Q. No.Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because
1.
The primary fixation of CO2 is mediated via PEP carboxylase
2.
Effective pumping of CO2 into bundle sheath cells
3.
Four carbon acids are the primary initial CO2 fixation products
4.
RuBisCO in C4 plants has a higher affinity for CO2
The chemiosmotic coupling hypotheisis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because
| 1. | a proton gradient forms across the inner mitochondrial membrane. |
| 2. | There is a change in the permeability of the inner mitochondrial membrane towards adenosine diphosphate (ADP). |
| 3. | high energy bonds are formed in mitochondrial proteins |
| 4. | ADP is pumped out of the matrix into the intermembrane space. |
Which of the following is incorrect about the light reactions of photosynthesis?
| 1. | P680 and P700 are the reaction centres of PS-I and PS-II respectively |
| 2. | Light energy provides energy for the photolysis of water through excitation of the reaction centre of PS-II |
| 3. | NADPH is not produced in cyclic electrons transport in light reactions |
| 4. | Reactions of the two photosystems are needed for the reduction of NADP |
In blue-green algae, photosystem- II contains important pigment concerned with photolysis of water. It is a
(1) phycocyanin
(2) cytochrome-c
(3) chlorophyll -
(4) -carotene
In Kranz anatomy, the bundle sheath cells have
| 1. | thin walls, many intercellular space and no chloroplast |
| 2. | thick walls, no intercellular spaces and large number of chloroplasts |
| 3. | thin walls, no intercellular spaces and several chloroplasts |
| 4. | thick walls, many intercellular space and few chloroplasts |
The C4 plants differ from C3 plants with reference to the:
| 1. | substrate that accepts CO2 in carbon assimilation |
| 2. | type of end product |
| 3. | type of pigment involved in photosynthesis |
| 4. | end product that will be formed |
Match the Columns.
|
Column I (Scientists) |
Column II (Discoveries) |
|
A. Stephen Hales |
1. Importance of light and chlorophyll |
|
B. Ingen Housz |
2. Presence of chlorophyll in plants. |
|
C. Von Mohl |
3. Product of photosynthesis is starch. |
|
D. Sach |
4. Air and light control plant growth. |
Code
|
|
A |
B |
C |
D |
|
(1) |
4 |
1 |
2 |
3 |
|
(2) |
3 |
2 |
1 |
4 |
|
(3) |
2 |
3 |
4 |
1 |
|
(4) |
4 |
3 |
2 |
1 |
Photosynthesis is a-
a. Biochemical process
b. Physical process
c. Chemical process
d. Physico-chemical process
Which of the following statements does not justify the importance of photosynthesis?
| 1. | it is the primary source of all food on earth. |
| 2. | it is responsible for the release of oxygen into the atmosphere. |
| 3. | it is responsible for the water balance on earth. |
| 4. | use of energy from sunlight by plants doing photosynthesis is the basis of life on earth. |
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