laboursonline – MCQs, Mock Tests | Biology Biology MCQ Question

Which of the following is a chemical link between catabolism and anabolism?

1. AMP
2. ADP
3. ATP
4. All of these

✅ Correct Answer: 3

Photosynthesis is process in which ________ compounds of carbon (CO2) and hydrogen (H2O) are reduced to carbohydrate like (glucose) using light energy.

1. Organic
2. Energy rich
3. Energy poor
4. Reduced

✅ Correct Answer: 3

C6H12O6 + 6O2 ? 6CO2 + 6H20 + ENERGY represents:

1. Photosynthesis
2. Aerobic respiration
3. Anaerobic respiration
4. Respiration

✅ Correct Answer: 2

At which times there is no net gaseous exchange between leaves and the atmosphere.

1. Day time.
2. Night time.
3. Dawn & Dusk.
4. Mid night.

✅ Correct Answer: 3

Which of the following is a compensation point:

1. Leaves respire and utilize O2 and release CO2.
2. Photosynthesis and respiration occur at same rate. So there is not net exchange of gases between atmosphere and plants.
3. Rate of photosynthesis increases, so do the O2 production, with a net release of oxygen coupled with the uptake of CO2.
4. Rate of respiration becomes more than rate of photosynthesis.

✅ Correct Answer: 2

Quantitative study of energy relationships in biological systems obeys.

1. Bioenergetics
2. Laws of thermodynamics
3. Laws of thermo chemistry
4. Laws of chemical energetic

✅ Correct Answer: 2

The organisms able to use sunlight directly as a source of energy are

1. Plants
2. Animals
3. Omnivores
4. Fungi

✅ Correct Answer: 1

Net yield of H2O in Photosynthesis is

1. 1 molecule
2. 6 molecules
3. 3 molecules
4. 0 molecule

✅ Correct Answer: 4

The point at which there is no net exchange of gases between leaves and atmosphere is known as

1. Neutral point
2. Compensation point
3. Parallel point
4. Competitive point

✅ Correct Answer: 2

Van neil hypothesis about the production of oxygen during phosynthesis was based on the study and investigations on

1. Bacteria
2. Algae
3. Protenema
4. Cyanobacteria

✅ Correct Answer: 1

Visible light used in photosynthesis ranges from:

1. 300 - 700 nm in wavelength
2. 350 - 750 nm in wavelength
3. 380 - 750 nm in wavelength
4. 390 - 790 nm in wavelength.

✅ Correct Answer: 3

Which of the following light is least absorbed by the plants:

1. Orange
2. Red
3. Blue
4. Green

✅ Correct Answer: 4

Which of the light is mainly absorbed by the plants:

1. Orange
2. Red
3. Green
4. Both A and B

✅ Correct Answer: 4

Chlorophyll is insoluble in:

1. Carbon tetrachloride
2. Alcohol
3. Organic solvents
4. Water

✅ Correct Answer: 4

Which of the following statement about the head of a chlorophyll molecule is incorrect:

1. It is a porphyrin ring or tetrapyrrole ring structure
2. It is flat, square and light absorbing
3. Composed of carbon and nitrogen atoms with Magnesium as central metal ion, which is coordinated with nitrogen.
4. It is hydrophobic

✅ Correct Answer: 4

Which of the following pigment is Blue- green in colour:

1. Chlorophyll a
2. Chlorophyll b.
3. Chlorophyll c
4. Chlorophyll d.

✅ Correct Answer: 1

Which is the correct order of energy transfer from assessory pigments to main photosynthetic pigment?

1. Carotenoids ? Chlorophyll a ? Chlorophyll b.
2. Chlorophyll b ? Carotenoids ? Chlorophyll a.
3. Carotenoids ? Chlorophyll b ? Chlorophyll a.
4. Chlorophyll a ? Chlorophyll b ? Carotenoids.

✅ Correct Answer: 3

Light reaction takes place on/in

1. Thylakoid
2. Storma
3. Chloroplast
4. Grana

✅ Correct Answer: 4

Thylakoids in chloroplasts are stacked into

1. Grana
2. Stroma
3. Nucleus
4. None of these

✅ Correct Answer: 1

In all plants the major sites of phosynthesis are

1. Leaves respire and utilize O2 and release CO2.
2. Stems
3. Roots
4. Branches

✅ Correct Answer: 1

The dense fluid filled region in the chloroplast is

1. Grana
2. Stroma
3. Thylakoid
4. None of these

✅ Correct Answer: 2

Chlorophylls are found embedded in the ______ membranes

1. Stroma
2. Grana
3. Thylakoid
4. Intergrana

✅ Correct Answer: 3

Xanthophylls are ______ pigments

1. Yellow
2. Red
3. Orange
4. Green

✅ Correct Answer: 1

Chlorophylls mainly absorb ____ wavelengths

1. Orange - blue
2. Violet - red
3. Yellow - orange
4. Orange - red.

✅ Correct Answer: 4

Deficiency of ________ causes yellowing in plants

1. Magnesium
2. Iron
3. Chlorine
4. Oxygen

✅ Correct Answer: 1

The chlorophyll molecule is embedded in the core of thylakoid membrane which acts as

1. Hydrophilic
2. Hydrophobic
3. Both of these
4. None of these

✅ Correct Answer: 2

The most important photosynthetic pigment

1. Chlorophyll a
2. Chlorophyll b
3. Xanthophyll
4. Carotenes

✅ Correct Answer: 1

Bacteriochlorophylls does not include

1. Chlorophyll e
2. Chlorophyll d
3. Chlorophyll a
4. Chlorophyll c

✅ Correct Answer: 3

Molecular formula of chlorophyll b is

1. C55 H10 O4 N6 Mg
2. C55 H70 O6 N5 Mg
3. C55 H71 O6 N4 Mg
4. C55 H70 O6 N4 Mg

✅ Correct Answer: 2

Carotenoids perform protective function in

1. Animals
2. Plants
3. Both of these
4. None of these

✅ Correct Answer: 3

About _______ % of photosynthesis is carried by terrestrial plants, while rest occurs in ocean, lakes, and ponds.

1. 10%
2. 20%
3. 30%
4. 40%

✅ Correct Answer: 1

Air contains ______ % of CO2

1. 0.02-0.03
2. 0.03-0.04
3. 0.04-0.05
4. 0.05-0.06

✅ Correct Answer: 2

PS I has chlorophyll a molecule which absorbs maximum light of _____ nm.

1. 600
2. 650
3. 680
4. 700

✅ Correct Answer: 4

The percentage of light absorbed by the leaf

1. 20%
2. 15%
3. 10%
4. 1%

✅ Correct Answer: 4

The first action spectrum was obtained by

1. T.W.Englemam
2. Malleus
3. T.W.Inws
4. W.Stapes

✅ Correct Answer: 1

First Actions spectrum was obtained by using

1. Algae
2. Fungi
3. Bacteria
4. Spirogyra

✅ Correct Answer: 4

Of the following, which one causes higher production of food in green plants

1. Blue
2. Orange
3. Red
4. Violet

✅ Correct Answer: 3

Photosynthesis carried out by terrestrial plants is ____ of total photosynthesis.

1. 1-2%
2. 5%
3. 10%
4. 20%

✅ Correct Answer: 3

Stomata cover only _________ of leaf surface.

1. 0.03 - 0.04%
2. 10%
3. 1-2 %
4. 50%

✅ Correct Answer: 3

Reduction in photosynthesis is of

1. O2
2. CO2
3. H2O
4. light energy

✅ Correct Answer: 2

NADPH2 provides

1. assimilatory power
2. chemical energy
3. energized electrons
4. All of these

✅ Correct Answer: 4

Of the following, which one light - gathering

1. Antenna complex
2. Reaction centre
3. Photosystem
4. None of these

✅ Correct Answer: 1

Photosystem II has molecules which absorbs maximum light of

1. 680 nm
2. 100 m
3. 700 nm
4. 670 nm

✅ Correct Answer: 1

Glycolysis takes place in:

1. Nucleus
2. Cytosol
3. Mitochondria
4. Ribosomes

✅ Correct Answer: 2

Complete breakdown of glucose molecule takes place in which of the following:

1. Alcoholic fermentation
2. Lactic acid fermentation
3. Aerobic respiration.
4. All of these

✅ Correct Answer: 3

In alcoholic fermentation Pyruvic acid is broken down into:

1. Acetaldehyde
2. Methyl alcohol
3. Ethyl alcohol.
4. Lactic acid.

✅ Correct Answer: 3

In which of the following component of the body, lactic acid fermentation takes place:

1. Brain
2. Heart
3. Liver
4. Muscles

✅ Correct Answer: 4

In Anaerobic respiration only _____ % of the energy present within the chemical bond of glucose is converted into ATP.

1. 1%
2. 2%
3. 3%
4. 4%

✅ Correct Answer: 2

Biology MCQ Quiz Hub

Biology MCQ Question - Bioenergetics