Stomatal Transpiration.

Q.

Stomata of desert plants remain closed during day time. How do they take up carbon dioxide and perform photosynthesis?

Q.

Stomata remain closed in desert plants during day time. How do they do photosynthesis?

Q.

Mesophyll cells in a leaf are the principal center for photosynthesis.

1. False

2. True

Q.

Why aquatic plants don't have stomata?

Q.

Differentiate between transpiration and evaporation.

Q.

__ are two theories about the opening and closing of stomata.

Q. Explain the mechanism involved in external respiration.

Q. Plants can get rid of excess water by a process called

1. Guttation
2. Condensation
3. Transpiration
4. Photoluminescence

Q.

Cobalt chloride paper remains blue on the upper surface of the leaf but turns pink on the lower surface of the leaf. This proves that:

1. There are no stomatal openings on the upper side of the leaf.

2. There are less stomatal openings on the lower side of the leaf.

3. There are more stomatal openings on the upper side of the leaf.

4. There are more stomatal openings on the lower side of the leaf.

Q.

Water absorbed by the roots from the soil reach the tissues of the leaves through ___ .

1. veins

2. xylem

3. phloem

4. both xylem and veins

Q. How do stomata open & close?

Q.

Write the adaptations found in desert plants like prickly pear.

Q.

The percentage of water used for photosynthesis is____________.

1. 50%

2. 20%

3. 10%

4. 2%

Q.

State the exact location of the following:

(b) Guard cell

Q.

Which of the following is/are functions of the stomata present in the leaf?

1. Absorbing carbon dioxide from the atmosphere

2. Giving out oxygen into the atmosphere

3. Transpiration of excess water

4. Control of sunlight entering in the leaves

Q. During hot and dry days, the guard cells become allowing transpiration than the normal days.

1. turgid
2. flaccid
3. more
4. less
5. bulged
6. rapid

Q.

Stomatal transpiration - This is the most dominant form of transpiration.

1. False

2. True

Q.

Give reason:

Transpiration is lower on a humid day.

Q.

Given below is a set of five terms. Rewrite the terms in a logical sequence as directed at the end of each statement.

Stoma, Mesophyll cell, Xylem, Substomatal space, Intercellular space (loss of water due to transpiration).

Q.

Which of the following processes results in the loss of water in the form of water vapour through stomata.

1. Wilting

2. Transpiration

3. Osmosis

4. Diffusion

Q. Mention whether the following statement is true or false and give explanation in support of your answer.
Guttation is another name for bleeding in plants.

1. True
2. False

Q.

Enlist three adaptationsof leaves for photosynthesis

Q.

_______ have guard cells.

Q. Tiny pores present on the leaves of plants are called as

1. Stomata
2. Cells
3. Grains
4. Chlorophyll

Q.

Give scientific reasons for the following statement.

The leaves of certain plants roll up on a bright sunny day.

Q. Can girdling experiments be done in monocots ? If yes, How ? If no, why not ?

Q.

State whether the following statements are true or false.

A peeled potato transpires more slowly than an unpeeled potato.

1. True
2. False

Q. Find out whether the given statement is true or false and give reason in support of your answer.
Hydathodes are similar to stomata in plant physiology.

1. True
2. False

Q. Assertion :Plant have no specialised respiratory organs. Reason: There is very little transport of gases from one plant part to another.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Stomatal movements are influenced by a number of environmental factors. Which of the following statements is/are incorrect regarding this?
(i) Blue light keeps stomata open during the day promoting the movement of $K^{+}$ ions into guard cells.
(ii) Increased $C{O}_2$ concentration reduces the pH of guard cells which promotes conversion of sugar into starch, ultimately causing closure of stomata.
(iii) Abscisic acid, under stress conditions, causes rapid movement of $K^{+}$ ions into guard cells.
(iv) Highly concentrated sucrose or salt solution when applied over to stomata, results in stomatal opening.

1. (i) and (ii)
2. (iii) and (iv)
3. (iii) only
4. (iv) only