R4RIN – MCQs, Mock Tests | Biology Biology MCQS[NEET-2021 to 2022]-Plant anatomy mcq for competitive exams

Which is not related to transpiration?

1. Absorption and distribution of minerals
2. Circulation of water
3. Temperature
4. Bleeding

✅ Correct Answer: 4

Difference between osmotic pressure and turgor pressure is

1. DPD
2. Transpiration pull
3. Osmotic potential
4. Solute potential

✅ Correct Answer: 1

Path of water movement from soil to xylem is

1. Metaxylem &#8594; Protoxylem &#8594; Cortex &#8594; Soil &#8594; Root hair
2. Pericycle &#8594; Soil &#8594; Root hair &#8594; Cortex &#8594; Endodermis
3. Soil &#8594; Root hair &#8594; Cortex &#8594; Endodermis &#8594; Pericycle
4. Cortex &#8594; Root hair &#8594; Endodermis &#8594; Pericycle &#8594; Proto

✅ Correct Answer: 3

Assertion Dried seeds of Pea are kept in tin, water is poured over them up to upper level. A lid is put tight over it. Within an hour the lid is blown off Reason Due to rapid cell division in Pea see

1. If both the assertion and reason are true and reason explains the assertion
2. If both the assertion and reason are true but reason does not explain the a
3. If assertion is true but reason is false
4. If assertion is false but reason is true.

✅ Correct Answer: 3

Guttation is mainly due to

1. Root pressure
2. Osmosis
3. Transpiration
4. Imbibition

✅ Correct Answer: 1

Which one is not connected with transport across the cell membrane

1. Osmosis
2. Active transport
3. Diffusion
4. Surface tension

✅ Correct Answer: 4

A semipermeable membrane allows the diffusion of

1. Solutes
2. Solvents
3. Both solutes and solvents
4. None of the above

✅ Correct Answer: 2

Exchange of substances between a cell and its environment is due to

1. Diffusion
2. Osmosis
3. Active transport
4. All of the above

✅ Correct Answer: 4

Mannitol is storage food in

1. Chara
2. Gracilaria
3. Porphyra
4. Fucus

✅ Correct Answer: 4

Which of the following is a synthetic auxin?

1. IAA
2. NAA
3. IBA
4. ABA

✅ Correct Answer: 2

Function of red pigment leghaemoglobin present in root nodules of leguminous plants is to regulate

1. Co2 supply in cells
2. Mo supply to cells
3. O2 suplly to cells
4. None of the above

✅ Correct Answer: 3

Essential macronutrients are

1. Manufactured during photosynthesis
2. Produced by growth hormones
3. Absorbed by soil
4. Produced by enzymes

✅ Correct Answer: 3

Gene responsible for nitrogen fixation is

1. Nif
2. Nitrogenase
3. Yeast alanine tRNA synthatase
4. RNA synthatase

✅ Correct Answer: 1

An essential element is that which

1. Is found in plant ash
2. Is available in soil
3. Improves health of plant
4. Is irreplaceable and indispensable for growth of plants

✅ Correct Answer: 4

Denitrification is carried out by

1. Nitrosomonas
2. Nitrosococcus
3. Nitrobacter
4. Pseudomonas

✅ Correct Answer: 4

Which plant hormone plays an important role in seed dormancy and germination respectively

1. Abscisic acid and Gibberellic acid
2. Ethylene and Abscisic acid
3. Ethylene and Gibberellic acid
4. Gibberellic and Ethylene acid

✅ Correct Answer: 1

Plants absorb nitrogen as

1. Nitrate
2. Nitrite
3. Ammonia and urea
4. All of the above

✅ Correct Answer: 1

The conditions necessary for vernalization are: (i) High temperature and water. (ii) Low temperature and water. (iii) Water and Carbon dioxide. (iv) Oxygen and water.

1. (i), (ii) and (iii)
2. (i) and (ii)
3. (ii) and (iv)
4. (i) and (iii)

✅ Correct Answer: 3

Function of leghaemoglobin during biological nitrogen fixation in root nodules of legumes is to

1. Convert atmospheric nitrogen to ammonia
2. Convert ammonia to nitrite
3. Transport oxygen for activity of nitrogenase
4. Protect nitrogenase from oxygen

✅ Correct Answer: 4

Auxins are mainly produced by

1. Root apical meristem
2. Shoot apical meristem
3. Lateral meristem
4. Intercalary meristem

✅ Correct Answer: 2

Active transport occurs

1. Against concentration gradient and requires ATP
2. Against concentration gradient but does not require ATP
3. Along concentration gradient but requires ATP
4. Along concentration gradient but does not require ATP

✅ Correct Answer: 1

Plant hormone associated with climacteric respiration:

1. Auxin
2. Caytokinin
3. Ethylene
4. Gibberellin

✅ Correct Answer: 3

Element which is a component of proteinaceous materials and protoplasm is

1. Potassium
2. Magnesium
3. Nitrogen
4. Oxygen

✅ Correct Answer: 3

Minerals are absorbed in the form of

1. Compounds
2. Minerals
3. Ions
4. Mixtures

✅ Correct Answer: 3

Choose the wrong pair:

1. Auxin - to grow
2. Gibberllin - acidic
3. Caytokinin - cell divisen
4. ABA - Flowring hormons

✅ Correct Answer: 2

Assertion: Nitrogen fixing bacteria of legume root nodules survive in oxygen depleted cells. Reason: Leghaemoglobin completely removes oxygen from nodule cells

1. If both the assertion and reason are true and reason explains the assertion
2. If both the assertion and reason are true but reason does not explain the a
3. If assertion is true but reason is false
4. If assertion is false but reason is true.

✅ Correct Answer: 3

Plant ash indicates

1. Silica absorbed by plants
2. Both mineral salts and organic matter
3. Mineral salt absorbed by plants
4. Organic matter of plant

✅ Correct Answer: 3

Nitrifying bacteria convert

1. Ammonia to nitrate
2. Nitrogen into soluble form
3. Nitrate to nitrogen
4. Ammonia to nitrogen

✅ Correct Answer: 1

The enzymes required for nitrogen fixation is

1. Nitrogen deaminase
2. Nitrodioxidase
3. Amino acid decarboxylase
4. Nitrogenase

✅ Correct Answer: 4

Photoperiodism is:

1. Germination of seed
2. Elongation of internodes
3. Flowering response towards light
4. Vegetative growth.

✅ Correct Answer: 2

Which group of three micronutrient elements affect both photosynthetic and mitochondrial electron transport?

1. Cu, Mn, Fe
2. Co, Ni, Mo
3. Ca, K, Na
4. Mn, Co, Ca

✅ Correct Answer: 1

Count the number of true statements: (i) Application of gibberellins help early seed production in conifers. (ii) All synthetic auxins are widely used as herbicides. (iii) Kinetin promotes cytokin

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

✅ Correct Answer: 3

Inorganic nutrients are present in the soil as

1. Atoms
2. Molecules
3. Epectrically charged ions
4. Colloids

✅ Correct Answer: 3

Find out the true statements about vernalization: (i) It is the promotion of flowering by a period of low temperature (ii) It prevents precocious reproductive development early in the growing season

1. (i), (ii) and (iii).
2. (i) and (iii).
3. (ii) (iii) and (iv)
4. (i), (iii) and (iv)

✅ Correct Answer: 4

Yield of Rice increase by

1. Sesbania
2. Anabaena
3. Bacillus subtilis
4. B. popilliae

✅ Correct Answer: 2

Which one is not a micronutrient?

1. B
2. Mo
3. Zn
4. Mg

✅ Correct Answer: 4

Read the following statements: (i) Cytokinin help in lateral shoot growth. (ii) Ethylene influences horizontal growth of seedlings. (iii) ABA plays an important role in seed development. (iv) Ethy

1. (i), (ii) and (iii) are correct.
2. (iii) and (iv) are correct
3. (ii), (iii) and (iv) are correct
4. (ii) and (iii) are correct

✅ Correct Answer: 1

Bacteria that convert ammonia to nitrite belong to

1. Nitrosomonas
2. Nitrobacter
3. Mycobacterium
4. Pseudomonas

✅ Correct Answer: 1

One hormone promotes abscission of flowers while the other delay senescence of fruits. These are respectively:

1. Auxin and Cytokinin.
2. Ethylene and Abscisic acid
3. Abscisic acid and Ethylene
4. Ethylene and Gibberellic acid

✅ Correct Answer: 4

Brown heart disease is due to deficiency of

1. Boron
2. Iron
3. Potassium
4. Molybdenum

✅ Correct Answer: 1

Flowering in short day plants is induced by

1. Short days and interrupted long nights
2. Short days and uninterrupted long nights
3. Long days and interrupted short nights
4. Long days and uninterrupted short nights

✅ Correct Answer: 2

Carbohydrates, the most abundant biomolecules on earth are produced by

1. Some bacteria, algae and green plants
2. Fungi, algae and green plants
3. Viruses, fungi and bacteria
4. All bacteria, fungi and algae

✅ Correct Answer: 1

Arithmetic growth curve is linear because

1. One daughter cell remains meristematic and others differentiates and mature
2. Both daughter cells remains meristematic
3. ) Both daughter cells get matured
4. None of the above

✅ Correct Answer: 1

Optimum temperature for photosynthesis is

1. 35Â° - 40Â°C
2. 25Â° - 35Â°C
3. 20Â° - 25Â°C
4. 10Â° - 15Â°C

✅ Correct Answer: 3

Primary carboxylation occurs in C 3 and C 4 plants with the help of

1. PEP carboxylase and pyruvate carboxylase
2. PEP carboxylase and RuBP carboxylase
3. RuBP carboxylase and PEP carboxylase
4. RuBP carboxylase and pyruvate carboxylase

✅ Correct Answer: 3

In which type reactions related to plant photosynthesis, peroxisomes are involved

1. Glycolytic cycle
2. Calvin cycle
3. Bacterial photosynthesis
4. Glyoxylate cycle

✅ Correct Answer: 1

On the basis of the information mentioned, select the correct name of phytohormones for a,b and c respectively: (i) Hormone (a) helps in initiation of root and root hair formation at low concentratio

1. a-auxin, b-Gibberellin, c-Ethylene
2. a-Cytokinin, b-Zeatin, c-ABA
3. a-IAA, b-Ethylene, c-Cytokinin.
4. a-Ethylene, b-Gibberellin, c-ABA.

✅ Correct Answer: 3

Electrons lost by PS II are regained from

1. CO2
2. O2
3. H2O
4. None of the above

✅ Correct Answer: 3

In geometrical growth (from beginning to last), the correct sequence of growth phases and their occurrence are:

1. Log phase &#8594; Lag phase &#8594; Asymptote
2. Asymptote &#8594; Log phase &#8594; Lag phase
3. Lag phase &#8594; Exponential phase &#8594; Asymptote
4. Lag phase &#8594; Exponential phase &#8594; Log phase.

✅ Correct Answer: 3

Photosynthesis is a process in which

1. ATP is generated
2. NADH is reduced to NAD
3. Oxidative phosphorylation occurs
4. CO2 is reduced

✅ Correct Answer: 4

Rate of growth stops and plants die at a temperature of

1. 20-30Â°C
2. 10-20Â°C
3. 35-40Â°C
4. 5-10Â°C

✅ Correct Answer: 3

Effect of auxin diffusing from apical bud on lateral shoots is known as

1. promoting effect
2. compensatory effect
3. inhibitory effect
4. supporting effect

✅ Correct Answer: 3

Compensation point is the value of a factor where there is

1. Beginning of photosynthesis
2. Little photosynthesis
3. Photosynthesis equal to rate of respiration
4. Neither photosynthesis nor respiration

✅ Correct Answer: 3

All of the following are plant growth inhibitors except;

1. ABA
2. Dormin
3. Ethylene
4. IAA

✅ Correct Answer: 4

ATP is

1. Adenine triphosphate
2. Adenine tetraphosphate
3. Adenosine tetraphosphate
4. None of the above

✅ Correct Answer: 4

Direction of conduction of food through phloem is

1. From below upwards
2. From tip to bottom
3. Phloem never conducts food
4. From leaves to roots

✅ Correct Answer: 4

Bioassay for auxin is ..

1. ) Dwarf maize test
2. Avena curvature test
3. Cell division test
4. Green leaf test

✅ Correct Answer: 2

Photorespiration involves oxidation of

1. Chlorophyll a
2. PGA
3. RuBP
4. Both b and c

✅ Correct Answer: 3

Apical dominance is caused by ...

1. Abscisic acid in lateral bud
2. Cytokinin in leaf tip
3. Gibberellin in lateral buds
4. Auxin in shoot tip

✅ Correct Answer: 4

A chemical believed to be involved in flowering is ... .

1. Gibberellin
2. Kinetin
3. Florigen
4. IBA

✅ Correct Answer: 3

One of these is herbicide ...

1. IAA
2. NAA
3. GA3
4. 2,4-D

✅ Correct Answer: 4

C4 plants differ from C3 plants with respect to

1. Substrate which accepts carbon dioxide
2. First product
3. Number of ATP molecules consumed
4. All of the above

✅ Correct Answer: 4

Which does not HSK pathway

1. Jowar
2. Maize
3. Sugarcane
4. Sunflower

✅ Correct Answer: 4

Pigment system I performs independently

1. Non-cyclic photophosphorylation
2. Cyclic photophosphorylation
3. Oxidative phosphorylation
4. Photolysis

✅ Correct Answer: 2

Read the following four statements, A, B, C and D and select the right option having both correct statements. STATEMENTS: (A) Z scheme of light reaction takes place in presence of PS I only. (B) On

1. A and B are correct
2. B and C are correct
3. A and C are correct
4. B and D are correct

✅ Correct Answer: 4

Which one is not a C4 plant?

1. Maize
2. Sugarcane
3. Bryophyllum.
4. Sorghum.

✅ Correct Answer: 3

Leaf fall occurs when content of

1. Abscisic acid decreases
2. Auxin decreases
3. Auxin increases
4. Gibberellin decreases

✅ Correct Answer: 2

In C4 photosynthesis, both C4 and C3 cycles are involved. Identify the catalytic function of RUBISco in C4 cycle

1. Oxygenation of RUBP.
2. Carboxylation of PEP.
3. Carboxylation of RuBp.
4. No function

✅ Correct Answer: 4

Identify the following: (i) They have a special type of leaf anatomy. (ii) They tolerate a high range of temperature. (iii) They show responses to high light intensities. (iv) They lack photorespi

1. C2 plants
2. C3 plants
3. CAM plants
4. C4 plants

✅ Correct Answer: 4

How many of the following statements are true: (a) NAD mainly involved in catabolic pathway. (b) NADP mainly involved in anabolic pathway. (c) Non â€“ cyclic electron transport is a multidirectional

1. One
2. Two
3. Three
4. Four

✅ Correct Answer: 2

Bulliform cells in Grass leaves show

1. Growth movements
2. Tropic movements
3. Nastic movements
4. Turgor movements

✅ Correct Answer: 4

Opening of flower and drooping of bud are ...

1. Hyponasty
2. Epinasty
3. Curvature movement
4. Spontaneous movements

✅ Correct Answer: 2

Why are C4 plants able to photosynthesize with no apparent photorespiration?

1. They do not participate in the Calvin cycle.
2. They use PEP carboxylase to initially fix CO2 .
3. They are adapted to cold, wet climates.
4. They conserve water more efficiently.

✅ Correct Answer: 2

The name zeatin was coined by ...

1. Skoog
2. Miller
3. Letham
4. Melvin

✅ Correct Answer: 3

Which of the following sequences correctly represents the flow of electrons during photosynthesis

1. H2O &#8594; photosystem I &#8594; photosystem II
2. NADPH &#8594; chlorophyll &#8594; Calvin cycle
3. H2O &#8594; NADPH &#8594; Calvin cycle
4. NADPH &#8594; O 2 &#8594; CO2

✅ Correct Answer: 3

Ability of Venus Fly Trap to capture insects is due to ...

1. Specialised "muscle-like" cells
2. Chemical stimulation by prey
3. Rapid turgor pressure changes
4. Passive process requiring no special ability on the apart of the pant

✅ Correct Answer: 3

How many pigments are responsible for the colour of a plant leaf?

1. One
2. Two
3. Three
4. Four

✅ Correct Answer: 4

In a plant subjected to continuous red light phytochrome will show ...

1. Increased synthesis
2. Decreased level
3. Destruction
4. Destruction and synthesis remain in balance

✅ Correct Answer: 4

During photorespiration, the oxygen consuming reaction(s) occur in

1. Stroma of chloroplast and peroxisomes.
2. Grana of chloroplasts and peroxisomes.
3. Stroma of chloroplasts.
4. Stroma of chloroplasts and mitochondria

✅ Correct Answer: 1

Who first suggested presence of growth regulatory chemicals in plants?

1. Went
2. Sachs
3. Darwin
4. Paal

✅ Correct Answer: 1

&#945;-Ketoglutarate dehydrogenase brings about

1. Oxidation and decarboxylation
2. Reduction
3. Oxidation
4. Decarboxylation

✅ Correct Answer: 1

2,4-D causes ...

1. Delay in senescence
2. Bolting
3. Increase in branches
4. Increased growth of all parts

✅ Correct Answer: 4

Which one is product of aerobic respiration?

1. Pyruvic acid
2. Lactic acid
3. Ethyl alcohol
4. Malic acid

✅ Correct Answer: 4

Which one is used for defoliation of forest trees? ..

1. Phosphon D
2. Maleic hydrazide
3. AMO 1618
4. 2, 4-D

✅ Correct Answer: 4

As compared to anaerobic respiration, the energy gained during aerobic respiration is

1. 8 times
2. 14 times
3. 15times
4. 19 times

✅ Correct Answer: 4

The other name of glycolysis is

1. Carbon pathway
2. TCA pathways
3. HMS pathways
4. EMP pathways

✅ Correct Answer: 4

Statement a: Auxins promote apical dominance by suppressing activity of lateral buds Statement b: In moriculture, periodic pruning of shoot tips is done to makes Mulberry plants bushy

1. a and b correct with a being reason for b
2. a is correct, b is wrong
3. a is wrong, b is correct
4. Both a and b correct but a is not reason for b

✅ Correct Answer: 4

Oxidation of one molecule of glucose in aerobic respiration produces

1. 2 ATP
2. 8 ATP
3. 16 ATP
4. 38 ATP

✅ Correct Answer: 4

Which of the following stimulates growth or call enlargement? ..

1. Gibberellin
2. Auxin
3. Cytokinin
4. Ethylene

✅ Correct Answer: 2

In mitochondria, protons accumulate in

1. Inter membrane space
2. Inner membrane
3. Matrix
4. Outer membrane

✅ Correct Answer: 1

Treatment of seeds at low temperature under moist conditions for breaking their dormancy is ... .

1. Vernalisation
2. Chelation
3. Stratification
4. Scarification

✅ Correct Answer: 3

Oxidative phosphorylation refers to

1. Anaerobic production of ATP
2. Citric acid cycle production of ATP
3. Production of ATP by chemiosmosis
4. Alcoholic fermentation

✅ Correct Answer: 2

Biennials get changed into annuals by ...

1. Hormones
2. Photoperiodism
3. Grafting
4. Vernalisation

✅ Correct Answer: 4

How many molecules of NADH are produced when four molecules of phosphoglyceraldehyde are converted into four molecules of pyruvate

1. 2
2. 8
3. 6
4. 4

✅ Correct Answer: 4

Pigment involved in regulation/photomorphogenesis response is ...

1. Phytochrome
2. Cytochrome
3. Xanthophyll
4. Chlorophyll

✅ Correct Answer: 1

Cell respiration is carried out by

1. Ribosomes
2. Golgi bodies
3. Mitochondria
4. Chloroplasts

✅ Correct Answer: 3

Parthenocarpic fruit cannot be produced by application of ...

1. IAA
2. 2,4-D
3. ABA
4. IBA

✅ Correct Answer: 3

Flash of light in dark inhibits flowering in ..

1. SDP
2. LDP
3. LSDP
4. DNP

✅ Correct Answer: 1

When malic acid is respiratory substrate, the amount of CO2 released is

1. More than O2 consumed
2. Less than O2 released
3. Equal to O2 consumed
4. CO2 is not released

✅ Correct Answer: 1