For yielding one molecule of glucose, the Calvin cycle turns
1. two times
2. four times
3. six times
4. eight times
In C3-plants, the first stable product of photosynthesis during dark reaction is
1. PGALD
2. RuBP
3. PGA
4. OAA
The basic feature of typical C4 plants showing Kranz anatomy is the presence of
1. chloroplasts in mesophyll and epidermal cells
2. chloroplasts in bundle sheath cells
3. rudimentary chloroplasts in bundle sheath cells and typical chloroplasts with well-formed grana in mesophyll cells
4. typical chloroplasts with well formed grana in bundle sheath cells and rudimentary chloroplasts in the mesophyll cells
Which of the following is wrong in relation to photorespiration?
1. It is a characteristic of C4-plants
2. Phospho-glycolate is the initial substrate
3. It occurs in chloroplast
4. It occurs during daytime only
Which of the following is correct for the diagram given below-
1. D is involved in the creation of proton gradient across the membrane
2. A is involved in the photolysis of water
3. C is also called PS II
4. F0-F1 are a part of B
Read the given statements and choose the correct option
A. Like dark reactions, light reactions are also temperature sensitive.
B. plants respond to lower temperatures and show higher rate of photosynthesis.
1. Only A is correct.
2. Only B is correct.
3. Both A and B are incorrect.
4. Both A and B are correct.
In plants, bundle sheath cells are characterised by how many features given below?
I. Large cells.
II. Having large number of agranal chloroplasts.
III. Thin walled.
IV. Impervious to gaseous exchange.
V. Presence of intercellular space.
1. 5
2. 4
3. 2
4. 3
Who described the first action spectrum of photosynthesis by using an alga Cladophora, a prism and aerobic bacteria in an experiment?
1. Jan Ingenhousz.
2. T.W. Engelmann.
3. Joseph Priestley.
4. C. Van Niel.
Choose the events which correctly differentiate non-cyclic photophosphorylation from cyclic photo
phosphorylation.
A. Requirement of an external electron donor.
B. Synthesis of ATP.
C. Photolysis of water.
D. Involvement of PS I.
E. Formation of NADPH.
1. A, B and C only
2. B, C, D and E
3. A, C and E only
4. A, B, C and E
Immediate donor of electrons to PS I is
1. Phaeophytin
2. Cyt
3. Plastocyanin
4. Plastoquinone
In cycle, fixation of one requires
1. 5ATP + 2NADPH
2. 5ATP + 3NADPH
3. 3ATP + 3NADPH
4. 3ATP + 2NADPH
The primary acceptor molecule during cycle is a
(a) Five carbon keto-sugar.
(b) Three carbon aldo-sugar.
(c) Five carbon aldo-sugar.
(d) Three carbon keto-sugar.
Dimorphic chloroplasts are found in
1. Wheat
2. Rice
3. Maize
4. Pea
Which of the following plants has scotoactive stomata?
1. Opuntia
2. Cuscuta
3. Sugarcane
4. Rice
Choose the correct statement
1. pathway is a slower process of carbon fixation than pathway.
2. 6 ATP are consumed to fix one via pathway.
3. The first stable product is a 4C compound in pathway.
4. The primary acceptor of is PEP in pathway.
Which one is not a correct statement with respect to cyclic photophosphorylation?
1. It occurs mostly in stroma lamellae membrane.
2. It operates under high light intensity and aerobic conditions only.
3. It operates when availability is poor.
4. It does not take part in photosynthesis except for certain bacteria.
Organism belonging to which kingdom was first time used to hypothesized that all photosynthetic organisms require a source of hydrogen
1. Plantae
2. Protista
3. Monera
4. Fungi
Which of the following is not correct about stroma lamellae
1. It lacks PS – II.
2. Enzyme NADP – reductase is absent.
3. Only site of cyclic – photophosphorylation.
4. Contains chlorophyll pigment as well.
Following are the statements related to Dark reaction, how many of them are correct?
I. RuBP is always one of the acceptor molecule of .
II. In some plants dark reaction is affected by high internal concentration.
III. If supply of light is cut dark reaction stops immediately.
IV. Dark reaction is fast when non-cyclic photophosphorylation is stopped.
Option :
1. 1
2. 2
3. 3
4. 4
The electron flow from PSll to NADP via ETS and PSl follows
1. Uphill Downhill → Uphill → Downhill.
2. Downhill → Uphill → Downhill → Uphill.
3. Downhill → uphill → Uphill → Downhill.
4. Uphill → Downhill → Downhill → Uphill.