Question 1

रात्रि में या पूर्ण प्रात : काल में घास की पत्तियों के शीर्ष से जल के द्रव अवस्था में निकलने को सुगम बनाने में कौन सी प्रक्रिया उत्तरदायी होती है?

Accepted Answer

मूल दाब धनात्मक हाइड्रोस्टैटिक दाब होता है। यह रात में और सुबह में ट्रेकेरी तत्व में विकसित होता है। मूल दाब जड़ के जाइलम में खनिज पोषक तत्वों के आयनों के सक्रिय वितरण के कारण होता है। वाष्पोत्सर्जन के बिना आयनों को तने में ऊपर ले जाने के लिए, वे जड़ के जाइलम में एकत्रित होते हैं और जल विभव को कम करते हैं। जल तब परासरण के कारण मृदा से जड़ के जाइलम में विसरित होता है।

Question 2

Hydathodes are also called

Accepted Answer

Guttation takes place through special structures called hydathodes. These are also called water stomata.

Question 3

Guttation is mainly due to

Accepted Answer

Guttation refers to the exudation of liquid drops from margins and tips of the leaves through specialized structures called hydathodes. The development of root pressure in a plant leads to positive hydrostatic pressure in xylem sap throughout the plant. Because water conducting xylem elements of a vascular bundle terminate in hydathodes, xylem sap is forced to flow through the hydathodes. Thus in guttation, water is exuded from the leaf.

Question 4

The process by which water is absorbed by solids, like colloids causing them to increase in volume is called as

Accepted Answer

Imbibition is a special type of diffusion. In which water is absorbed by solids or colloids causing them to enormously increase in volume. The classical examples of imbibition are absorption of water by seeds and dry wood.

Question 5

Water lost in guttation is

Accepted Answer

Guttation is the loss of water in solution form through hydathodes. It occurs under the influence of root pressure. When transpiration is low and plant absorbs water from well-watered soil under the influence of root pressure. The excess water oozes out as a dilute solution of minerals and other solutes from dead endings of veins.

Question 6

Wilting in plant occurs due to

Accepted Answer

Wilting is the name of the event when non-woody parts of plants lose their rigidity. It occurs when the rate of loss of water from plants is greater than the absorption of water inside the plant which causes drying of the plant.

Question 7

Guttation is mainly due to

Accepted Answer

The loss of water through water stomata (hydathodes) is called as guttation. Guttation 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 specialised pores at vein endings called hydathodes. Therefore guttation is not due to the activity of hydathodes but due to root pressure.

Question 8

Assertion : Guttation liquid is found on the margins of leaves. Reason : Hydathodes are found on the margins.

Accepted Answer

Guttation drops are restricted to tips or margins of the leaves. Guttation takes place through special structures called hydathodes. They are usually found on the margins and tips of the leaves.

Question 9

Assertion: Guttation is the loss of water in its liquified phases from the leaves. Reason: Guttation takes place at night only.

Accepted Answer

Guttation is the loss or excretion of water in the form of liquid droplets from the leaves and other parts of an uninjured or intact plant. All plants do not show guttation. It is restricted to about 345 genera of herbaceous and some woody plants. Guttation occurs through special structures called hydathodes that are usually found on the margins and tips of the leaves. Common examples are found in garden nasturtium, oat and other cereals, balsam, tomato, cucurbits. Guttation usually occurs during periods of active growth when conditions favour more water absorption and less transpiration. It takes place either at night or early in the morning.

Question 10

The process of guttation takes place

Accepted Answer

The process of loss of water in the form of liquid drops from the edges of leaves or the tips of veins through hydathodes is known as guttation.This process usually happens in herbaceous plants when the humidity is and the root pressure is high and the rate of transpiration is low.

Question 11

What is guttation?

Accepted Answer

The loss of water in the form of liquid from margins of leaves is called guttation

Question 12

Name the pores through which guttation occurs.

Accepted Answer

Hydathodes

Question 13

Loss of liquid water by guttation occurs through

Accepted Answer

Guttation is loss of water in liquid form from uninjured part in plants. This water loss occurs through hydathodes or water stomata. Guttation usually occurs from tips and margins of leaves during early morning when there is high atmospheric humidity as during wet reasons. Water stomata or hydathodes are permanently opened pores.

Question 14

Water lost in Guttation is

Accepted Answer

Guttation is the loss or exertion of water in the form of liquid droplets from the leaves and other parts of an uninjured or intact plant. Guttation takes place through special structures called hydathodes. Water lost during guttation contains inorganic and organic components so, it is not pure.

Question 15

Which one is true about guttation?

Accepted Answer

Guttation refers to the exudation of water droplet (in the form of salt solution) from  the margins and tips of leaves. Guttation water is exuded from the group of leaf cells through specialized openings or pores called hydathodes. It occurs in some angiosperms like garden nasturtium (Tropaeolum) Colocasia, tomato, etc, and is most noticeable where transpiration is suppressed and relative humidity is high such as during the night. It also takes place early in the morning when soil moisture, root pressure and rate of water absorption are higher.

Question 16

Water is lost in a liquid state in some plants through hydathodes. These hydathodes

Accepted Answer

Hydathodes or water pores, unlike stomata, are always open as their guard cells are immobile.

Question 17

Choose the correct statements regarding guttation and pick the correct option from the codes given belowI. It occurs through specialised pore called hydathodeII. Hydathodes can be located on the margin and tips of leavesIII. It occurs in plants growing under condition of low soil moisture and high humidityIV. It occurs in herbaceous plants when root pressure is low and transpiration is high

Accepted Answer

Guttation refers to the exudation of water droplets (in the form of salt solution) from the margin and tips of leaves. Guttation water is exuded from the group of leaf cells through specialised opening or pore structure called hydathodes or water stomata. It occurs in herbaceous plants and in some angiosperms like Colocasia, and tomato. It is finally noticed in the morning in cereals like oat, wheat and maize. It takes place when transpiration is suppressed and relative humidity is high, such as during night.

Question 18

Which one of the following is not related to guttation?

Accepted Answer

In herbaceous plants, when root pressure is high and transpiration is low, plants may lose this extra water in liquid drops from margins of leaves. This process is called guttation. It is very common during warm and humid nights. These water drops contain salts, amino acids, etc.

Question 19

Guttation is the result of

Accepted Answer

Effect of root pressure is observable at night and early morning when evaporation is low and excess water collects in the form of droplets near the tip of leaves of many herbaceous plants. Such water loss in its liquid phase is known as guttation.

Question 20

The movement of water up the stems of tall plants is least dependent on which of the following factors ?

Accepted Answer

(a) Guttation is caused by root pressure. It is only important to the movement of water in quite small plants.

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