R4RIN – MCQs, Mock Tests | Botany Botany MCQS[NEET-2021 to 2022]-Photosynthesis in Plants

Which among the following pigment absorbs the red and far red light ?

1. Cytochrome
2. Chlorophyll a
3. Chlorophyll c
4. Phytochrome

✅ Correct Answer: 4

Which among the following is a 4-C compound ?

1. Phosphoglyceric acid
2. Oxaloacetic acid
3. Ribulose biphosphate
4. Ribulose triphosphate

✅ Correct Answer: 2

Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants ?

1. Voilet and red
2. Violet and blue
3. red and blue
4. none

✅ Correct Answer: 2

The law of limiting factors was proposed with particular reference to photosynthesis. who among the following scientist proposed this law ?

1. Blackman
2. Weismann
3. Calvin
4. None

✅ Correct Answer: 1

Energy from light reaction to dark reaction in photosynthesis is transferred in the form of

1. ATP
2. ADP
3. DNA
4. RNA

✅ Correct Answer: 1

The shape of the chloroplast in higher plants is ?

1. Cup-shaped
2. Discoid
3. Reticulate
4. Girdle-shaped

✅ Correct Answer: 2

In C4 plants, the bundle sheath cells

1. Are rich in PEP carboxylase
2. Have large intercellular spaces
3. Have thin walls to facilitate gaseous exchange
4. None

✅ Correct Answer: 4

In C3 plants,which among the following is the first stable product of photosynthesis during the dark reaction is

1. 3-phosphoglyceric acid
2. Oxaloacetic acid
3. Phosphoglyceraldehyde
4. Acetic acid

✅ Correct Answer: 1

Hill reaction occurs in which of the following

1. Total darkness
2. Absence of water
3. Presence of ferricyanide
4. None

✅ Correct Answer: 3

Etiolation in plants is caused when

1. They have mineral deficiency
2. They are grown in intense light
3. They are grown in blue light
4. They are grown in dark

✅ Correct Answer: 4

During photorespiration, the conversion of phosphoglycolate to glycolate takes place in this cell organelle

1. Mitochondia
2. Chloroplast
3. Ribosome
4. Peroxisome

✅ Correct Answer: 2

Chloroplast dimorphism is a characteristic feature of

1. C4-Plants
2. Plants with Calvin cycle
3. All plants
4. None

✅ Correct Answer: 1

In Kranz anatomy the bundle sheath cells have ?

1. Thin walls, no intercellular spaces and several chloroplasts
2. Thick walls, no intercellular spaces and large number of chloroplasts
3. Thin walls, many intercellular spaces and no chloroplasts
4. Thick walls, many intercellular spaces and few chloroplasts

✅ Correct Answer: 2

Which among the following In photosystem-I, the first electron acceptor

1. An iron sulphur protein
2. Plastocyanin
3. Cytochrome
4. Chlorophyll

✅ Correct Answer: 1

Both photosynthesis and respiration require which of the following ?

1. Sunlight
2. Mitochondria
3. Chloroplast
4. None

✅ Correct Answer: 4

Bacterial photosynthesis involves the

1. PS- I
2. PS- II
3. Both A and B
4. None

✅ Correct Answer: 1

How many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C4-plants as compared to C-3 plant ?

1. 6
2. 8
3. 10
4. 12

✅ Correct Answer: 4

A process that makes important difference between C-3 and C-4 plants is

1. Guttaion
2. Transpiration
3. Photorespiration
4. Photosynthesis

✅ Correct Answer: 3

A plant with low CO2 compensation point is

1. Gossypium hirsutum
2. Tidestromia Oblongifolia
3. Leucopoa kingii
4. Atriplex patula

✅ Correct Answer: 2

Which among the following is not true about the light reactions of photosynthesis

1. P-680 and P-700 are the reaction centres of PS I an PS II respectively reactions
2. NADPH is not produced in cyclic electrons transport in light reactions
3. The flow of electrons from water to NADP in non-cyclic electron transport produces one ATP
4. None

✅ Correct Answer: 1

Which among the following statements regarding C-4 plants is false ?

1. The primary CO2 acceptor is a 5 carbon molecule
2. The primary CO2 acceptor is a 7 carbon molecule
3. Both A and B
4. The initial carboxylation reaction occurs in mesophyll

✅ Correct Answer: 3

Which among the following is wrongly matched ?

1. PS II Ã¢â‚¬â€œ P700
2. PEP carboxylase Ã¢â‚¬â€œ Mesophyll cells
3. Blackman Ã¢â‚¬â€œ Law of limiting factors
4. More than one option is correct

✅ Correct Answer: 1

The synthesis of 1 molecule of glucose during Calvin cycle requires a

1. 18 molecules of ATP and 12 molecules of NADPH2
2. 12 molecules of ATP only
3. 16 molecules of ATP and 12 molecules of NADPH2
4. None

✅ Correct Answer: 1

The pathway that will produce oxygen during photosynthesis is

1. noncyclic electron pathway
2. electron transport pathway
3. cyclic electron pathway
4. light-independent reactions

✅ Correct Answer: 1

The net requirement of assimilator power for the formation of 6 hexose molecules in maize plant is

1. 190 ATP, 74 NADPH
2. 180 ATP, 72 NADPH
3. 170 ATP, 70 NADPH
4. 160 ATP, 68 NADPH

✅ Correct Answer: 2

RuBisCO stands for

1. Ribulose phosphate carboxylase oxygenase
2. Ribulose phosphate carboxylic oxygenase
3. Ribulose bisphosphate carboxylase oxygenase
4. None

✅ Correct Answer: 3

Photosynthesis in C-4 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. Rubisco in C4 plants has higher affinity for CO2
4. None

✅ Correct Answer: 1

Which among the following is wrong in relation to photorespiration

1. It is a characteristic of C-4 plants
2. It occurs in daytime only
3. It is a characteristic of C-3 plants
4. It occurs in chloroplasts

✅ Correct Answer: 1

Which among the following is the best defined function of Manganese in green plants ?

1. Water absorption
2. Photolysis of water
3. Water absorption
4. Calvin cycle

✅ Correct Answer: 2

Which among the following enzyme is responsible for primary carboxylation in C-3 plants ?

1. RuBP carboxylase oxygenase
2. Succinic dehydrogenase
3. Hexokinase
4. None

✅ Correct Answer: 1

Which among the following is the first stable compound formed after CO2 fixation In C-3 plants?

1. Oxaloacetic acid
2. Malic acid
3. 3-phosphoglycerate
4. none

✅ Correct Answer: 3

Chemiosmosis hypothesis given by Peter Mitchel proposes the mechanism of

1. synthesis of ATP
2. synthesis of ADP
3. synthesis of NADH
4. None

✅ Correct Answer: 1

The ratio between 2-carbon and 3-carbon intermediates having -NH2 group formed in photosynthetic oxidation cycle is

1. 3:02
2. 4:02
3. 4:01
4. 2:01

✅ Correct Answer: 4

Continuity of cytoplasm from one cell to its neighbouring cells In higher plants is established through

1. Apoplas
2. Symplast
3. Chloroplast
4. Topoplast

✅ Correct Answer: 2

In CAM plants, CO2 required for photosynthesis enters the plant body during ?

1. Night when the hydathodes are open
2. Night through the stomata which are kept open
3. Daytime through the lenticels
4. Daytime when the stomata are open

✅ Correct Answer: 2

The concentration of organic acid in a CAM plant ?

1. increases during night
2. increases during day
3. decreases during night
4. decreases during any time

✅ Correct Answer: 1

Ganongs respiroscope is used to demonstrate

1. production of carbon dioxide during aerobic respiration
2. evolution of oxygen during photosynthesis
3. evolution of carbon dioxide during fermentation
4. production of heat during aerobic respiration

✅ Correct Answer: 1

Photosynthesis cannot continue for long if during light reaction, only cyclic photophosphorylation takes place. This is because of the following

1. There is no evolution of O2
2. There is unidirectional cyclic movement of the electrons
3. Photosystem I stops getting excited at a wavelength of light beyond 680 nm
4. None

✅ Correct Answer: 4

Who enunciated the law of limiting factor for photosynthesis ?

1. Blackman
2. Robert Emerson
3. Calvin
4. None

✅ Correct Answer: 1

Who among the following was discover the process of photophosphorylation ?

1. Blackman
2. Arnon
3. Robert Emerson
4. Ruben

✅ Correct Answer: 2

PGA as the first CO2 fixation product was discovered in photosynthesis of

1. Bryophyte
2. Alga
3. Angiosperm
4. Gymnosperm

✅ Correct Answer: 2

Which among the following is the end product of the Calvin cycle ?

1. ATP
2. RuBP
3. ADP
4. None

✅ Correct Answer: 2

Which among the following statement is true for ATP ?

1. ATP is a Co-enzyme
2. ATP is prosthetic part of an enzyme
3. ATP is an enzyme
4. ATP is organic ions of enzyme

✅ Correct Answer: 1

The metabolic pathway which produces carbohydrate is

1. Glycolysis
2. Cyclic electron pathway
3. Calvin cycle
4. none

✅ Correct Answer: 3

Glycolysis -

1. Reduces two molecules of NAD+ for every glucose molecule processed
2. Takes place in the mitochondria
3. Produces no ATP
4. Has no connection with electron transport chain

✅ Correct Answer: 1

In ___ NADP is converted into NADPH2

1. Cyclic photophosphorylation
2. Photolysis
3. Noncyclic photophosphorylation
4. Oxidative phosphorylation

✅ Correct Answer: 3

Which among the following doesnt play any role in photosynthesis ?

1. Phycocyanin
2. Anthocyanin
3. Phycoerythrin
4. none

✅ Correct Answer: 2

Where does bulk fixation of carbon through photosynthesis take place ?

1. Oceans
2. Crop plants
3. Tropical rain forests
4. none

✅ Correct Answer: 1

Which among the following substances yield less than 4 Kcal/mol when its phosphate bond is hydrolyzed ?

1. ATP
2. Creatine Phosphate
3. ADP
4. None

✅ Correct Answer: 4

Which among the following is the correct sequence of cell organelles during photorespiration ?

1. Mitochondria - Chloroplast - Peroxisome
2. Chloroplast - peroxisome Ã¢â‚¬â€œ mitochondria
3. Peroxisome - Chloroplast - Golgi Body
4. None

✅ Correct Answer: 2