What Is Stomata

Q.

List the three events that occur during the process of photosynthesis. Explain the role of stomata in this process

Q. Why and how the active site of RuBisCO can bind to both CO₂ and O₂

Q. Plant in deserts have few stomata to reduce

1. Water intake
2. Water loss
3. Mineral content
4. Oxygen intake

Q.

The distribution of stomata are equal on both the surface of leaf are seen in

1. Monocot leaf

2. Dicot stem

3. Monocot stem

4. Dicot leaf

Q. Stomata are present on the underside of

1. Flower
2. Fruit
3. Seed
4. Leaf

Q. Regulation of gaseous exchange at the stomata helps in bringing down .

1. cellular respiration
2. photorespiration
3. translocation
4. evaporation

Q. In plants, exchange of gases takes place through

1. Stomata
2. Mid-rib
3. Palisade tissue
4. Spongy tissue

Q. Assertion :Stomata remain open during day. Reason: Stomata help in exchange of gases.

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.

CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they

1. fix CO2 into organic acids during the night.

2. fix CO2 into sugars in the bundle-sheath cells.

3. fix CO2 into pyruvate in the mesophyll cells.

4. use the enzyme phosphofructokinase, which outcompetes rubisco for CO2.

Q. Main task of stomata is to

1. Intake of carbon dioxide and the release of oxygen
2. Intake of water
3. Release of carbon dioxide
4. Release of sugars

Q. Stomata are present on the underside of

1. Flower
2. Fruit
3. Seed
4. Leaf

Q. Plant in deserts have few stomata to reduce

1. Water intake
2. Water loss
3. Mineral content
4. Oxygen intake

Q. Transpiration helps in the

1. Electrolyte balance
2. Opening of stomata
3. Absorption of water by roots
4. Excretion of minerals

Q. Microscopic pores in plants are called as

1. Stigma.
2. Thalamus.
3. Gills.
4. Stomata.

Q. Assertion :Photosynthesizing cells serve as sources of the assimilates. Reason: Photosynthates are translocated from source.

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. Assertion is incorrect but Reason is correct.

Q. Which of the following statements is characteristic feature of CAM plants

1. Release oxygen during day
2. Do not respire during day
3. Open their stomata during night
4. Release oxygen during night

Q. A sudden increase in carbon dioxide concentration around a leaf will cause:

1. Wider opening of stomata
2. Increase in transpiration
3. Closure of stomata
4. Decrease in transpiration due to closure of stomata

Q.

in CAM plants why acid concentration increase at night and decrease at day time

Q. Kranz type of leaf anatomy is observed in the

1. $C_4$ plants.
2. Hydrophytic plants.
3. $C_3$ plants.
4. $C_3$ and $C_4$ plants.

Q. CAM photosynthesis occurs in plant with

1. Thin green leaves with reticulate venation
2. Thin green leaves with parallel venation
3. Fleshy green leaves
4. Thin coloured leaves