Biology

Plant Transport and Physiology

1,834 Questions

Access a comprehensive set of questions on plant transport mechanisms and physiological adaptations. Topics include water movement, translocation of food, and plant responses to external stimuli. These biology questions are essential for medical entrance exams and other science competitive tests.

Xylem and phloem transportTranspiration and evaporationPlant adaptationsGeotropic and phototropic responsesWater absorption by rootsRespiration in roots

Plant Transport and Physiology Questions

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

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

  1. Transpiration

  2. Guttation

  3. Evapo-transpiration

  4. Evaporation
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, such as grasses. It is the loss of water in liquid form through hydathodes.

Therefore, the correct answer is option B.

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

Loss of water from the tip of the leaf pores in a plant is known as 

  1. Transpiration.

  2. Guttation.

  3. Evaporation.

  4. Respiration.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The soil rich in moisture content, water floods a plant root system. Leaves can retain only a finite amount of water. Excess water i.e xylem sap is given out from the roots through pores or edge of leaves and this process is called guttation. Thus the correct answer is option B.

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

Transpiration occurs through .......... and guttation occurs through .......... in the plants.

  1. Hydathodes, stomata

  2. Stomata, cuticle

  3. Stomata, hydathodes

  4. Hydathodes, lenticles
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Transpiration is the process in which water vapors are released from the stomata. Guttation is the process of release of water droplets from the hydathodes.

So, the correct answer is 'Stomata, hydathodes'.

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

Guttation is caused due to

  1. Imbibition

  2. Osmosis

  3. Positive root pressure

  4. Transpiration
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Guttation is the 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 continuous excretion of watery substance from stump of a well watered pot plant after cutting off the shoot slightly above the base is due to

  1. Root pressure

  2. Guttation

  3. Transpiration

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

Root pressure is osmotic pressure within the cells of a root system. Root pressure is generated by active uptake of minerals by roots, which lowers water potential of root cells and water flows inside the cells along its concentration gradient. Thus, on the cutting of shoot, excretion of watery substance from cut side occurs.

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

The loss of water in the form of water drops is known as

  1. Transpiration

  2. Respiration

  3. Guttation

  4. Exomosis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Transpiration is the process where plants absorb water through the roots and then give off water vapor through pores in their leaves.

Respiration  is a process in which living organisms produces energy, with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances.
Guttation is the loss of water in the form of water droplets from hydathodes (small pores) on the leaf margin of a plant.
The passage of material through a semi-permeable membrane from a region of higher to a region of lower concentration, especially the passage of water through a cell membrane into the surrounding medium, is called exosmosis. 
Thus, the correct answer is option (C).

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

Guttation is from

  1. Uninjured edges of leaves near vein endings

  2. Epidermal layers of leaf surface

  3. Injured edges of leaves

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

Guttation is the loss of water in the form of liquid from the uninjured margins of the leaves is called guttation. The pores are known as hydathodes. The level of soil moisture is high which creates greater root pressure. This root pressure creates a force which allows exudation of water from the tips. It is favored when the transpiration is suppressed and the relative humidity is high
Thus the correct answer is option (A). 

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

Water exudation through hydathodes is 

  1. Guttation

  2. Transpiration

  3. Hydrolysis

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

Water exduation through hydathodes is known as guttation. Guttation is the process of loss of impure water (a dilute solution of different organic and inorganic substances) 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 hydrathodes. Each hydrathode is made up of group of loosely arranged achlorophyllous or colorless and parenchymatous cells called epithem. These cells help in absorbing a good percentage of inorganic and organic solutes present in the exudate. 

So, the correct answer is option A.

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

Guttation occurs in well-watered herbaceous plants of well-drained soils during

  1. Evening

  2. Morning

  3. Day

  4. Noon
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Guttation is the moisture emitted by plants during night time.

Mainly it is caused by due to root pressure. At night time in absence of transpiration water will get accumulated in roots and it will cause root pressure due to high soil moisture level. in this condition, plants emit water in form of droplets it is called as guttation. So droplets are emitted during morning time in well-watered herbaceous plants of well-drained soil.
So the correct answer is 'Morning'.

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

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

  1. Low transpiration

  2. Excessive absorption

  3. Excessive transpiration

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

Guttation is due to 

  1. Negative root pressure

  2. Positive root pressure

  3. Transpiration

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

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

Guttation occurs when

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

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

Process of water exudation from hydathodes is known as

  1. Guttation

  2. Transpiration

  3. Evaporation

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

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

  1. Guttation

  2. Exudation

  3. Oozing

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

Guttation is the process of water droplet release through hydathodes (specialized pores) in intact plants, typically occurring when transpiration is low and root pressure is high. This happens at night or early morning. Option B is the general term but guttation is more specific for intact plants.

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

Loss of water from tip of leaves is called 

  1. Guttation

  2. Transpiration

  3. Evaporation

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