EASY
Earn 100

Sunken stomata are found in leaves of

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Important Questions on Plant Water Relation

MEDIUM

Given below are two statements:

Statement I: The forces generated by transpiration can create pressures sufficient to lift a xylem sized column of water over 130 metres high.
Statement II: Transpiration cools leaf surfaces, sometimes 10 to 15 degrees, by evaporative cooling.

In the light of the above statements, choose the most appropriate answer from the options given below:

HARD
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
Explain Transpiration pull theory.
HARD
"Transpiration is a necessary evil". Discuss.
MEDIUM

Study the diagram and the list given below.

Question Image

i) Chloroplast

ii) Epidermal cell

iii) Guard cell

iv) Subsidiary cell

v) Stomatal pore

The correct match is

EASY
Draw a diagram of stomata of Rheo leaf and write any two functions of stomata.
HARD
"Transpiration is a necessary evil". Explain.
MEDIUM
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

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

Question Image

Choose the correct combination.

MEDIUM
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
The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is
EASY
Transpiration and root pressure cause water to rise in plants by:
MEDIUM
Define transpiration. Name the types of transpiration. Give the mechanism of transpiration giving V.S. of leaf?
EASY
Water lost in guttation is?
MEDIUM
Describe the active K+ ion theory for stomatal opening?
MEDIUM
Explain why transpiration in higher plants is considered a necessary evil?
EASY
The stomata in CAM plants open during
MEDIUM
Write a note on hydathodes. Differentiate hydathodes from stomata?
MEDIUM
Why do well-watered plants transpire more during sunny and windy days than on cool and calm mornings? How transpiration is different from evaporation?