Which of the following is an activator for both ribulose biphosphate carboxylase-oxygenase and phosphoenol pyruvate carboxylase?
1. Zinc
2. Magnesium
3. Manganese
4. Molybdenum
It is a common observation that CAM plants are not tall. The reason most likely is:
1. They would be unable to move water and minerals to the top of the plant during the day.
2. They would be unable to supply sufficient sucrose for active transport of minerals into the roots during the day or night
3. Transpiration occurs only at night, and this would cause a highly negative in the roots of a tall plant during the day.
4. Since the stomata are closed in the leaves, the Casparian strip is closed in the endodermis strip is closed in the endodermis of the root.
Go through the following statements about the chemiosmotic mechanism
I. protons are pumped across the membrane.
II. Protons return through the membrane by way of a channel protein.
III. ATP is required for protons to return.
IV. The membrane in questions is the inner mitochondrial membrane.
V. Proton pumping is associated with the respiratory chain.
1. V is incorrect.
2. III is incorrect.
3. III and V is correct .
4. Only III is correct.
Match the following and choose the correct option from those given below.
Column A Column B
A. Molecular oxygen (i) Ketoglutaric acid
B. Electron acceptor (ii) hydrogen acceptor
C. Pyruvate dehydrogenase (iii) cytochrome C
D. Decarboxylation (iv) acetyl CoA
1. A–ii, B–iii, C–iv, D–i
2. A–iii, B–iv, C–ii, D–i
3. A–ii, B–i, C–iii, D–iv
4. A–iv, B–iii, C–i, D–ii
Half-leaf experiment, where a part of leaf is enclosed in a test tube containing KOH is performed to show that :-
1. is required for photosynthesis.
2. is required for photosynthesis.
3. Light is required for photosynthesis .
4. is source of released during photosynthesis.
Although concentration of is increased but there is no increase in rate of photosynthesis reason could be (for both and plants)
1. Low light intensity.
2. Water stress.
3. High internal O2 concentration .
4. Both 1 and 2.
The plants show saturation to concentration at about
1. 450 ppm
2. 0 10 ppm
3. 360 ppm
4. 25 100 ppm
The reaction that is responsible for the primary fixation of is catalysed by
1. RuBP carboxylase.
2. PEP carboxylase.
3. RuBP carboxylase and PEP carboxylase.
4. PGA synthase.
Which pigment acts directly to convert light energy to chemical energy?
1. Chlorophyll a.
2. Chlorophyll b.
3. Xanthophyll.
4. Carotenoid.
Splitting of water is associated with
1. Photosystem I.
2. Lumen of thylakoid.
3. Both Photosystem I and II.
4. Inner surface of thylakoid membrane.
Examine the figure given below and select the wrong option
1. A - Present in only grana lamellae.
2. B - involves down hill movement of electron in terms of oxidation reduction potential .
3. C - Absorbs 700 nm light.
4. The electrons return back to the reaction center.
CO2 is utilized for the carboxylation of RuBP inside the bundle sheath cells of
1. Maize, Sorguhm.
2. Tomato, Bell pepper.
3. Cacti, Sedum.
4. Rice, Wheat.
In the given graph what does A, B represent?
1. A - Absorption spectrum; B - Action spectrum (Chl. a).
2. A - Action spectrum; B - Absorption spectrum (carotenoids).
3. A - Absorption spectrum; B - Action spectrum (Ch. b).
4. A - Action spectrum; B - Absorption spectrum (Ch.a).
Initial carboxylation reaction in and plants occurs respectively in
plants plants
1. Mesophyll cells - Mesophyll cells.
2. Mesophyll cells - Bundle sheath cells.
3. Bundle sheath cells - Mesophyll cells.
4. Bundle sheath cells - Bundle sheath cells.
Which one of the following is incorrect statement?
1. Phosphoenol pyruvic acid is most efficient acceptor in plants.
2. Leaves of plants show kranz anatomy.
3. In CAM plants, acidification (formation of malic acid) occurs in presence of light.
4. Chlorophyll consists of a porphyrin head & a phytol tail.
In C4 plants, number of carbon atoms in
(a) Primary CO2 acceptor
(b) Primary CO2 fixation product
(a) (b)
1. 5 3
2. 3 4
3. 3 5
4. 4 3
Read the following statements
Statement - I : Water splitting complex is located on the inner side of the thylakoid membrane.
Statement - II : During chemiosmosis breakdown of proton gradient releases energy.
1. Both I and II are incorrect.
2. I is correct but II is incorrect.
3. I is incorrect but II is correct.
4. Both I and II are correct.
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
Paraquat:-
1. Inhibits flow of from PSII to SPI.
2. Inhibits flow of from PSI to ferredoxin.
3. Inhibits flow of from PSII to plastoquinone.
4. Promotes flow of from PSI to ferredoxin.
Assertion: Dark reaction occur only at night in the stroma of chloroplast.
Reason: fixation occur only during cycle.
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |