Gaseous Exchange in Plants

Q. Assertion: Plants can live without special respiratory organs.
Reason: Every living cell in the plant is present very close to the plant surface which facilitates easy exchange of gases. Also, oxygen availability is not an issue since oxygen is produced during photosynthesis.

1. Both assertion and reason are correct statements and reason is the correct explanation
2. Assertion is an incorrect statement but the reason is a correct statement
3. Both are incorrect statements
4. Both assertion and reason are correct statements but the reason is incorrect explanation

Q.

List five adaptations found in desert plants to reduce transpiration.

Q.

Plants breathe through…….

Q.

Name the following:

The pores through which leaves exchange gases.

Q. In plants, gaseous exchange in plants occurs through the process of

1. Diffusion
2. Osmosis
3. Active transport
4. None of the above

Q. When glucose is administered orally, which process takes place first?

1. Circulation
2. Respiration
3. Excretion
4. Digestion

Q. In plants, gaseous exchange in plants occurs through the process of

1. Active transport
2. Diffusion
3. None of the above
4. Osmosis

Q.

What is the difference between lenticels and stomata?

Q. Name the structure responsible for gaseous exchange in leaves of plants.

Q. The main ingredients of photosynthesis are:

1. Chlorophyll, ${\text{O}}_2$, Light, ${\text{H}}_2\text{O}$
2. Chlorophyll, ${\text{CO}}_2$, ${\text{O}}_2$, ${\text{H}}_2\text{O}$
3. n(${\text{CH}}_2\text{O}$), light and ${\text{CO}}_2$
4. Chlorophyll, light, ${\text{CO}}_2$, ${\text{H}}_2\text{O}$

Q.

Kidney-shaped cells forming the stomata are:

1. Guard cells

2. Collenchyma

3. Epidermal cells

4. Dumbbell cells

Q. State whether the following statements are true or false .
Transpiration takes place only through stomata in terrestrial plants.

1. True
2. False

Q.
How do the following structures help in respiration in plants?
(a) Lenticels
(b) Stomata
(c) Root hairs

Q. What is the effect of carbon dioxide on the rate of respiration in plants?

1. Rate of respiration in plants decreases with increase in $C{O}_2$ concentration
   
2. Carbon dioxide has no effect on respiration rate
3. Rate of respiration first increases then decreases with increase in $C{O}_2$ concentration
   
4. Rate of respiration in plants increases with increase in $C{O}_2$ concentration

Q. What is transpiration? Explain various factors affecting it.

Q.

Leaves have stomata for the exchange of gases.

1. True
2. False

Q. In guard cells, when sugar is converted into starch, the stomatal pore

1. Opens fully
2. Opens partial
3. Closes completely
4. Remian unchanged

Q. Which one is responsible for opening of stomata ?

1. More free H${}^{+}$ ions and less Cl${}^{-}$
2. Increase in CO${}_2$ concentration and increase in H${}^{+}$ ion concentration
3. Decrease in CO${}_2$ concentration and increase in H${}^{+}$ ion concentration
4. Decrease in CO${}_2$ concentration and decrease in H${}^{+}$ ion concentration

Q. Very short answer type :
List two characters of pollen grains that favour anemophily in plants.

Q. The two organisms which breathe only through their moist skin are

Q. In the process of respiration in plants 180g of glucose plus 192 g of oxygen produce ___________________.

1. 132 g of $C{O}_2$, 54 g of water and 343 Cal. of energy
2. 264 g of $C{O}_2$, 108 g of water and 686 Cal. of energy
3. 528 g of $C{O}_2$, 216 g of water and 1372 Cal. of energy
4. Large amount of $C{O}_2$, no water and no energy

Q. Which of the following is asexual method of reproduction?

1. Spore formation
2. All of the above
3. Budding
4. Division

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. Plants produce oxygen during photosynthesis and utilise the oxygen produced for respiration.
4. Plants do not carry out respiration.

Q. Assertion: Plants can live without special respiratory organs.
Reason: Every living cell in the plant is present very close to the plant surface which facilitates easy exchange of gases. Also, oxygen availability is not an issue since oxygen is produced during photosynthesis.

1. Both assertion and reason are correct statements and reason is the correct explanation
2. Both assertion and reason are correct statements but the reason is incorrect explanation
3. Assertion is an incorrect statement but the reason is a correct statement
4. Both are incorrect statements

Q. Element involved in stomatal regulation, its opening and closing is

1. Zinc
2. Magnesium
3. Potassium
4. Iron

Q. How does guard cells help in opening of stomata?

Q. The primary osmolite, which causes an opening and closing of stomata is

1. Starch
2. K-malate
3. Water
4. Sugars

Q. The pathway of water from the soil through the plant to the atmosphere is best represented by which of the following sequences:

1. Endodermis- cortex - epidermis - vessel elements - intercellular spaces in mesophyll – stomata
2. Epidermis - cortex - endodermis - sieve cells - intercellular spaces in the mesophyll – stomata
3. Root hairs - cortex - endodermis - vessel elements - intercellular spaces in mesophyll –stomata
4. Epidermis - endodermis - phloem - cortex of leaf - intercellular spaces of mesophyll – stomata

Q.

___ is supplied by water to plants.

Q. Since photosynthesis begins with 2 reactants co2 and h2o, is it right to say light phase is responsible for breakdown of h2o and dark phase is responsible for breakdown of co2 into their respective biproducts?