NEET MCQs Plant Growth and Development – Sample

Rapid and dramatic increase in shoot length is called
a) Triple response growth b) Bolting
c) scarification d) Night break effect
Environment heterophylly is seen in
a) Cotton b) Coriander c) Larkspur d) Buttercup
Genetically dwarf plants can be induced to grow tall by using
a) Gibberellins b) Phycobillins c) Auxins d) Cytokinins
Increased growth per unit time is termed as
a) Nascent growth rate b) Growth rate c) Biomass d) All of these
Which plant hormone promotes seed dormancy, bud dormancy and causes stomatal closure?
a) IAA b) Abscisic acid c) GA d) cytokinin
I. Lag phase → Log phase → Stationary phase
II. Geometric and Arithmetic phase of growth
III. Growth shown by all living organism 𝑖𝑛 𝑣𝑖𝑣𝑜
IV. 𝐿𝑡=𝐿0+𝑟𝑡
Match the above characters with sigmoid curve, arithmetic growth, embryo development and choose the
correct option accordingly
Sigmoid curve Arithmetic Embryo
growth development
a) II I III, IV b) I, III IV II
c) I II, III IV d) III, IV I II
A plant have 13 hours critical day light under which condition it will flower
Duration of light Duration of dark
period period
a) 13 11 b) 11 13
c) 12 12 d) 10 14
The shedding of leaves, flowers or fruits due to change in the hormonal balance in plants, is referred as
a) Senescence b) Ascission c) Photoperiodism d) vernalization
The phytohormone that induces cell elongation is known to be produced by a fungus. The asexual stage of
this fungus is called
a) Rhizopus sexualis b) Fusarium moniliformae
c) Gibberella fujikuroi d) Fusarium oxysporum
Cytokinins are mostly
a) Glucosides b) Amino purines c) Acidic d) phenolic
Geotropic response is perceived by
a) Mature roots b) Elongation roots c) Root cap d) Root hairs
The natural plant hormone isolated from corn kernels and coconut milk is
a) Florigen b) 𝐺𝐴3 c) Free auxins d) Zeatin
In the expression, 𝑊1=𝑊0 𝑒𝑟𝑡 (geometrical growth), 𝑊1,𝑊0,𝑟,𝑡 represents
𝑊0 𝑊1 𝑟 𝑡
a) Initial size Final size Growth rate Time of growth
b) Final size Initial size Growth rate Time of growth

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c) Final size Initial size Growth rate Time of dividing
d) Initial size Final size Growth rate Time of dividing

Natural cytokinins are synthesized in tissue that are
a) Senescent b) Dividing rapidly c) Storing food material d) Differentiating
Which of the following processes is concerned with Cholodny-Went theory?
a) Photomorphogenesis b) Photoperiodism c) Phototropism d) photorespiration
Growth at cellular level is the increase in the amount of
a) Cell wall b) Cell membrane c) Protoplasm d) All of the above
Which one of the following is a natural growth inhibitor?
a) NAA b) ABA c) IAA d) GA
I. Antagonist to GA
II. Promoted bud dormancy
III. Promoted stomatal closure
IV. Promoted abscission layer
Identify the hormone/s which promote/s all these events in plants and choose the correct option
a) Cytokinin b) Auxin c) Abscisic acid d) C2H4
Thigmotropism is best seen in
a) Tendrils b) Leaf apex c) Root apex d) Stem apex
In coleoptile tissue, auxin is
a) Not transported because it is used where it is made
b) Transported by diffusion
c) Transported from the base to tip by osmosis
d) Produced by growing apices of stem, which migrate to the region of its action
Which of the following induces flowering in long day plants?
a) Gibberellins b) Cytokinin c) Auxins d) Ethylene
I. Lag phase
II. Stationary phase
III. Exponential phase
Arrange the above steps of geometrical growth (from beginning to last) in a correct sequence of their
occurrence and choose the correct option accordingly
a) I → II → III b) I → III → II c) III → II → I d) III → I → II
Fruits can be left on the tree longer, so as to increase the market period. This is due to the function of
a) Delay senescence by auxin b) Delay senescence by CH2−CH2
c) Delay senescence by cytokinin d) Delay senescence by GA
Name the process when dedifferentiated cells again loss the ability to divide and get mature?
a) Cell-enlargement b) Redifferentiation c) Dedifferentiation d) Differentiation
For cryopreservation, plant materials are frozen at
a) −196℃ b) −150℃ c) −80℃ d) −40℃
Maximum elongation takes place in
a) Conducting tissue b) Fibre
c) Both (a) and (b) d) Cell wall and membrane
One hormone helps in ripening of fruits, while the other stimulates closure of stomata. These are
respectively
a) Abscisic acid and auxin b) Ethylene and abscisic acid
c) Auxin and ethylene d) Ethylene and gibberellic acid
Micropropagation is done by
a) Auxins b) GA c) Cytokinin d) Both (a) and (b)
Auxanometer is used to mesure
a) The growth in length of a plant organ b) The growth in breadth of a plant organ
c) Population of the pests attacking a plant d) Both (a)and(b)

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The cut flowers and vegetables can be kept fresh for a long period by this plant hormone.
a) Gibberellins b) Cytokinins
c) Auxins d) Ethylene
Photoperiodism was first characterized in
a) Tobacco b) Potato c) Tomato d) Cotton
Hydroponics is a system of growing plants in
a) Soil less culture or solution culture b) Acidic soils
c) Soil less culture with alkaline pH d) Soil less culture with acidic pH
If a plant need 10 hours darkness than identify the condition under which it will flower
I. 14 hours day period
II. 10 hours dark period
III. 91
2
hours dark period
IV. 9 hours dark period
Choose the correct option
a) I and III b) II and III c) I and IV d) I and II
What helps in flowering?
a) Cytochrome b) ABA c) Phytochrome d) Ethylene
Which of them is not an extrinsic factor?
a) Light, O2 b) Temperature, CO2
c) Nutrient, water d) Growth regulator and genetic factor
The stress hormone that helps plant to respond drought is
a) Auxins b) Abscisic acid c) Cytokinin d) Ethylene
Auxins promote
a) Cell growth and enlargement b) Cambial activity
c) Apical dominance d) All of the above
The flowers of 𝑂𝑥𝑎𝑙𝑖𝑠 open during the day and close at night, such type of movement is
a) Photonasty b) Nyctinasty c) Phototactic d) Seismonastic
Developing embryo (𝑖𝑛 𝑣𝑖𝑡𝑟𝑜) shows
a) Geometric growth b) Arithmetic growth
c) Geometric and arithmetic growth d) None of the above
Respiratory climacteric is related with
a) ABA b) C2H4 c) Auxin d) GA
I. Increased vacuolation
II. Cell enlargement
III. New cell wall deposition
Which of the above are the characteristics of phase of elongation?
Choose the correct option accordingly
a) I and II b) II and III c) I and III d) I, II and III
Coiling of garden pea tendrils around any support is an example of
a) Thigmotaxis b) Thigmonasty c) Thigmotropism d) Thermotaxis
Internodal elongation just prior to flowering in beet, cabbage and in many plants with rosette habit is
called
a) Pruning b) Blotting c) Grafting d) Cutting
Member of auxin, which is widely used to kill the dicotyledonous weed is
a) IAA b) IBA c) NAA d) 2-4-D
Identify to which plant hormone, the given function belongs
I. Initiates flowering in pineapples
II. Induces flowering in mango
III. Root growth and root hair promotion

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I II III
a) C2H4 C2H4 C2H4 b) C2H4 IAA GA
c) C2H4 GA IAA d) GA IAA IBA

Growth period of plant is generally divided into
a) Four phases b) Three phases c) Two phases d) Five phases
Difference between kinetin and zeatin is
a) Kinetin is active zeatin, is non-active b) Zeatin is active kinetin, is non-active
c) Zeatin is synthetic, kinetin is natural d) Zeatin is natural, kinetin is synthetic
Auxanometer is used to detect
a) Respiration b) Transpiration c) Plant movement d) Growth
Auxin was isolated by
a) Charles Darwin b) Francis Darwin c) FW Went d) de Vries
The most common auxin is
a) GA b) ABA c) Kinetin d) IAA
Study the following statements
I. O2 helps in releasing metabolic energy, which is essential for growth
II. Nutrients are required by plants for the synthesis of protoplasm
III. Change in temperature could be the detrimental for the survival of an organism
IV. Light and gravity don’t affect the stages of growth
Choose the correct option
a) I, II, III and IV b) I, II and III c) I, III and IV d) I, II and IV
Which plant hormone is found in gaseous form?
a) Auxin b) Cytokinin c) Ethylene d) ABA
Measurement and comparison of total growth in geometrical growth of a plant per unit time is called
a) Absolute growth rate b) Qualitative growth rate
c) Relative growth rate d) Exponential growth rate
Auxin in plant means for
a) Cell elongation b) Fruit ripening
c) Cell division d) Inhibition of root growth
Grand place of growth is an another name of
a) Lag phase b) Stationary phase
c) Diminishing growth phase d) Exponential growth phase
Which of the following movements in plants is due to the increased concentration of auxin?
a) Movement of shoot towards the source of light b) Nyctinasty
c) Movement of sunflower towards sun d) All of the above
Primary growth of plants is contributed by
a) Root apical meristem b) Shoot apical meristem
c) Intercalary meristem d) All of these
Growth of the plant is open because of
a) Differentiation b) Dedifferentiation c) Redifferentiation d) All of the above
Senescence as an active developmental cellular process in the growth and functioning of a flowering plant,
is indicated in
a) Vessels and tracheid differentiation b) Leaf ascission
c) Annual plants d) Floral parts
Phytohormone commonly called stress hormone is
a) Auxin b) Abscisic acid c) Gibberellins d) cytokinins
Which one of the following is not a effect of gibberellin?
a) Increase grapes stalk b) Delay senescence of fruit
c) Induce dormancy d) Increase sugarcane stem
Study the following question

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I. Who was the first to confirm the release of volatile?
Substance from ripened organs of plants?
II. Who discovered kinetin from herring sperm?
III. Who discovered GA?
Which of the following option correctly answer the given questions?
a) I-Cousin, II-Miller and Skoog, III-Kurosawa b) I-Cousin, II-Kurosawa, III-Darwin
c) I-Cousin, II-Darwin, III-Kurosawa d) I-Kurosawa, II-Miller and Skoog, III-Cousins

Which of the following is essential for plant growth?
a) H2O b) O2 c) Nutrients d) All of these
Identify the pair of physiological effects of two phytohormones, which are synthesized from different
amino acids?
I. Formation of perennating buds in 𝐿𝑒𝑚𝑛𝑎.
II. Simultaneous flowering in pineapple.
III. Bolting in cabbage.
IV. Apical dominance in 𝑃𝑜𝑙𝑦𝑎𝑙𝑡ℎ𝑖𝑎.
a) II and IV b) I and IV c) II and III d) I and II
Choose the correct statement
I. Cytokinin – Delay of leaf senescene
II. Auxin – Apical dominance
III. Ethylene – Seed germination
IV. Gibberellins – Immature falling of leaves
a) I and II b) I and IV c) II and III d) II and IV
In geometrical growth, log phase is represented by
a) Rapid consumption of nutrient b) Rapid increment of cell number
c) Highest growth rate d) All of the above
The pigment involved in photomorphogenetic movement is
a) Cytochrome b) Phytochrome c) Chromatin d) vernalin
Growth in plants is measured by the increase in
I. fresh weight
II. dry weight
III. length, area and volume
IV. cell number
Choose the correct option
a) All except I and II b) All except III c) All except IV d) I, II, III and IV
To make stored food available for germination, with which hormone seed should be treated?
a) Gibberellins b) Auxin c) Abscisic acid d) Cytokinin
Which of the following induces flowering in long day plants?
a) Gibberellins b) Cytokinin c) Auxins d) Ethylene
The movement of hairs in 𝐷𝑟𝑜𝑠𝑒𝑟𝑎 is
a) Thermonastic b) Thigmonastic c) Seismonastic d) photonastic
Most widely used compound as a source of ethylene is
a) Nepthol b) Acetol c) Ethephon d) Ethepcon
The site of perception of light is
a) Root b) Shoot c) Leaves d) Meristem
On the basis of correlation, find the correct option from columns.
Column I Column II Column
III
I. Foolish
plant
(p)
Volatile
hormone
(i)
Induces
dormancy

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II. Induces
senescence
(q) GA (ii)Ripens
fruits
(r) Zeatin (iii)
Usually
sterile
plant

a) I-p-ii, II-r-i b) I-r-iii, II-q-iii c) I-q-iii, II-p-ii d) I-q-i, II-r-ii

Natural cytokinins are synthesised in which regions of plants?
a) Root apices b) Young fruit
c) Developing shoot buds d) All of the above
The rosette habit of cabbage can be changed by application of
a) IAA b) GA c) ABA d) Ethaphon
Which is used as weedicide?
a) 2,4-D b) IBA c) IAA d) ABA
The living differentiated cells, regain capacity of division under certain condition which called
a) Redifferentiation b) Dedifferentiation c) Differentiation d) Reverse division
Photoperiodism was first studied by
a) Garner and Allard b) Darwin c) FW Went d) Cousins
A phytohormone, which increases the production of starch hydrolyzing enzymes during the germination
of maize seeds, is employed for the following
a) Increasing the vase-life period of flowers b) Induction of seedless fruits in grapes
c) Acceleration of ripening of banana fruits d) Eradication of dicot weeds
Treatment of seed at low temperature under moist conditions to break its dormancy, is called
a) Scarification b) Vernalization c) Chelation d) Stratification
The Plant Growth Regulator (PGR), ethylene comes under the category of
a) Simple plant hormone b) Complex plant hormone
c) Plant growth inhibitor hormone d) Plant growth promoter hormone
Plants requiring low light intensity for optimum photosynthesis are called
a) Heliophytes b) Pteridophytes c) Sciophytes d) Bryophytes
𝑁𝑖𝑐𝑜𝑡𝑖𝑎𝑛𝑎 𝑠𝑦𝑙𝑣𝑒𝑠𝑡𝑟𝑖𝑠 flowers only during long days while N. tobacum flowers only during short days. If
raised in the laboratory under different photoperiods, they can be induced to flower at the same time and
can be cross fertilized to produce self-fertile offspring.
What is the best reason for considering N. sylvestris and N.tobacum to be separate species?
a) They are physiologically distinct b) They are morphologically distinct
c) They cannot interbreed in nature d) They are reproductively distinct
Large amount of ethylene is synthesised by
a) Developing roots and fruits b) Developing shoots and flowers
c) Senescence tissues and ripening fruits d) Young tissue and unripened fruits
In geometrical growth, lag phase is represented by
a) Initial rapid growth b) Latter rapid growth c) Initial slow growth d) Latter slow growth
Natural and synthetic-auxin (IAA, NAA, IBA, 2-4-D) have been used extensively in
a) Agriculture b) Horticulture c) Both (a) and (b) d) Sericulture
Water is required in plant growth for
a) Enzymatic reactions b) Cell enlargement c) Extension growth d) All of these
IAA is derived from or which of the following is involved in the synthesis of a plant IAA and vasoconstrides
cerotonin?
a) Tryptophan b) Tyrosine c) Phenylalanine d) None of these
During differentiation, the cells undergo few to major structural changes in their
a) Cell wall b) Protoplasm c) Both (a) and (b) d) Cytoplasm
Study the following statement
I. Cytokinins are formed primarily in roots

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II. Auxin and cytokinin are antagonistic in apical dominance
III. Kinetin (a modified DNA purine) was discovered from herring sperm
IV. Zeatin is auxin
V. Zeatin was firstly extracted from herring
Choose the incorrect one
a) I and II b) III c) II and V d) IV and V

SDP also called
a) Short night plant b) Long night plant
c) Intermediate night plant d) None of these
Arithmetic growth is linear because
a) One daughter cell remains meristematic and other differentiates and mature
b) Both daughter cell remains meristematic
c) Both daughter cells gets matured
d) All of the above
In S-shaped curve, the growth is highest in which phase?
a) Lag phase b) Steady phase c) Log phase d) All of these
Identify 𝐴,𝐵,𝐶 in the given graph and choose the correct option accordingly a) A-Log phase, B-Lag phase, C-Stationary phase
b) A-Lag phase, B-Log phase, C-Stationary phase
c) A-Lag phase, B-Stationary phase, B-Log phase
d) B-Log phase, B-Stationary phase, A-Lag phase
Pick out the correct statements.
V. Cytokinins especially help in delaying senescence.
VI. Auxins are involved in regulating apical dominance.
VII. Ethylene is especially useful in enhancing seed germination.
VIII. Gibberellins are responsible for immature falling of leaves.
a) I and III b) I and IV c) II and III d) I and II
Haptonastic movement is found in
a) 𝐷𝑟𝑜𝑠𝑒𝑟𝑎 b) 𝑂𝑥𝑎𝑙𝑖𝑠 c) 𝑀𝑖𝑚𝑜𝑠𝑎 d) 𝐶𝑢𝑐𝑢𝑟𝑏𝑖𝑡𝑎
Diagram 𝐴 and 𝐵 indicate the shape of leaves in larkspur and buttercup respectively, choose the correct
option a) The juvenile and adult leaf of larkspur differ in size due to genetic and plant growth regulator factors
b) Both leaf of buttercup differ in size due to genetic and intercellular factors
c) Both larkspur and buttercup leaf size variation is due to habitat plasticity
d) None of the above
Canary grass experiment for phototropism was firstly conducted by
a) Went b) Darwin c) Cousins d) Kurosawa
Which one is an example of redifferentiation?
a) Cork cambium b) Secondary cortex

NEET MCQs Plant Growth and Development – Free Pdf

NEET MCQs Plant Growth and Development – Sample

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