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Figure represents the vertical section of a leaf.
Name the structure shown in the leaf section.

Important Questions on Plant Water Relation

MEDIUM
Biology>Physiology>Plant Water Relation>Transpiration
Three uniformly watered plants i, ii and iii were kept in 45% relative humidity, 45% relative humidity with blowing wind and 95% relative humidity, respectively. Arrange these plants in the order (faster to slowest) in which they will dry up.
EASY
Biology>Physiology>Plant Water Relation>Transpiration
Transpiration and root pressure cause water to rise in plants by:
MEDIUM
Biology>Physiology>Plant Water Relation>Transpiration
Stomatal movement is not affected by
EASY
Biology>Physiology>Plant Water Relation>Transpiration

Identify the correct match of the type of water given in column-I and its character in column-II and select the correct option.

Column-I Column-II
(i) Capillary water (a) present in the form of hydrated oxides of silicon and aluminium.
(ii) Hygroscopic water (b) goes down through large pores between soil particles and reaches the water table.
(iii) Combined water (c) held in between small non-colloidal soil particles.
(iv) Gravitational water (d) held tightly around soil particles by adhesive forces.
HARD
Biology>Physiology>Plant Water Relation>Transpiration
"Transpiration is a necessary evil". Explain.
EASY
Biology>Physiology>Plant Water Relation>Transpiration
If the humidity of the atmosphere suddenly increases substantially, the water flow in the xylem will-
MEDIUM
Biology>Physiology>Plant Water Relation>Transpiration

Study the diagram and the list given below.

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i) Chloroplast

ii) Epidermal cell

iii) Guard cell

iv) Subsidiary cell

v) Stomatal pore

The correct match is

EASY
Biology>Physiology>Plant Water Relation>Transpiration
Which one of the following anatomical structures is involved in guttation?
 
MEDIUM
Biology>Physiology>Plant Water Relation>Transpiration
Explain Transpiration pull theory.
HARD
Biology>Physiology>Plant Water Relation>Transpiration
"Transpiration is a necessary evil". Discuss.
EASY
Biology>Physiology>Plant Water Relation>Transpiration
Draw a diagram of stomata of Rheo leaf and write any two functions of stomata.
EASY
Biology>Physiology>Plant Water Relation>Transpiration

Given below is a diagram of the stomatal apparatus. Match the labels with the corresponding names of the compounds. 

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Choose the correct combination.

EASY
Biology>Physiology>Plant Water Relation>Transpiration
Which one gives the most valid and recent explanation for stomatal movements?
MEDIUM
Biology>Physiology>Plant Water Relation>Transpiration
Which of the following facilitates opening of stomatal aperture?
HARD
Biology>Physiology>Plant Water Relation>Transpiration
Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening, carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of the following options:
MEDIUM
Biology>Physiology>Plant Water Relation>Transpiration
Take two plants, keep plant A in very dry conditions and plant B in high humidity. Simultaneously, immerse the roots of both plants in water with a red dye. What would you observe?
EASY
Biology>Physiology>Plant Water Relation>Transpiration
The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is
MEDIUM
Biology>Physiology>Plant Water Relation>Transpiration
Which of the following in guard cell is responsible for opening of stomata?
MEDIUM
Biology>Physiology>Plant Water Relation>Transpiration

The leaves of a well-watered potted plant were found wilted during a hot sunny.

What advantage would the plant have derived from wilting?

EASY
Biology>Physiology>Plant Water Relation>Transpiration
Wilting occurs when