CAM Pathway

Q.

The first stable product in CAM/C4 plants is

1. Starch
2. Oxaloacetic acid
3. Sugar
4. Malic acid.

Q.

Identify incorrect statement about CAM Plants

1. CAM plants show CO₂ fixation in two kinds of cells

2. CO₂ is fixed during night and glucose is made during day

3. CO₂ fixation and calvin cycle are separated by time

4. CAM plants show scotoactive type of ofomata

Q.

In the following question, a statement of assertion is following by a statement of reason. Mark the correct choice as:
Assertion: CAM plants lack structural compartmentation of a leaf as found in $C_4$ plants.
Reason: Stomata of CAM plants are open during the day.

1. If both assertion and reason are true and reason is the correct explanation of assertion.

2. If both assertion and reason are true but reason is not the correct explantion are true but reason.

3. If both assertion and reason are false

4. If assertion is true but reason is false.

Q.

Which of the following is NOT a character of plants having CAM (Crassulacean Acid Metabolism) cycle?

1. CAM plants use PEP carboxylase during daytime and RUBISCO during the night

2. In CAM plants, stomata open during the night and close during daytime

3. CAM plants are mostly succulents living in xerophytic conditions

4. CAM plants lack Kranz anatomy

Q. Select the wrongly matched pair with regard to $C_4$ - cycle.

1. Site of initial carboxylation-Mesophyll cells
2. Location of enzyme RuBisCO-Bundle sheath cells
3. Primary $C{O}_2$ fixation-PGA product
4. Primary $C{O}_2$ acceptor- PEP
5. $C_4$-plant-Maize

Q. Assertion :Stomata open and close in response to turgor changes. Reason: pH changes are brought about by influx and efflux of H${}^{+}$ ions.

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.

In CAM-plants, carbon dioxide required for photosynthesis enters the plant body during

1. Night, through the open stomata

2. Day time through open stomata

3. Night when the hydathodes are open

4. Day time throught the lenticels

Q. In a CAM-plant, the concentration of organic acid

1. Increases during the day
2. Increases during night
3. Decreases or increases during the day
4. Decreases during any time

Q. Stomata of CAM plants:

1. Are always open
2. Open during the day and close at night
3. Open during the night and close during the day
4. Never open