CBSE Class 11 Biology Plant Growth and Development MCQs Set C

Question: Which of these plant hormones helps plant to tolerate extremely dry climates?
a) ABA
b) Auxin
c) Cytokinin
d) GA
Answer: a

Question: Which combination of gases is suitable for fruit ripening?
a) 80% CH₄ and 20% CO₂
b) 80% CO₂ and 20% O₂
c) 80% C₂H₄ and 20% CO₂
d) 80% CO₂ and 20% CH₂
Answer: c

Question: Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.
a) Cytokinin
b) Gibberellin
c) Ethylene
d) Abscisic acid
Answer: c

Question: According to transpiration pull theory all the given factors contributes to ascent of sap except-
a) Cohesive and adhesive forces of water
b) Vertical water column in xylem fibres and xylem parenchyma.
c) Continuity of water column
d) Transpiration pull.
Answer: b

Question: The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by application of
a) NAA, 2, 4-D
b) Phenyl acetic acid
c) Cytokinin
d) IAA, IBA.
Answer: a

Question: Which one of the following growth regulators is known as ‘stress hormone’?
a) Abscisic acid
b) Ethylene
c) GA3
d) Indole acetic acid
Answer: a

Question: Phototropic curvature is the result of uneven distribution of
a) gibberellin
b) phytochrome
c) cytokinins
d) auxin.
Answer: d

Question: Typical growth curve in plants is
a) stair-steps shaped
b) parabolic
c) sigmoid
d) linear.
Answer: c

Question: Klinostat is employed in the study of
a) osmosis
b) growth movements
c) photosynthesis
d) respiration.
Answer: b

Question: ABA is involved in
a) shoot elongation
b) increased cell division
c) dormancy of seeds
d) root elongation.
Answer: c

Question: Which of the following is not an influence of auxins?
a) Apical dominance
b) Parthenocarpy
c) Phototropism
d) Fruit ripening
Answer: d

Question: Which of the following is not an inhibitory substance governing seed dormancy?
a) Gibberellic acid
b) Abscisic acid
c) Phenolic acid
d) Para-ascorbic acid
Answer: a

Question: Which of the following is not related to the non-cyclic process of light reaction?
a) The process involves both the photosystems which are interconnected by the ETS.
b) It results only in the synthesis of ATP, but not of NADPH + H+.
c) The membranes of the grana lamellae contain both PS I and PS II.
d) Photolysis of water is essential for it.
Answer: b

Question: Fruit and leaf drop at early stages can be prevented by the application of
a) ethylene
b) auxins
c) gibberellic acid
d) cytokinins.
Answer: b

Question: The microbe that produces root nodules on the roots of Alnus is :-
a) Nitrobacter
b) Rhizobium
c) Nitromonas
d) Frankia
Answer: d

Question: Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in
a) annual plants
b) floral parts
c) vessels and tracheid differentiation
d) leaf abscission.
Answer: c

Question: Auxin can be bioassayed by
a) potometer
b) lettuce hypocotyl elongation
c) Avena coleoptile curvature
d) hydroponics.
Answer: c

Question: In which of the following process, the cell loose their protoplasm to form tracheary element?
a) Dedifferentiation
b) Redifferentiation
c) Differentiation
d) Plasticity
Answer: c

Question: Which of the following is required for the chemiosmosis process?
a) Proton pump
b) Presence of a membrane
c) Presence of proton gradient
d) All of the options
Answer: d

Question: Growth is accompanied by
a) anabolic process and energy
b) catabolic process which occurs at the expense of energy.
c) metabolic processes which occur at the expense of energy
d) energy only
Answer: c

Question: Which of the following movement is not related to auxin level?
a) Bending of shoot towards light
b) Movement of root towards soil
c) Nyctinastic leaf movements
d) Movement of sunflower head tracking the sun
Answer: c

Question: Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone
a) auxin
b) cytokinin
c) ethylene
d) abscisic acid.
Answer: a

Question: The method that renders the seed coat permeable to water so that embryo expansion is not physically retarded is called
a) vernalization
b) stratification
c) denudation
d) scarification
Answer: d

Question: The Avena curvature is used for bioassay of
a) IAA
b) ethylene
c) ABA
d) GA3.
Answer: a

Question: The measure of the ability of the plant to produce new plant material is referred as —
a) efficiency index
b) absolute growth rate
c) arithmetic growth
d) linear growth
Answer: a

Question: Root development is promoted by
a) abscisic acid
b) auxin
c) gibberellin
d) ethylene.
Answer: d

Question: The hormones which was first isolated from human urine is.
a) indole-3-acetic acid
b) gibberellin
c) ethylene
d) kinetin
Answer: a

Question: It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?
a) Cytokinin and Abscisic acid
b) Auxin and Ethylene
c) Gibberellin and Cytokinin
d) Gibberellin and Abscisic acid
Answer: b

Question: A plant hormone used for inducing morphogenesis in plant tissue culture is
a) cytokinins
b) ethylene
c) abscisic acid
d) gibberellins.
Answer: a

Question: Which one of the following generally acts as an antagonist to gibberellins?
a) Zeatin
b) Ethylene
c) ABA
d) IAA
Answer: c

Question: Differentiation of shoot is controlled by
a) high auxin : cytokinin ratio
b) high cytokinin : auxin ratio
c) high gibberellin : auxin ration
d) high gibberellin : cytokinin ratio.
Answer: b

Question: Abscisic acid controls
a) cell division
b) leaf fall and dormancy
c) shoot elongation
d) cell elongation and wall formation.
Answer: b

Question: The ability of plant to follow different pathways and produce different structures in response to environment and phases of life is termed as —
a) elasticity
b) growth efficiency
c) plasticity
d) heterophylly
Answer: c

Question: Phototropic and geotropic movements are linked to
a) gibberellins
b) enzymes
c) auxin
d) cytokinins.
Answer: c

Question: In photosynthesis light reaction included-
a) Cyclic photophosphorylation
b) Non cyclic photophosphorylation
c) Both 1 and 2
d) Reduction of PGA
Answer: c

Question: What causes a green plant exposed to the light, on only one side, to bend towards the source of light as it grows?
a) Light stimulates plant cells on the lighted side to grow faster.
b) Auxin accumulates on the shaded side, stimulating greater cell elongation there.
c) Green plants need light to perform photosynthesis.
d) Green plants seek light because they are phototropic.
Answer: b

Question: In arithmetic growth rate, when length of the organ is plotted against time, the nature of graph curve will be —
a) linear
b) sigmoidal
c) parabolic
d) hyperbolic
Answer: a

Question: One of the commonly used plant growth hormone in tea plantations is
a) ethylene
b) abscisic acid
c) zeatin
d) indole-3-acetic acid.
Answer: d

Question: Parthenocarpic tomato fruits can be produced by
a) treating the plants with phenylmercuric acetate
b) removing androecium of flowers before pollen grains are released
c) treating the plants with low concentrations of gibberellic acid and auxins
d) raising the plants from vernalized seeds.
Answer: c

Question: One of the synthetic auxin is
a) IAA
b) GA
c) IBA
d) NAA.
Answer: c,d

Question: Which one of the following is chemically identical to ABA?
a) Indole-3-acetic acid
b) Kinetin
c) Dormin
d) 2, 4-D
Answer: c

Question: You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?
a) IAA and gibberellin
b) Auxin and cytokinin
c) Auxin and abscisic acid
d) Gibberellin and abscisic acid
Answer: b

Question: Which one of the following pairs, is not correctly matched?
a) Gibberellic acid – Leaf fall
b) Cytokinin – Cell division
c) IAA – Cell wall elongation
d) Abscissic acid – Stomatal closure
Answer: a

Question: Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly-cut coleoptile stumps. Of what significance is this experiment?
a) It made possible the isolation and exact identification of auxin.
b) It is the basis for quantitative determination of small amounts of growth-promoting substances.
c) It supports the hypothesis that IAA is auxin.
d) It demonstrated polar movement of auxins.
Answer: a

Question: How does pruning help in making the hedge dense?
a) It releases wound hormones.
b) It induces the differentiation of new shoots from the rootstock.
c) It frees axillary buds from apical dominance.
d) The apical shoot grows faster after pruning.
Answer: c

Question: Which one of the following acids is a derivative of carotenoids?
a) Indole-3-acetic acid
b) Gibberellic acid
c) Abscisic acid
d) Indole butyric acid
Answer: c

Question: Coconut milk factor is
a) an auxin
b) a gibberellin
c) abscisic acid
d) cytokinin.
Answer: a

Question: Germination takes place when the
a) previously dormant embryo is activated.
b) cotyledons emerge above the ground.
c) hypocotyl or epicotyl emerges above the ground.
d) vascular tissues begin to transport fluids.
Answer: b