C3 Cycle

Q.

PGA as the first CO₂ fixation product was discovered in the photosynthesis of:

1. Alga

2. Angiosperm

3. Gymnosperm

4. Bryophyte

Q.

Twelve more ATP molecules are required for glucose formation in $C_4$ palnts because 2 additional ATP molecules are utilized per turn in

1. Carboxylation of PEP

2. Regeneration of PEP

3. Reduction reaction

4. Regeneration of RuBP

Q.

Which is the first stable product formed during the Calvin cycle?

1. Glyceraldehyde-3-phosphate

2. 3-phosphoglycerate

3. Triose phosphate

4. RuBP

Q.

Which enzyme catalyses the process of carbon fixation?

Q.

Production of one molecule of 3-phosphoglyceraldehyde requires how many turns of the Calvin cycle?

1. 2

2. 3

3. 6

4. 1

Q. The sugar produced in the reduction phase of the Calvin cycle is 3-PGA.

1. True

2. False

Q.

What is translocation. Please explain me in layman language.

Q. Which enzyme fixes CO₂ in Calvin cycle?

1. RUBP carboxylase
2. PEP carboxylase
3. Carbonic anhydrase
4. Hexokinase

Q. In $C_3$ plants, the first stable product of photo synthesis during the dark reaction is:

1. 3-phosphoglyceric acid
2. Oxaloacetic acid
3. Phosphoglyceraldehyde
4. Malic acid

Q.

2. Tick the most appropriate answer.
(vii) The process of breaking down a chemical compound into elements, is called

1. analysis

2. synthesis

3. symbiosis

4. photosynthesis

Q.

Identify a, b $\&$ c in the given figure

1. a. - RUBP, b. - Triose Phosphate, c. - PGA

2. a. - PGA, b. - Triose Phosphate, c. - RUBP

3. a. - RUBP, b. - PGA, c. Triose Phosphate

4. a. - Triosephosphate, b. - PGA, c. - RUBP

Q. Choose the correct combination of labelling the carbohydrate molecule involved in the Calvin cycle.

1. A- RuBP, B-Triose phosphate, C-PGA
2. A-PGA, B-RuBP, C-Triose phosphate
3. A-PGA, B-Triose phosphate, C-RuBP
4. A-RuBP, B-PGA, C-Triose phosphate
5. A-Triose phosphate, B-PGA, C-RuBP

Q. How many Calvin cycles are required to produce 5 molecules of glucose?

1. 60
2. 15
3. 30
4. 90

Q. During dark reaction for fixation of carbon, the three carbon atoms of each molecule of 3 phosphoglyceric acid (PGA) are derived from

1. RuBP only
2. RuBP +CO₂
3. RuBP +CO₂ +PEP
4. CO₂ Only

Q.

Which are the $C{O}_2$ fixing enzymes of rice and where are they located?

1. RUBISCO and PEP carboxylase in bundle sheath cells.

2. RUBISCO in mesophyll cells.

3. RUBISCO in bundle sheath cells and PEP carboxylase in mesophyll cells.

4. RUBISCO in mesophyll cells and PEP carboxylase in bundle sheath cells.

Q.

Which type of plants would show higher rate of photosynthesis in low temperature and high $C{O}_2$ concentration?

1. $C_4$ plants

2. Both $C_3$ and $C_4$ plants.

3. $C_3$ plants

4. CAM plants

Q.

Mention the similarities between non-cyclic and cyclic photophosphorylation?

Q.

Organelles having enzymes required for photorespiration are

1. Mitochondria, chloroplasts and ribosomes

2. Mitochondria, peroxisomes and chloroplasts

3. Mitochondria, nucleus and ribosomes

4. Mitochondria, peroxisomes and glyoxysomes

Q.

The energy utilizing steps of the $C_3$ cycle are

1. Carboxylation and reduction

2. Reduction and regeneration

3. Carboxylation

4. All the steps

Q.

The intermediate (6 carbon molecule) in carboxylation phase splits into __ molecules of 3-PGA

Q. In photosynthesis, photolysis of water is used in

1. Reduction of NADP${}^{+}$
2. Oxidation of FAD
3. Oxidation of NADP
4. None of the above

Q. In calvin benson cycle by using RUBPA &PGA we get ADP+P+NADP , after cycle what will they do?