Transpiration

Q. Passive absorption of water in plants is mainly occurs due to

1. transpiration
2. capillarity
3. presence of solutes in soil
4. imbibition

Q.

What is the purpose of the reservoir in Ganongs potometer?

Q.

On what principle does potometer work?

Q.

How do sunken stomata reduce transpiration?

Q.

At high atmospheric humidity, why is the rate of transpiration low?

Q.

Do you think that air bubbles are helpful in measuring the rate of transpiration? If yes, briefly explain the apparatus in which air bubbles are used for this purpose.

Q.

Terrestrial plants lose most of the water absorbed through __ from the leaves.

Q.

The rate of transpiration will be very less in a situation where

1. ground water is sufficiently available

2. wind is blowing with a very high velocity

3. environment is very hot and dry

4. relative humidity is very high

Q.

Write the differences between Transpiration and Guttation (structures involved).

Q.

What does a potometer measure?

Q.

Name the process/term for the statements given below:

A type of transpiration occurs directly from the surface of leaves and stems.

Q.

Name the following:

The apparatus used for measuring the rate of transpiration.

Q. Guard cells help in:

1. Fighting against infection
2. Protection against grazing
3. Transpiration
4. Guttation

Q.

Complete the following statement by choosing the correct option out of those given within brackets.
Potometer is an instrument used for measuring the rate of (transpiration/evaporation).

Q. Which of the following exhibits a direct proportionality to transpiration?

1. Light and RH
2. Temperature and RH
3. Temperature and wind
4. RH and wind

Q. Select the correct statement(s) pertaining to transpiration process in plants:
I. It is a necessary evil for plants.
II. Loss of water takes place through hydathodes in vapour form.
Ill. It may also occur through lenticels.
IV. The process is active during night in C${}_3$ plants.

1. I and IV are correct
2. II and IV are correct
3. I and Ill are correct
4. Ill and IV are correct

Q.

Which of the following plants will not have transpiration?

1. Plants growing in hilly regions

2. Aquatic, submerged plants

3. Plants growing in deserts

4. Aquatic plants with floating leaves

Q. Rate of transpiration and stomatal movement are measured respectively by

1. porometer and potometer
2. potometer and porometer
3. potometer and tensiometer
4. hygrometer and porometer

Q. When the conditions are dry, a grass leaf curls inward to minimize water loss due to presence of

1. thick cuticle
2. large xylem cavities
3. parallel venation
4. bulliform cells

Q.

Which of the following plants will not have transpiration?

1. Plants growing in hilly regions

2. Aquatic, submerged plants

3. Plants growing in deserts

4. Aquatic plants with floating leaves