the leaves and other parts of uninjured or intact plant is called guttation. It was first studied by Bergerstein in 18871887. All plants do not show guttation. It is restricted to about 345345 genera of herbaceous and some woody plants. Common examples are garden nasturtium, oat and other cereals, balsam, tomato, cucurbits, Guttation takes place through special structures called hydathodes. They are usually found on the margins and tips of the leaves.
So, the correct answer is 'Guttation'.

Stomata : Transpiration : : Hydathode : ___________.

botany transpiration guttation excretion in plants long distance transport of water

  1. Guttation

  2. Root pressure

  3. Bleeding

  4. Oozing

Show answer
Correct Option: A
Explanation:
The process of exudation of liquid drops from the edges of leaves is called guttation. Usually it occurs through stomata-like pores called hydathodes. It is this process by which fully turgid plant remove extra water. The cause of guttation is mainly root pressure(when the root pressure is high and rate of transpiration is low, guttation takes place). Hydathodes are stomata-like pores, generally present at the tips or margins of leaves of those plants that grow in moist shady places(e.g., Tropaeolum). So, the correct answer is 'Guttation'.

The process of guttation takes place

botany transpiration guttation excretion in plants long distance transport of water

  1. When the root pressure is high and the rate of transpiration is low

  2. When the root pressure is low and the rate of transpiration is high

  3. When the root pressure equals the rate of transpiration

  4. When the root pressure as well as rate of transpiration are high

Show answer
Correct Option: A
Explanation:
The process of exudation of liquid drops from the edges of leaves is called guttation. Usually it occurs through stomata-like pores called hydathodes. It is this process by which fully turgid plants remove extra water. The cause of guttation is mainly root pressure(when the root pressure is high and rate of transpiration is low, guttation takes place). Hydathodes are stomata like pores generally present at the tips or margins of leaves of those plants that grow in most shady places (e.g) Tropaeolum).
So, the correct answer is 'When the root pressure is high and the rate of transpiration is low'.

Match column I with column II and select the correct option from the codes given.


Column I Column II
A. Vein ending (i) Transpiration
B. Necessary evil (ii) Osmosis
C. Semi-permeable membrane (iii) Transpiration pull
D. Cohesion (iv) Guttation
E. Stomata closure (v) ABA

botany transpiration guttation excretion in plants long distance transport of water

  1. A-(iv), B-(i), C-(iii), D-(ii), E-(v)

  2. A-(iv), B-(i), C-(ii), D-(iii), E-(v)

  3. A-(iii), B-(v), C-(i), D-(ii), E-(iv)

  4. A-(i), B-(ii), C-(iii), D-(iv), E-(v)

Show answer
Correct Option: B
Explanation:

(A) Vein ending - Guttation

(B) Necessary evil - Transpiration
(C) Semi-permeable membrane - Osmosis
(D) Cohesion - Transpiration pull
(E) Stomata closure - ABA
So, the correct answer is (b).

In herbaceous plants 'guttation' takes place by 

botany transpiration guttation excretion in plants long distance transport of water

  1. Stomata

  2. Hydathodes

  3. Root hair

  4. Flowers

Show answer
Correct Option: B
Explanation:

Guttation is the process of loss of water from the surface of leaves in the form of water droplets. The margins of leaves contain opening called as hydathodes from where the guttation takes place.

So, the correct answer is 'Hydathodes'.

Which one of the following is responsible for guttation?

botany transpiration guttation excretion in plants long distance transport of water

  1. Root pressure

  2. Transpiration

  3. Photosynthesis

  4. Osmosis

Show answer
Correct Option: A
Explanation:

Guttation is the excretion of drops of xylem sap on the tips or edges of leaves of some vascular plants, such as grasses. In the absence of light, plant loose excess water in the form of liquid through hydathodes because most plants have their stomata closed at night. When there is a high soil moisture level, water will enter plant roots, because the water potential of the roots is lower than in the soil solution. The water will accumulate in the plant, creating a slight root pressure. The root pressure forces some water to exude through special leaf tip or edge structures, hydathodes or water glands, forming drops. Therefore, the correct answer is option A.

Which one is true about guttation?

botany transpiration guttation excretion in plants long distance transport of water

  1. It occurs through specialised pores called hydathodes.

  2. It occurs in herbaceous plants when root pressure is low and transpiration is high.

  3. It only occurs during the day time.

  4. It occurs in plants growing under conditions of low soil moisture and high humidity.

Show answer
Correct Option: A
Explanation:

Guttation is the term used to refer to the phenomenon in which droplets of eater secreted from the pores in leaves of plants. It occurs through specialised pores called hydathodes. It takes place at night and in conditions of high root pressure and low transpiration. It occurs in plants growing under conditions of high soil moisture and high humidity. Thus, the correct answer is 'It occurs through specialised pores called hydathodes.'

The process of the escape of liquid from the tip of uninjured leaf is called as

botany transpiration guttation excretion in plants long distance transport of water

  1. Evaporation

  2. Transpiration

  3. Guttation

  4. None of the above

Show answer
Correct Option: C
Explanation:

Guttation is loss of water in liquid form as a dilute solution from uninjured leaf tips. The uninjured leaf tips have hydathodes or water stomata. Under conditions of low transpiration dilute solution of minerals oozes out through them under the influence of increased root pressure.

The presence of fluid on the edges of leaves in early morning is due to

botany transpiration guttation excretion in plants long distance transport of water

  1. Transpiration

  2. Guttation

  3. Exudation of water

  4. Condensation of moisture

Show answer
Correct Option: B
Explanation:

Guttation is the excretion of drops of xylem sap on the tips or edges of leaves of some vascular plants through hydathode, such as grasses. It occurs in the absence of light i.e., at night and thus it is present on the edge of leaves in the early morning.

So, the correct answer is option B.

Which of the following is not a controlled process?

botany transpiration guttation excretion in plants long distance transport of water

  1. Transpiration

  2. Guttation

  3. Both A and B

  4. None of the above

Show answer
Correct Option: B
Explanation:

Transpiration is the loss of water through stomata in vapour form. Transpiration is regulated through guard cells. Guttation is the loss of water in liquid form through hydathodes. Hydathodes are free ends of vascular supply of leaves. Hydathodes are always open and not regulated by any cells.