Q. No.Which is not true regarding cyclic electron transfer system (ETS) in thylakoid membrane of higher plants?
1.
Operates at low light intensity
2.
Only PS I is involved
3.
Acts as a back up for ATP synthesis
4.
External electron donor is required
Study the pathway ATP synthesis through chemiosmosis given below –
In which of the following options correct words for all the three blanks A, B, C and D are indicated –
| 1. | A – F1, B – Thylakoid membrane, C – Photosystem (I), D – Photosystem (II) |
| 2. | A – F0, B – Thylakoid membrane, C – Photosystem (I), D – Photosystem (II) |
| 3. | A – F1, B – Thylakoid membrane, C – Photosystem (II), D – Photosystem (I) |
| 4. | A – F0, B – Thylakoid membrane, C – Photosystem (II), D – Photosystem (I) |
Why photorespiration does not take place in C4 plants?
1. Do not contain RuBisCo.
2. Have a mechanism that increases the concentration of CO2 at the enzyme site.
3. Cells do not allow oxygen to accumulate in them.
4. Cells are impermeable to oxygen.
Sunlight is essential for photosynthesis is established
by
1. Jan Ingenhousz
2. Robert Hill
3. Emerson
4. Julius Von Sach
The following processes occur during photosynthesis
(i) Reduction of carbon dioxide
(ii) The splitting of water
(iii) The synthesis of glucose
(iv) Release of oxygen
(v) Formation of ATP
Which one of the following combinations is correct for the light phase ?
1. i, ii and iii
2. iii, iv and v
3. i, iii and iv
4. ii, iv and v
Select the Incorrect statement from the following.
| 1. | Nostoc performs oxygenic photosynthesis. |
| 2. | During photorespiration, O2 is first utilized in chloroplast, and CO2 is released in mitochondria. |
| 3. | In a chloroplast, lumen of thylakoids always have least number of protons during photophosphorylation. |
| 4. | In the plants like sugarcane and Amaranthus, primary CO2 acceptor is phosphoenol pyruvate. |
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) |
Proton gradient develops across the thylakoid membrane due to all, except
| 1. | Splitting of water towards lumen side |
| 2. | NADP+ reduction towards stroma side |
| 3. | Movement of protons from lumen to stroma side by PQ |
| 4. | Release of H+ from stroma to lumen side by a H-carrier |
C4 and CAM plants have many similarities, like
| 1. | Secondary CO2 fixation by Rubisco |
| 2. | Scotoactive stomata |
| 3. | Primary CO2 fixation by PEPCase in bundle sheath |
| 4. | Presence of Kranz anatomy |
In photorespiration (C2 cycle)
| 1. | Glycolate is oxidised in mitochondria |
| 2. | CO2 is released in peroxisome |
| 3. | Expenditure of ATP occurs |
| 4. | Light is utilised by all three organelles involved |
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