C3 Cycle

Q.

Phosphoenolpyruvate (PEP) is the primary CO2 acceptor in:

1. C3 plants

2. C4 plants

3. C2 plants

4. C3 and C4 plants

Q.

Name the raw materials needed for photosynthesis.

Q.

When is the Z Scheme shape formed?

Q.

Name the site of photosynthesis in plants.

Q.

Explain - chlorophyll is essential for photosynthesis.

Q.

Which is the first stable product of Calvin cycle?

Q.

What are the 3 regulatory enzymes of the TCA cycle?

Q. From the diagram given below which represents the Calvin cycle, name the molecules A and B.

1. 3-phosphoglycerate - A,
   triose phosphate - B
2. Glucose - A,
   3-phosphoglycerate - B
3. Triose phosphate - A,
   3-phosphoglycerate - B
4. Triose phosphate -A, glucose - B

Q. Oxygen released during photosynthesis comes from

1. carbon dioxide
2. glucose
3. chlorophyll
4. water

Q. The final products of photosynthesis in plants are

1. ATP and NADPH
2. carbon dioxide and 3-PGA
3. water
4. glucose and oxygen

Q.

What Plant Has The Highest Rate Of Photosynthesis?

Q. In the calvin cycle, triose phosphate is formed during

1. carboxylation stage
2. reduction stage
3. regeneration stage
4. oxidation stage

Q. How many molecules of 3-PGA are formed during the synthesis of one molecule of glucose?

1. 6
2. 18
3. 3
4. 12

Q. Which of the following is the most abundant enzyme in the world?

1. RuBisCO
2. PEPcase
3. ATP synthase
4. NADP reductase

Q.

Photorespiration occurs in

1. Ribosomes

2. Mitochondria

3. Peroxisome

4. Both B and C

Q. For the synthesis of one molecule of glucose, the Calvin cycle repeats how many times?

1. 3
2. 4
3. 5
4. 6

Q. In the Calvin cycle the first product identified was 3-phosphoglyceric acid (PGA). How many carbon atoms does it have?

Q.

What is the role of ATP synthase in photosynthesis?

Q. Approximate percentage of light energy utilized for photosynthesis by plants is.

1. 10
2. 50
3. 100
4. 1-2

Q. Chemiosmotic theory of ATP synthesis in the chloroplast and mitochondria is based on:

1. Proton gradient
2. Accumulation of $K^{+}$ ions
3. Accumulation of $N{a}^{+}$ions
4. Membrane permeability

Q.

How does malonate affect cellular respiration?

Q. The efficiency of aerobic respiration is approximately

1. $30\%$
2. $45\%$
3. $50\%$
4. $90\%$

Q.

During what stage of cellular respiration is the most ATP synthesized?

1. chemiosmosis

2. glycolysis

3. oxidation of pyruvate

4. Krebs cycle

Q. The primary acceptor of carbon dioxide in C${}_3$ plants is a

1. 6 carbon compound
2. 5 carbon compound
3. 3 carbon compound
4. 2 carbon compound

Q. Identify the correct sequence of phases in calvin cycle.

1. Carboxylation → Regeneration → Reduction

2. Carboxylation → Reduction → Regeneration

3. Reduction → carboxylation→ Regeneration

4. Regeneration → carboxylation → Reduction

Q.

The products of photosynthesis are ______ and ______.

Q. In Calvin cycle, the products of the light reaction (ATP and NADPH) are first utilized in the

1. reduction step of the Calvin cycle
2. regeneration step of the Calvin cycle
3. carboxylation step of the Calvin cycle
4. all of these

Q.

What is the role of ATP in photosynthesis?

Q. Choose the incorrect statement about Calvin cycle:

1. It begins with the carboxylation of $\mathrm{RuBP}$
   
2. 3-Phosphoglycerate is the first ${\mathrm{CO}}_2$ fixation product
   
3. One, out of six $3-\mathrm{PGA}$ molecules, is used for production of glucose
   
4. PEP carboxylase fixes ${\mathrm{CO}}_2$ in $C_3$ cycle
   

Q. Read the following statements and select the correct option factor affecting photosynthesis

1. Current availability of $C{O}_2$ levels is not limiting to the $C_3$ plants
2. Saturation occurs at 10 percent of the full sunlight
   
3. Water stress never makes leave wilt, but reduces the surface area of the leaves
   
4. $C_3$ plants respond to higher temperature and shows higher rate of photosynthesis