R4RIN – MCQs, Mock Tests | NCERT Class 11 MCQ Questions for Class 11 Biology sets 3

Dry seeds kept in water swell due to

1. absorption
2. diffusion
3. imbibition
4. None of these

✅ Correct Answer: 3

Choose the correct statement/statements. Pumps in active transport are A. Lipids that bind molecules to pass them through the membrane. B. Transport molecules uphill. C. These are specific transporters. D. These are sensitive to inhibitors.

1. A and C
2. A, B and D
3. B, C and D
4. C and D

✅ Correct Answer: 3

Which of the following is the unit of ψ?

1. Pascal
2. Joule
3. Newton
4. Electron volt

✅ Correct Answer: 1

Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be:

1. No movement of water
2. Movement of water from cell B to A
3. Movement of water from cell A to B
4. Equilibrium between the two

✅ Correct Answer: 3

Which of the following is decreased during increase in humidity in the atmosphere?

1. Transpiration
2. Photosynthesis
3. Respiration
4. Glycolysis

✅ Correct Answer: 1

Ψs is always

1. positive
2. zero
3. negative
4. one

✅ Correct Answer: 3

Two types of molecules cross the membrane in the same direction, it is called as

1. Uniport
2. Symport
3. Antiport
4. Multiport

✅ Correct Answer: 2

Diffusion rate is affected by

1. temperature
2. membrane permeability
3. gradient of concentration
4. All of these

✅ Correct Answer: 4

Cells shrink in _________ solution.

1. isotonic
2. hypotonic
3. hypertonic
4. hypotonic and hypertonic

✅ Correct Answer: 3

Which of the following is true about diffusion?

1. There is no expenditure of energy.
2. Molecules move in Brownian motion
3. Substances moves from the region of higher concentration to the region of lower concentration.
4. Diffusion depends on the type of living system.

✅ Correct Answer: 4

If pressure greater than atmospheric pressure is applied to pure water, the water potential

1. increases
2. decreases
3. remains same
4. atmospheric pressure does not affect water potential

✅ Correct Answer: 1

Choose the correct sequence of water movement in the plants.

1. Cortex, protoxylem, endodermis, root hair, pericycle, metaxylem
2. Root hair, cortex, endodermis, pericycle, protoxylem, metaxylem
3. Root hair, protoxylem, metaxylem, pericycle, cortex, endodermis
4. Root hair, pericycle, endodermis, cortex, protoxylem, metaxylem

✅ Correct Answer: 2

Wilting of a plant results from excessive

1. respiration
2. photosynthesis
3. absorption
4. transpiration

✅ Correct Answer: 4

Cohesion theory of water movement in plants was put forth by

1. Henry Dixon
2. F. F. Blackman
3. Melvin cycle
4. Hans. A. Krebs

✅ Correct Answer: 1

When a plant is girdled (ringed)

1. the root and shoot die at the same time
2. neither root nor shoot will diet first
3. the root dies first
4. neither root nor shoot will die

✅ Correct Answer: 3

Assertion (A): K+ ion accumulation found in Nitella depends on its respiratory activity. Reason (R): Absorption of all ions in plants completely depends on the usage of metabolic energy. The correct answer is

1. A and R are true and R is the correct explanation of A
2. A and R are true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

✅ Correct Answer: 3

In plants, a common symptom caused by deficiency of P, K, Ca and Mg is the

1. bending of leaf tip
2. formation of anthocyanins
3. poor development of vasculature
4. appearance of dead necrotic tissue

✅ Correct Answer: 4

Function of zinc is

1. Closing of stomata
2. Biosynthesis of 3-IAA
3. Synthesis of chlorophyll
4. Oxidation of carbohydrate

✅ Correct Answer: 3

Which of the following is a group of micronutrients?

1. Ca, Zn, B
2. Fe, Mn, Cu
3. Cl, C, Ca
4. Ni, Mo, H

✅ Correct Answer: 2

The process of conversion of NO2– to N2 is called

1. nitrification
2. ammonification
3. denitrification
4. nitrogen fixation

✅ Correct Answer: 3

The formation of first stable product of nitrogen fixation is catalysed by enzyme

1. dehydrogenase
2. nitrogenase
3. isomerase
4. None of these

✅ Correct Answer: 2

Manganese toxicity leads to deficiency of

1. iron
2. calcium
3. magnesium
4. All of the above

✅ Correct Answer: 4

Chlorosis will occur if a plant is grown in

1. dark
2. shade
3. strong light
4. Fe – free medium

✅ Correct Answer: 4

Choose the correct function of magnesium.

1. It is a constituent of several coenzyme.
2. It activates the enzymes of respiration and photosynthesis.
3. It activates enzyme catalase
4. It helps in maintaining anion-cation balance.

✅ Correct Answer: 2

Mineral salts which are absorbed by the roots from soil are in the form of

1. Dilute solution
2. Very concentrated solution
3. Concentrated solution
4. Very dilute solution

✅ Correct Answer: 4

Which one of the following mineral elements plays an in biological nitrogen fixation?

1. Copper
2. Manganese
3. Zinc
4. Molybdenum

✅ Correct Answer: 4

Oxygen scavangers present in root nodules of legumes is

1. haemoglobin
2. leg haemoglobin
3. cyano haemoglobin
4. None of these

✅ Correct Answer: 2

Which one of the following is not a micronutrient?

1. Magnesium
2. Molybdenum
3. Boron
4. Zinc

✅ Correct Answer: 1

Which of the following is not a macronutrient

1. iron
2. calcium
3. manganese
4. phosphorus

✅ Correct Answer: 3

Insectivorous plants grow where

1. There is carbohydrate deficient soil
2. There is nitrogen deficient soil
3. Vitamin c is required
4. Hormones are required

✅ Correct Answer: 2

Phytotron is meant for

1. Controlled humidity
2. Induction of mutations
3. Controlled irradiation
4. Growing plants under controlled environment

✅ Correct Answer: 4

Toxicity of which element leads to the appearance of brown spots on leaves

1. Mg
2. Mn
3. Fe
4. Cu

✅ Correct Answer: 2

Presence of phosphorus

1. brings about healthy root growth
2. promotes fruit ripening
3. retards protein formation
4. None

✅ Correct Answer: 3

Which element is required for opening and closing of stomata?

1. P
2. K
3. Ca
4. Na

✅ Correct Answer: 2

Exanthema is due to deficiency of

1. B
2. Mo
3. Mn
4. Cu

✅ Correct Answer: 4

NPK denotes

1. Nitrogen, Protein, Kinetin
2. Nitrogen, Protein, Potassium
3. Nitrogen, Potassium, kinetin
4. Nitrogen, Phosphorus, Potassium

✅ Correct Answer: 4

The rate of photosynthesis is controlled by

1. he rate of light reaction
2. the rate of dark reaction
3. the rates of both light and dark reactions
4. None of these

✅ Correct Answer: 2

The end product of the Calvin cycle is ______.

1. RuBP
2. PGAL
3. PGA
4. ADP + NADP

✅ Correct Answer: 1

The primary carbon dioxide acceptor in C4 cycle is

1. malic acid
2. phosphoenol pyruvate
3. rubisco
4. aspartic acid

✅ Correct Answer: 2

The law of limiting factor was given by

1. Calvin
2. Blackman
3. Priestley
4. None of these

✅ Correct Answer: 2

Manganese is required in

1. Chlorophyll synthesis
2. Nucleic acid synthesis
3. Plant cell wall formation
4. Photolysis of water during photosynthesis

✅ Correct Answer: 4

Which of the following is not an accessory pigment?

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

✅ Correct Answer: 2

Besides water and CO2, which is more essential a raw material for food formation

1. light
2. oxygen
3. NAD
4. mineral salt

✅ Correct Answer: 1

In actively gro – wing young plants, the best data for estimating the rate of photosynthesis would be

1. ratio of oxygen evolved to carbon dioxide absorbed
2. increase in fresh weight
3. increase in dry weight
4. increase in carbohydrate

✅ Correct Answer: 1

Discovery of Emerson effect has already shown the

1. two distinct photochemical reactions
2. light and dark reactions of photosynthesis
3. photophosphorylation
4. photorespiration

✅ Correct Answer: 1

Translocation of sugar in flowering plants occurs in the form of

1. glucose
2. sucrose
3. starch
4. maltose

✅ Correct Answer: 2

Where are thylakoids and grana located?

1. Lysosomes
2. Mitochondria
3. Chloroplasts
4. Golgi apparatus

✅ Correct Answer: 3

Who enunciated the law of limiting factor for photosynthesis?

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

✅ Correct Answer: 3

Who enunciated the law of limiting factor for photosynthesis?

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

✅ Correct Answer: 3

Which one of the following statement is true for ATP?

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

✅ Correct Answer: 4

Kranz anatomy is a feature of

1. C3 plants
2. CAM plants
3. C4 plants
4. All of these

✅ Correct Answer: 3

Which of the following is a 4-carbon compound?

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

✅ Correct Answer: 1

Which of the following process (C4 cycle) occurs in bundle sheath cells?

1. Regeneration
2. Fixation
3. Carboxylation
4. Decarboxylation

✅ Correct Answer: 4

Light reactions of photosynthesis occurs in

1. stroma
2. thylakoid
3. grana
4. cytoplasm of cell

✅ Correct Answer: 3

Water stress causes

1. opening of stomata
2. increase in metabolic rate
3. wilting of leaves
4. lesser availability of carbon dioxide

✅ Correct Answer: 3

R.Q is ratio of

1. CO2 produced to substarate consumed
2. CO2 produced to O2 consumed
3. oxygen consumed to CO2 produced
4. oxygen consumed to water produced

✅ Correct Answer: 2

Angiosperm pollen is generally released at the

1. 1 – celled stage
2. 2 – celled stage
3. 3 – celled stage
4. male gamete formation stage

✅ Correct Answer: 2

The complete oxidation of pyruvate take place in

1. cell cytoplasm
2. inner mitochondrial membrane
3. mitochondrial matrix
4. nucleus

✅ Correct Answer: 3

Which enzyme catalyses the reaction below? Pyruvic acid → Carbon dioxide + Ethanol

1. Pyruvic acid decarboxylase
2. Alcohol dehydrogenase
3. None of these
4. Both of these

✅ Correct Answer: 4

TCA cycle was discovered by

1. Otto Meyerhof
2. Hans Kreb
3. Gustav Embden
4. All of these

✅ Correct Answer: 2

Which one of the following describes the spikelet of a cereal or grass plant

1. inferior ovary
2. dehiscent fruit
3. pair of glumes
4. fused calyx

✅ Correct Answer: 3

Malacophily means

1. pollination by wind
2. pollination by water
3. pollination by insects
4. pollination by snails

✅ Correct Answer: 4

Herkogamy is a contrivance for

1. allogamy
2. autogamy
3. chasmogamy
4. cleistogamy

✅ Correct Answer: 1

Out of 36 ATP molecules produced per glucose molecule during respiration

1. 2 are produced outside glycolysis and 34 during repiratory chain
2. 2 are produced outside mitochondria and 34 inside the mitochondria
3. all the formed inside mitochondria
4. 2 during glycolysis and 34 during kreds cycle

✅ Correct Answer: 2

Complete the reaction. _________ + O2 → CO2 + _______ + Energy

1. C6H12O6, 2H2O
2. C12H22O11, 6H2O
3. C6H12O6, 6H2O
4. C12H22O11, 11H2O

✅ Correct Answer: 3

The significant morphological feature of passion flower is the presence of

1. numerous corolla
2. androphore
3. gynophore
4. androgynophore

✅ Correct Answer: 2

The final electron acceptor in electron transport chain is

1. Cytochrome C
2. FADH
3. NADH
4. oxygen

✅ Correct Answer: 4

Which of the following acts as mobile carrier for transfer of electrons between complex III and complex IV?

1. Cytochrome c
2. cytochrome a3
3. cytochrome a
4. FADH2

✅ Correct Answer: 1

Aleurone layer takes part in

1. protection of delicate embryo
2. enzyme synthesis
3. transfer of food to cotyledons
4. transfer of food from cotyledons to embryo tips

✅ Correct Answer: 2

A characteristic of drupe is

1. fleshy seed coat
2. stony pericarp
3. stony mesocarp
4. stony endocarp

✅ Correct Answer: 4

Incomplete oxidation of glucose into pyruvic acid with several intermediate steps is know as

1. TCA pathway
2. Glycolysis
3. Hms pathway
4. Glycolysis

✅ Correct Answer: 2

End product of glycolysis is

1. acetyl Coenzyme A
2. PEP
3. pyruvate
4. OAA

✅ Correct Answer: 3

Respiratory quotient of carbohydrates is

1. 0.9
2. 1.2
3. 1
4. 0

✅ Correct Answer: 3

One molecule of glucose yields ___ ATP molecules in aerobic respiration.

1. 2
2. 16
3. 38
4. 42

✅ Correct Answer: 3

Typical plant growth shows _________ curve

1. J-shaped
2. S-shaped
3. I-shaped
4. Parabolic

✅ Correct Answer: 2

Exponential growth of the plants is express as W1 = W0 ert r represents

1. ability of the plant to produce new cells
2. efficiency index
3. relative growth rate
4. All of the above

✅ Correct Answer: 4

Opening of floral buds into flowers, is a type of:

1. Autonomic movement of variation
2. Autonomic movement of locomotion
3. Autonomic movement of growth
4. Paratonic movement of growth

✅ Correct Answer: 3

Plants grow throughout their life due to

1. presence of meristems
2. presence of vascular cambium
3. presence of xylem and phloem
4. presence of tracheids

✅ Correct Answer: 1

Which one of the followings is a gaseous plant hormone?

1. Ethylene
2. Gibberellin
3. IAA
4. Abscisic acid

✅ Correct Answer: 1

To prevent over – ripening, bananas should be

1. given a dip in ascorbic acid
2. maintained at room temperature
3. refrigerated
4. stored at the top of refrigerator

✅ Correct Answer: 3