Tag: transpiration

Questions Related to transpiration

Water potential in leaf tissue is 'positive' (near zero) during 

botany transpiration guttation excretion in plants long distance transport of water

  1. Low transpiration

  2. Excessive absorption

  3. Excessive transpiration

  4. Guttation

Show answer
Correct Option: D
Explanation:
Transpiration is the process of evaporation of water from the upper surface of the leaves.
(A)Low transpiration indicates the low level of water evaporated and the water potential is negative.
(B)Excessive absorption indicates the entering of the molecule to bulk phase and the water potential is negative.
(C)Excessive transpiration indicates the high level of water evaporated and the water potential is negative.
(D)Guttation occurs due to root pressure. It is the loss of water through leaves in the absence of photosynthesis. Due to root pressure water moves upwards and at this point, the amount of water is more in leaves than the atmosphere so water potential is positive.
So, the correct answer is 'Guttation'.

Guttation is due to 

botany transpiration guttation excretion in plants long distance transport of water

  1. Negative root pressure

  2. Positive root pressure

  3. Transpiration

  4. None of the above

Show answer
Correct Option: B
Explanation:

Root pressure is the pressure caused due to the accumulation of water in the root region. It is caused in the absence of transpiration so, due to excess water in the plant, it exudes water through leaves in morning time it is called guttation.

So, the correct answer is 'Positive root pressure'.

Guttation occurs when

botany transpiration guttation excretion in plants long distance transport of water

  1. Wind velocity is high

  2. Humidity increases

  3. Root pressure is less and transpiration rate is more.

  4. Root pressure is more and transpiration rate is less.

Show answer
Correct Option: D
Explanation:

Guttation is the process of secretion of the droplet of water from the pores of the plant. It occurs when the root pressure goes high and so the suction force gets increased. Also, when the rate of transpiration, that is the rate of evaporation of water from the leaves goes low, the guttation takes place.

So, the correct answer is 'Root pressure is more and the transpiration rate is less'.

Guttation occurs only in

botany transpiration guttation excretion in plants long distance transport of water

  1. Hydrophytes

  2. Mesophytes

  3. Mangroves

  4. Marshy plants

Show answer
Correct Option: B
Explanation:

Guttation is the process in which plant pores secrete droplets of water.

Guttation occurs in moist conditions.
This commonly occurs in mesophytes at night when transpiration
Is not taking place due to closed stomata.
The extra water content is hence removed by this process and it can be seen on the surface of leaves as water oozes out of the hydathodes 
So the correct answer is 'Mesophytes'.

Process of water exudation from hydathodes is known as

botany transpiration guttation excretion in plants long distance transport of water

  1. Guttation

  2. Transpiration

  3. Evaporation

  4. Bleeding

Show answer
Correct Option: A
Explanation:
Guttation is the process of loss of impure water from plant infact, mostly from margins of leaves. It occurs when transpiration rate is very low as compared to rate of water absorption. Due to this root pressure is developed and water is pushed out through specialized pores at vein endings called hydathodes. Each hydathode is made up of group of loosely arranged achlorophyllous or colourless and parenchymatous cells called epithem. These cells help in absorbing a good percentage of inorganic and organic solutes present in the exudate. Thus guttation is due to the positive pressure in the xylem developed due to the root pressure.
So, the correct answer is option A.

Identify the wrong statement.

botany transpiration guttation excretion in plants long distance transport of water

  1. The degree of decrease of chemical potential of water depends on the concentration of solute.

  2. Bacteria and fungal spores are killed in pickles and jams dues to plasmolysis.

  3. Process of water exudation is called transpiration.

  4. Reverse plasmolysis will occur when flaccid cells are placed in hypotonic solution.

Show answer
Correct Option: C
Explanation:

As the concentration of solute increases, water potential decreases.

Pickles and jams are very concentrated in terms of solute content which leads to severe water loss from bacterial cells and fungal spores.
Water exudation occurs when small droplets of water are released from hydathodes and this process is known as guttation.
When flaccid cells are placed in hypotonic solution then they will absorb a large amount of water and this process is known as Reverse plasmolysis.
So the correct answer is 'Process of water exudation is called transpiration'.

Water lost through the process of guttation is in

botany transpiration guttation excretion in plants long distance transport of water

  1. Liquid form containing dissolved minerals

  2. Liquid form without dissolved minerals

  3. Vapour form with minerals

  4. Vapour form without minerals

Show answer
Correct Option: A
Explanation:

Water lost through guttation is in the form of water droplets which also take minerals along with them. Since it is in liquid form, it can dissolve minerals in too.

It is not in the form of vapours as in the case of transpiration. The vapours flow not take minerals with them.
So the correct answer is 'Liquid form containing dissolved minerals'.

Select the matched ones.
(i) Guttation - Water loss in liquid phase.
(ii) Adhesion - Mutual attraction between water molecules.
(iii) Imbibition - Absorption of water by dry wood.
(iv) Hypotonic solution - Cells shrink.

botany transpiration guttation excretion in plants long distance transport of water

  1. i, ii and iii only

  2. ii and iv only

  3. iii and iv only

  4. i and iii only

Show answer
Correct Option: D
Explanation:

Loss of water in the form of water droplets from the pores of plants is called as guttation. Adhesion is the mutual attraction between unlike molecules that results in the sticking together of those molecules to one another. Imbibition is a type of diffusion in which water is absorbed by solid material like dry wood that results in an increase in volume. When a cell is placed in a hypotonic solution, there is more solute concentration in the cell than in the solution. Water moves from lower concentration of solute (solution) to higher concentration of solute (cell). This results in the swelling of cell. 

Thus, the correct answer is option D.

The process of release of water through and intact plant is called.

botany transpiration guttation excretion in plants long distance transport of water

  1. Guttation

  2. Exudation

  3. Oozing

  4. Leakage

Show answer
Correct Option: A

Loss of water from tip of leaves is called 

botany transpiration guttation excretion in plants long distance transport of water

  1. Guttation

  2. Transpiration

  3. Evaporation

  4. Respiration.

Show answer
Correct Option: A
Explanation:

Transpiration is the process in which water vapours are released from the stomata.

Respiration is a metabolic process in which oxygen is used to break down food and carbon dioxide and energy are released.
Evaporation is the process of conversion of liquid water into water vapour.
Guttation is the process of loss of water droplets from pores known as hydathodes and tips of leaves.
So the correct answer is 'Guttation'.