MCQ Questions Chapter 15 Plant Growth and Development Class 11 Biology

Please refer to MCQ Questions Chapter 15 Plant Growth and Development Class 11 Biology with answers provided below. These multiple-choice questions have been developed based on the latest NCERT book for class 11 Biology issued for the current academic year. We have provided MCQ Questions for Class 11 Biology for all chapters on our website. Students should learn the objective based questions for Chapter 15 Plant Growth and Development in Class 11 Biology provided below to get more marks in exams.

Chapter 15 Plant Growth and Development MCQ Questions

Please refer to the following Chapter 15 Plant Growth and Development MCQ Questions Class 11 Biology with solutions for all important topics in the chapter.

MCQ Questions Answers for Chapter 15 Plant Growth and Development Class 11 Biology

Question- In C₄ plants-
(a) Grana is present in mesophyll cells and absent in bundle sheath cells.
(b) Grana is absent in mesophyll cells and present in bundle sheath cells.
(c) Grana are present in both mesophyll cells and bundle sheath cells.
(d) Grana are absent in both mesophyll cells and bundle sheath cells.

Question- Diffusion pressure of the pure solvent is-
(a) Always more than its solution
(b) Sometimes more than its solution
(c) Less than its solution
(d) Equal to its solution

Question- Match the phytohormones given in column I with their function given in column II. Choose the answer with the correct combination :-

Column-I Phytohormones	Column-II Function
A. Auxins	p. Elongation of genetic dwarf plants
B. Gibberellins	q. Fruit ripening
C. Cytokinins	r. Formation of the abscission layer
D. Ethylene	s. Root initiation on stem cutting
	t. Richmond Lang effect

Options :-
(a) A-r, B-s, C- p, D-t
(b) A-p B-r, C- q, D- s
(c) A-s, B-t, C- r, D- q
(d) A-s, B-p, C- t, D- q

Question- Select the statement that is not correct form the following.
(a) Plants which utilize RuBP as primary acceptor in CO₂ fixations are called C₃ plants.
(b) Plants which utilize PEP as primary acceptor in CO₂ fixations are called C₂ plants.
(c) CAM plants lack structural compartmentalization of leaf as found in C₄ plants.
(d) C₄ photosynthetic pathway is more efficient than the C₃ pathway.

Question- Select the incorrect statement from the following :-
(a) During oxidation within a cell all the energy contained in respiratory substrate is released free into the cell.
(b) Energy is released in a series of slow step wise reaction controlled by enzymes.
(c) Energy is trapped as chemical energy in the form of ATP.
(d) Energy released by oxidation, in respiration is not used directly.

Question- Match the sites in column – I with Column – II and choose the correct combination:-

Column-I	Column-II
A. Grana of chloroplast	i. Light reaction
B. Mitochondrial matrix	ii. Dark reaction
C. Cytoplasm of cell	iii. Kreb’s cycle
D. Stroma of chloroplast	iv. EMP pathway

Options :
(a) A-ii, B-iii, C-iv, D-i
(b) A-i, B-iv, C- iii, D- ii
(c) A-iv, B-iii, C-i, D-ii
(d) A-i, B-iii, C- iv, D- ii

Question- Moll’s half leaf experiment proves that-
(a) Light is essential for photosynthesis
(b) CO2 is essential for photosynthesis
(c) O2 is released during photosynthesis
(d) Chlorophyll is essential for photosynthesis

Question- In PS-I the reaction center Chl- a has absorption maxima at——–, where as in PS-II Chl- a has absorption maxima at——–.
(a) 700 nm, 680 nm
(b) 680 nm, 700 nm
(c) 400 nm, 500 nm
(d) 700 nm, 800 nm

Question- The hormone responsible for nutrient mobilization which helps in the delay of leaf senescence is-
(a) Auxin 
(b) Gibbrellin
(c) Cytokinin 
(d) Ethylene

Question- Select the incorrect pairing.
(a) C₃ plant – Example maize
(b) C₄ plant – Structure: Kranz anatomy
(c) Calvin cycle – 1st stable product PGA
(d)Hatch and Slack cycle – 1st stable product OAA

Question- Which of the following statements is incorrect about photorespiration?
(a) In C₃ plants, photorespiration does not occur.
(b) In C₃ plants, some O₂ does not bind to RuBP, hence CO₂ fixation is decreased
(c) In the photo respiratory pathway there is neither synthesis of sugars nor of ATP.
(d) The biological function of photorespiration is not known yet.

Question- In tissue culture callus can be induced to form shoot or root by altering the ratio of-
(a) Auxin to cytokinin
(b) Cytokinin to ethylene
(c) Auxin to gibberellin
(d) Gibberellin to cytokinin

Question- Which of the following conclusions be drawn from the girdling experiment?
(a) Transport of food bidirectional.
(b) Phloem is the tissue responsible for translocation of food.
(c) Phloem is the tissue responsible for translocation of water.
(d) Xylem is the tissue responsible for translocation of food.

Question- Study the following statements regarding the chemiosmotic hypothesis in mitochondria and select the correct ones-
I. F1 headpiece contains the site for the synthesis of ATP from ADP + Pi.
II. F0 part form the channel through which protons crosses the inner membrane.
III. For ATP production H+ pass through F0 from the intermembrane space to the matrix down the electrochemical proton gradient.
(a) I and II only 
(b) II and III only
(c) I and III only 
(d) I, II, and III

Question- Select the correct sequence of formation of given intermediates of Krebs’ cycle-
(a) Succinate – Malate – Fumarate – OAA
(b) Fumarate –Succinate – Malate – OAA
(c) Succinate – Fumarate – Malate – OAA
(d) Malate – Fumarate – Succinate – OAA

Question- A single turn of the citric acid cycle yields –
(a) 2 FADH₂ , 2 NADH₂, 2 GTP
(b) 1 FADH₂ , 2 NADH₂, 1 GTP
(c) 1 FADH₂ , 3 NADH₂, 1 GTP
(d) 1 FADH₂ , 4 NADH₂, 1 GTP

Question- Identify the correct sequence of flow of electrons in the light reaction :-
(a) PS-I, Plasotquinone, Cytochromes, PS-II, Ferredoxin
(b) PS-I, Ferredoxin, PS-II
(c) PS-I, Plasotquinone, Cytochromes
(d) PS-II, Plasotquinone, Cytochromes, PS-I, Ferredoxin

Question- Which of the following points is shown by cell at the root or shoot apex ?
(a) Rich in protoplasm, possesses large conspicuous triploid nucleus.
(b) Cell wall is cellulosic, primary in nature and with abundant plasmodesmata.
(c) Rich in protoplasm with large conspicuous nucleus.
(d) Both (b) and (c).

Question- The plant hormone controlling fruit ripening is
(a) IAA
(b) GA 
(c) ABA
(d) Ethylene

Question- Maximal size in terms of wall thickening and protoplasmic modification are achieved by
(a) cells of divisional phase.
(b) cells of maturation phase.
(c) cells of elongation phase.
(d) cells of meristematic tissue.

Question- Which of the following hormone regulates the transition from juvenile to adult phases in confers?
(a) Cytokinins
(b) GA0
(c) ABA
(d) IAA

Question- Absolute growth rate is defined as the
(a) synthesis of new intercellular and extracellular materials.
(b) measurement & the comparison of total growth per unit time
(c) growth of the given system per unit time.
(d) increased growth per unit time.

Question- A primary root grows from 5 cm – 19 cm in a week.Calculate the relative growth rate over the period.
(a) 20%
(b) 40%
(c) 60%
(d) 80%

Question- De-differentiation is
(a) regaining the lost capacity of division by living cells.
(b) the ability of plant to produce different structures in response to environment.
(c) the intrinsic factor affecting plant growth.
(d) none of the above.

Question-A plant cell has potential to develop into a full plant. This is called
(a) totipotency
(b) gene cloning
(c) tissue culture
(d) regeneration

Question- A phytohormone is
(a) an ion that alters turgor pressure.
(b) small molecules of diverse chemical composition.
(c) a pigment responds to environmental changes.
(d) a secondary metabolic compound.

Question- Gibberellins can promote seed germination because of their influence on 
(a) Rate of cell division
(b) Production of hydrolyzing enzymes
(c) Synthesis of abscisic acid
(d) Absorption of water through hard seed coat.

Question- Ethylene is used for
(a) retarding ripening of tomatoes.
(b) ripening of fruits.
(c) slowing down ripening of apples.
(d) both (b) and (c).

Question- Which one of the following phytohormones is produced under water deficient condition and plays an important role in the tolerance response of plants to drought?
(a) Abscisic acid
(b) Cytokinin
(c) Ethylene
(d) Gibberellin

Question- Bud dormancy can be induced by 
(a) IAA
(b) GA
(c) ABA
(d) ethylene

Question- Which of the following hormone induces cell division ? 
(a) Auxin
(b) Gibberellin
(c) Cytokinin
(d) Trypsin

Question- Flowering in pineapple is promoted by
(a) GA₁
(b) C₂H₄
(c) NAA
(d) Kinetin

Question- Ethylene is not directly applied in the field as a gas due to its high diffusion rate. Which compound is used to overcome this limitation?
(a) Ethephon
(b) Agent orange
(c) Benzaldehyde
(d) 2, 4, 5-T

Question- A sigmoidal curve is obtained in geometrical growth because
(a) it has lag, log and then stationary phase.
(b) one daughter cell remains meristematic while the other daughter cell differentiates and matures.
(c) of the effect of environment on mitosis.
(d) none of the above

Question- Removal of apical (terminal) bud of a flowering plant
(or pruning of a flowering plant) leads to
(a) formation of new apical buds.
(b) formation of adventitious roots on the cut side.
(c) early flowering (or stopping of floral growth).
(d) promotion of lateral branches.

Question- Experiments done by Charles Darwin and his son on plant phototropism showed that
(a) auxin is produced in the tip of the coleoptile.
(b) the tip of the coleoptile is the light receptor of the plant.
(c) within coleoptiles, auxin moves laterally away from the source of the light.
(d) more cell elongation takes place on the shaded side of the plant.

Question- The chemicals from an unlabelled bottle of plant hormone when applied to a plant, a curvature induced by light is found in the stem. The chemical is most probably a
(a) auxin
(b) gibberellin
(c) kinetin
(d) ABA

Question- What type of plants will flower when short photoperiods are followed by long photoperiods?
(a) Long-short day plants
(b) Short-long day plants
(c) Intermediate plants
(d) None of these

Question- The fruits can be left on the tree longer so as to extend the market period. This is due to which function of GA ?
(a) Bolting
(b) Delays senescence
(c) Internodal elongation
(d) Parthenocarpy

Question- Which of the following hormones causes fruits like apple to elongate and improve its shape?
(a) GA
(b) ABA
(c) NAA
(d) 2, 4D

Question- Skoog and Miller stimulated cell division in tobacco plant with degraded DNA. The active ingredient in stimulants, which resembles cytokinins, was modified
(a) adenine
(b) auxin
(c) terpenes
(d) carotenoids

Question- Plant hormone which is translocated to other parts for growth of the plant is
(a) indole-3-acetic acid
(b) gibberellins
(c) cytokinins
(d) none of these

Question- Farmers in a particular region were concerned that premature yellowing of leaves of a pulse crop might cause a decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?
(a) Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5-trichlorophenoxy acetic acid.
(b) Frequent irrigation of the crop.
(c) Treatment of the plants with cytokinins along with small doses of nitrogenous fertilizer.
(d) Application of iron and magnesium to promote synthesis of chlorophyll.

Question- Arithmetic growth is expressed as
(a) Lt = L0 + rt
(b) L0 = L0 + rt
(c) W1 = W0 ert
(d) W0 = W1 ert

Question- Which one of the following hormone is used to eradicate dicotyledonous weeds, but does not have its effect on mature monocotyledonous plants?
(a) 2, 4-D
(b) IAA
(c) NAA
(d) IBA

Question- Abscisic acid is a
(a) gaseous hormone
(b) stress hormone
(c) volatile hormone
(d) liquid-gas mixture

Question- In plant, auxin synthesis occurs in 
(a) cortex
(b) xylem
(c) phloem
(d) root and shoot tips

Question- A long day plant flowers only if exposed to a light period
(a) more than its critical day length.
(b) less than its critical day length.
(c) equal to its critical day length.
(d) slightly less than its critical day length.

Question- Which of the following induces dormancy ?
(a) Auxin
(b) Cytokinin 
(c) Both (a) and (b)
(d) Abscisic acid

Question- One set (I) of a plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set (II) night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant (Set II)?
(a) Long day
(b) Darkness neutral
(c) Day neutral
(d) Short day

Question- Induction of cell division and delay in senescence is done by
(a) Cytokinins
(b) Auxins
(c) GA
(d) CoA

Question- Which one of the following is not a mechanical method for breaking seed dormancy?
(a) Abrasions with knives
(b) Abrasions with sandpaper
(c) Vigorous shaking into the flask
(d) By the action of microbes

Question- Climacteric in the plants means
(a) increase in respiration rate before the ripening phase.
(b) decrease in respiration rate before the ripening phase.
(c) increase in respiration rate after the ripening phase.
(d) decrease in respiration rate after the ripening phase.

Question- Which of the following acids is a derivative of terpenes?
(a) Gibberellic acid
(b) Naphthalene acetic acid
(c) Abscissic acid
(d) ‘a’ and ‘c’

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

Question- Identify the correct and incorrect statements from the following.
(i) 17,500 new cells are produced per hour by a single maize root apical meristem.
(ii) With the help of length, growth of pollen tube is measured.
(iii) The growth of the leaf is measured in term of volume.
(iv) Cells in a watermelon may increase in size by upto 3,50,000 times.
(a) (i), (ii), (iii) are correct and (iv) is incorrect.
(b) (i), (ii), (iv) are correct and (iii) is incorrect.
(c) (ii), (iii) are correct and (i), (iv) are incorrect.
(d) (i), (iv) are correct and (ii), (iii) are incorrect

Question- Which of the following is gaseous hormone ?
(a) Auxin
(b) Ethylene 
(c) Cytokinin
(d) GA

Question- Which is a weedicide ?
(a) IAA
(b) 2,4-D
(c) IBA
(d) NAA

Question- Which of the following represents the correct sequence of the development process in a plant cell?
(a) Cell division → Elongation → Senescence → Maturation
(b) Meristematic cell ® Maturation elongation → Death
(c) Cell division → Elongation → Maturation → Plasmatic growth
(d) Cell division → Differentiation → Maturation → Senescence

Question- Induction of cell division and delay in senescence is done by 
(a) cytokinins
(b) auxins
(c) GA
(d) CoA

Question- Which one of the following is incorrectly matched?
(a) IAA – Indole compound
(b) GA – Terpenes
(c) ABA – Carotenoid derivatives
(d) C₂H₄ – Adenine derivatives

Question- Curling of tendrils is due to 
(a) thigmotropism
(b) phototropism
(c) chemotropism
(d) nyctinasty

Question- Which one of the following promotes the abscission of older mature leaves and fruits?
(a) Indole compounds
(b) adenine derivatives
(c) derivatives of carotenoids
(d) gaseous hormones

Question-The exponential growth can be expressed as W1 = W0ert. What is ‘r’ in the expression ?
(a) Relative growth rate and depends on final size.
(b) Absolute growth rate & depends on initial size.
(c) Relative growth and also referred to as efficiency index.
(d) None of the above

Question- Avena curvature test is a bioassay for examining the activity of 
(a) auxins
(b) gibberellins
(c) cytokinins
(d) ethylene

Question- Which hormone is used to induce rooting from cut end of the stem?
(a) Kinetin
(b) Indole butyric acid
(c) GA₃
(d) Abscisic acid

Question- Which of the following effects is brought about by gibberellins but not by auxins?
(a) Inhibition of leaf abscission.
(b) Stimulation of cambial activity.
(c) Stimulation of fruit development.
(d) Breaking of dormancy in leaf buds.

Question- Which form of gibberellic acid is used to speed up the malting process in brewing industry?
(a) GA₁
(b) GA₂
(c) GA₃
(d) None of these

These questions consist
of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following five responses.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

Question- Assertion : Dark period plays more important part in flowering than light period.
Reason : Flowering occurs in short-day plant if the dark period is interrupted by light break. 

Question- Assertion : Photomodulation of flowering is a phytochrome regulated process.
Reason : Active form of phytochrome (PFR) directly induces floral induction in shoot buds. 

Question- Assertion (A) : Vernalization is acceleration of subsequent flowering by low temperature treatment.
Reason (R) : Site of vernalization is apical meristem.   

Question- Assertion : Auxins help to prevent fruit and leaf drop at early stages.
Reason : Auxins promote the abscission of older mature leaves and fruits.   

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