Gaseous Exchange in Plants

Q.

Plants take carbon dioxide from the atmosphere mainly through their:

1. roots

2. stems

3. flowers

4. leaves

Q.

How do plants and animals help each other in the exchange of gases in the atmosphere?

Q.

Gaseous exchange in plants takes place through ________.

1. stomata

2. lenticels

3. general surface

4. all of these

Q.

The tiny pores in leaves for the exchange of gases are_____.

1. Stomata

2. Plastids

3. Lenticels

4. Chlorophyll

Q.

Fill in the blanks :

(a) ......................... are the openings found on older stems.

(b) Glycolysis occurs in the ....................of the cells.

(c) .............................is a respiratory substance.

(d) Rate of ..........................is more than the rate of .....................in the daytime in the case of green plants.

(e) ................is a chemical which absorbs oxygen of the air.

(f) ...................... is used to create vacuum to show anaerobic respiration.

Q.

Which pair performs a common function?

(a) Stomata and veins

(b) Stomata and lenticels

(c) Lenticels and sepals

(d) Lenticels and hydathodes

Q. Water travels through the stem of the plants through a bundle of narrow tubes called _______ .​

1. xylem
2. sieve tubes
3. fibres
4. phloem

Q. Guard cells control opening and closing of stomata.

1. False
2. True

Q. Mention one function of each of the following: [3 MARKS]
(a) Lenticels
(b) Sunken stomata
(c) Hydathodes

Q. The given equation indicates which of the following activities in plants?

1. Digestion
2. Respiration
3. Transpiration
4. None of the above

Q.

Plants take in carbon dioxide and give out oxygen during respiration.

1. I & III only

2. II & IV only

Q.

what is lenticels in plants

Q. Briefly describe the process by which (a) oxygen from atmosphere is used up
(b) how​​​​how oxygen is returned to atmosphere

Q.

The maximum loss of water in transpiration is from

1. Lenticels

2. Cuticle

3. Stomata

4. Hydathodes

Q.

Leaves of a healthy potted plants were coated with Vaseline. Select the correct options.

1. It will not get oxygen for respiration.

2. No effect on the plant.

3. It will not get carbon dioxide for photosynthesis.

4. Upward movement of water and minerals would be hampered due to lack of transpiration.

Q.

Roots take up air from air spaces present between soil particles.

1. True
2. False

Q.

Plants do not need to obtain much oxygen from the atmosphere, because ___.

1. Plants do not use oxygen for respiration.

2. Plants carry out cellular respiration using carbon dioxide.

3. Plant metabolism is low

4. Plants produce oxygen during photosynthesis and utilize the oxygen produced for respiration.

Q. Gaseous exchange in plants takes place through ______.

1. stomata
2. lenticels
3. both A and B
4. flower

Q. why can lenticelsbe seen only on the bark of older trees and do not on young green stem

Q.

The tiny pores in leaves for the exchange of gases are:

1. Lenticels

2. Chlorophyll

3. Plastids

4. Stomata

Q. Read the following statements and select the option with correct sets of statements:
a. Ovary of orchids have many ovules.
b. Anatropous ovule is the most primitive type of ovule.
c. Michelia shows apocarpous condition.
d. water hyacinth shows hydrophily.

1. $a$ and $b$
2. $b$ and$C$
3. $C$ and $d$
4. $a$ and $c$

Q. In earthworms, moist surface is necessary for oxygen to be absorbed and carbon dioxide to be given off.

1. False
2. True

Q. Which is not true for hydrophytes?

1. Poorly developed root system
2. Thin membranous leaves
3. Poorly developed large air spaces
4. Poorly developed vascular bundles.

Q. 1.Use of lime water in most experiments on respiration 2. Respiration rate is higher in animals than in plants

Q. Question 45
Which structure protects the plant body against the invasion of parasites?

Q. The tiny pores in leaves for the exchange of gases are:

1. Chlorophyll
2. Stomata
3. Lenticels
4. Plastids

Q. Succulent plants have respiratory quotient less than one because of

1. Complete oxidation
2. Complete reduction
3. Incomplete oxidation
4. Incomplete reduction

Q. What are stomata ? Write it's features

Q.

Answer in one word:

Breathing roots. ___

Q.

Gaseous exchange in plants takes place through ________.

1. stomata

2. lenticels

3. general surface

4. all of these