The order of the three steps of Calvin cycle is-
a. Carboxylation- Reduction-Regeneration
b. Reduction-Regeneration- Carboxylation
c. Regeneration-Carboxylation- Reduction
d. Reduction- Carboxylation –Regeneration
For the formation of one molecule of Glucose, how many turns of fixation are required?
a. 3
b. 2
c. 6
d. 4
Melvin-Calvin used ------- radioactive in-----studies for the discovery of first CO2 fixation product.
a. 14C , Fungal photosynthesis
b. 14C , Algal photosynthesis
c. 15N , Fungal photosynthesis
d. 15N , Algal photosynthesis
Dark reaction depends upon-
a. Presence of darkness
b. Presence of light
c. Products of light reactions
d. Products of biosynthetic phase
The first dark reaction or CO2 fixation product is-
a. 3C – Organic Acid
b. 6C – Organic Acid
c. 5C – Organic Acid
d. 1C – Organic Acid
Which of the following statements is incorrect?
(1) RuBisCO is a bifunctional enzyme
(2) In C4 plants, the site of RuBisCO activity is mesophyll cell
(3) The substrate molecule for RuBisCO activity is a 5-carbon compound
(4) RuBisCO action requires ATP and NADPH
The synthesis of one molecule of glucose during the Calvin cycle requires.
1. 12 molecules of ATP and 18 molecules of
2. 6 molecules of ATP and 12 molecules of
3. 18 molecules of ATP and 12 molecules of
4. 12 molecules of each of ATP and
How many molecules of 3-PGA are produced during a single run of carboxylation?
1. 3
2. 1
3. 2
4. 4
If there are 12 molecules of CO2 to be fixed in photosynthesis, then how many turns of the Calvin cycle and how many molecules of glucose will be synthesized respectively?
1. 9 turns, 2 molecules.
2. 12 turns, 1 molecule.
3. 6 turns, 1 molecule.
4. 12 turns, 2 molecules.
Match the following columns and select the correct option.
Column-I | Column-II |
a. Photolysis of water | (i) C plants |
b. Carboxylation of RuBP | (ii) Non-cyclic photophosphorylation |
c. Synthesis of ATP only | (iii) Cyclic photophosphorylation |
d. Consumption of 5 ATP per CO2 fixed |
(iv) Calvin cycle |
1. a (ii), b (iv), c (iii), d (i)
2. a (iii), b (iv), c (ii), d (i)
3. a (ii), b (i), c (iii), d (iv)
4. a (iii), b (i), c (ii), d (iv)