Tag: long distance transport of water

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Multiple choice botany transpiration guttation excretion in plants long distance transport of water

The process of guttation takes place

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice botany transpiration guttation excretion in plants long distance transport of water

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

  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)
Reveal answer Fill a bubble to check yourself
B Correct answer
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).

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

In herbaceous plants 'guttation' takes place by 

  1. Stomata

  2. Hydathodes

  3. Root hair

  4. Flowers
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

Which one of the following is responsible for guttation?

  1. Root pressure

  2. Transpiration

  3. Photosynthesis

  4. Osmosis
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

Which one is true about guttation?

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.'

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

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

  1. Evaporation

  2. Transpiration

  3. Guttation

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

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

  1. Transpiration

  2. Guttation

  3. Exudation of water

  4. Condensation of moisture
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

Which of the following is not a controlled process?

  1. Transpiration

  2. Guttation

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

The process of water exudation through the hydathode is called as

  1. Guttation

  2. Transpiration

  3. Excretion

  4. Hydrolysis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Guttation is the loss of water in  the form of liquid through hydathodes or water stomata. It occurs due to positive root pressure and serves to remove excess water from the plant. As xylem sap is having dissolved minerals, water droplets that ooze out from them contain solution of water and minerals. 

Multiple choice transpiration guttation excretion in plants long distance transport of water

If the absorption is more and transpiration is less then process affected will be

  1. Root pressure

  2. Guttation

  3. Bleeding

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Transpiration is defined as loss of water as gas or vapour from leaves through the stomatal pore. If there is less transpiration due to high atmospheric humidity and the soil is well watered; there will be an increase in root pressure. The increased root pressure leads to oozing out of the solution of minerals from hydathodes (called as guttation) and other openings (called as bleeding). Thus, the correct answer is option D.