Plant Growth and Development Practice Questions - DPP for NEET

 Page 1


Q.1 Match Column-I (Discovery) and Column-II
(Scientists) and select the correct option.
Column - I Column - II
(Discovery) (Name of scientists)
A. Foolish seedling I. Cousins
disease of rice
B. Crystallized the II. F.W. Went
Kinetin
C. Release of III. Skoog and Miller
ethylene gas
D. Bioassay of Auxin IV. E. Kurosawa
(a) A – III; B – IV; C – I; D – II
(b) A – IV; B – III; C – II; D – I
(c) A – IV; B – III; C – I; D – II
(d) A – IV; B – I; C – III; D – II
Q.2 Refer the functions of the growth hormones
given below.
I. Cell division II. Cell enlargement
III. Pattern formation IV . Tropic growth
V . Flowering VI. Fruiting
VII. Seed germination VIII. Response to wound
IX. Response to stresses of biotic and abiotic origin
Identify the functions of growth promoters
and growth inhibitors from the above.
Functions of growth 
promoters
Functions of 
growth inhibitor
(a) I, II, VII, IX III, IV, V, VI, VII
(b) VIII, IX I, II, III, IV, V, VI, 
VII
(c) I, II, III, IV, V, VI,VII VIII, IX
(d) I, II, III, IV, V, VI, VII, 
IX
VIII
Q.3 The graph given below shows a geometrical
growth rate.
      
Which of the following statement regarding
the above graph is incorrect?
(a) The initial growth is slow, thereafter exponential
phase and then stationary phase.
(b) A sigmoidal curve is a characteristic of living
organism growing in a natural environment.
(c) With limited nutrient supply, the growth rate
increases rapidly leading to an exponential phase.
(d) Geometrical growth is typical for all cells,
tissues and organs of a plant.
Q.4 The given figure shows the comparison of
growth rate of two leaves (A and B) over the
period of one day. Both the leaves A and B
have increased their area in a given time to
produce A’ and B’ leaves respectively. If AGR
= absolute growth rate and RGR = relative
growth rate, then select the correct option.
      A-Leaf    B-Leaf
AGR RGR AGR RGR
(a) 1% 1 2% 2
(b) 100% 5 10% 5
(c) 5 100% 5 10%
(d) 0.5 100% 1.5 100%
Q.5 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%
Q.6 Choose wrong statement for Abscisic acid (ABA) :
(i) It acts as a general plant growth inhibitor
and an inhibitor of plant metabolism.
(ii) ABA inhibits seed germination.
(iii) ABA stimulates the closure of stomata.
(iv) Increases the tolerance of plants to
various kinds of stresses. Therefore, it
is also called the stress hormone.
Plant Growth and Development
Page 2


Q.1 Match Column-I (Discovery) and Column-II
(Scientists) and select the correct option.
Column - I Column - II
(Discovery) (Name of scientists)
A. Foolish seedling I. Cousins
disease of rice
B. Crystallized the II. F.W. Went
Kinetin
C. Release of III. Skoog and Miller
ethylene gas
D. Bioassay of Auxin IV. E. Kurosawa
(a) A – III; B – IV; C – I; D – II
(b) A – IV; B – III; C – II; D – I
(c) A – IV; B – III; C – I; D – II
(d) A – IV; B – I; C – III; D – II
Q.2 Refer the functions of the growth hormones
given below.
I. Cell division II. Cell enlargement
III. Pattern formation IV . Tropic growth
V . Flowering VI. Fruiting
VII. Seed germination VIII. Response to wound
IX. Response to stresses of biotic and abiotic origin
Identify the functions of growth promoters
and growth inhibitors from the above.
Functions of growth 
promoters
Functions of 
growth inhibitor
(a) I, II, VII, IX III, IV, V, VI, VII
(b) VIII, IX I, II, III, IV, V, VI, 
VII
(c) I, II, III, IV, V, VI,VII VIII, IX
(d) I, II, III, IV, V, VI, VII, 
IX
VIII
Q.3 The graph given below shows a geometrical
growth rate.
      
Which of the following statement regarding
the above graph is incorrect?
(a) The initial growth is slow, thereafter exponential
phase and then stationary phase.
(b) A sigmoidal curve is a characteristic of living
organism growing in a natural environment.
(c) With limited nutrient supply, the growth rate
increases rapidly leading to an exponential phase.
(d) Geometrical growth is typical for all cells,
tissues and organs of a plant.
Q.4 The given figure shows the comparison of
growth rate of two leaves (A and B) over the
period of one day. Both the leaves A and B
have increased their area in a given time to
produce A’ and B’ leaves respectively. If AGR
= absolute growth rate and RGR = relative
growth rate, then select the correct option.
      A-Leaf    B-Leaf
AGR RGR AGR RGR
(a) 1% 1 2% 2
(b) 100% 5 10% 5
(c) 5 100% 5 10%
(d) 0.5 100% 1.5 100%
Q.5 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%
Q.6 Choose wrong statement for Abscisic acid (ABA) :
(i) It acts as a general plant growth inhibitor
and an inhibitor of plant metabolism.
(ii) ABA inhibits seed germination.
(iii) ABA stimulates the closure of stomata.
(iv) Increases the tolerance of plants to
various kinds of stresses. Therefore, it
is also called the stress hormone.
Plant Growth and Development
(v) ABA plays an important role in seed dormancy .
(vi) In most situations, ABA acts as an antagonist
to GAs.
(a) (i), (ii), (iii), (v) and (vi)
(b) (v) and (vi)
(c) (iii), (iv), (v), and (vi)
(d) None of these
Q.7 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
Q.8 Read the following statements and choose
wrong statement :
(i) The increased growth per unit time is
termed as growth rate.
(ii) The growth rate may be arithmetic or
geometrical.
(iii) In geometrical growth, following
mitotic cell division, only one daughter
cell continues to divide while the other
differentiates and matures.
(iv) In arithmetic growth, both the progeny
cells following mitotic cell division retain
the ability to divide and continue to do so.
(v) The simplest expression of arithmetic
growth is exemplified by a root elongating
at a constant rate.
(vi) Arithmetic growth is typical for all cells,
tissues and organs of a plant.
(a) (i), (ii) and (v) (b) (iii) and (iv)
(c) (iii), (iv) and (vi) (d) (ii) and (iv)
Q.9 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.
Q.10 Ethylene is used for
(a) retarding ripening of tomatoes.
(b) ripening of fruits.
(c) slowing down ripening of apples.
(d) both (b) and (c).
Q.11 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
Q.12 Which of the following hormone regulates
the transition from juvenile to adult phases
in conifers?
(a) Cytokinins (b) GA
(c) ABA (d) IAA
Q.13 Which form of gibberellic acid is used to
speed up the malting process in brewing
industry?
(a) GA
1
(b) GA
2
(c) GA
3
(d) None of these
Q.14 Statement I : Measurement and the comparison
of total growth per unit time is called the relative
growth rate.
Statement II : The growth of the given system
per unit time expressed on a common basis, e.g.,
per unit initial parameter is called the absolute
growth rate.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.15 Statement I : Development is a term that
includes all changes that an organism goes
through during its life cycle from germination of
the seed to senescence.
Statement II : Plants follow different pathways
in response to environment or phases of life to
form different kinds of structures, this ability is
called plasticity.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Page 3


Q.1 Match Column-I (Discovery) and Column-II
(Scientists) and select the correct option.
Column - I Column - II
(Discovery) (Name of scientists)
A. Foolish seedling I. Cousins
disease of rice
B. Crystallized the II. F.W. Went
Kinetin
C. Release of III. Skoog and Miller
ethylene gas
D. Bioassay of Auxin IV. E. Kurosawa
(a) A – III; B – IV; C – I; D – II
(b) A – IV; B – III; C – II; D – I
(c) A – IV; B – III; C – I; D – II
(d) A – IV; B – I; C – III; D – II
Q.2 Refer the functions of the growth hormones
given below.
I. Cell division II. Cell enlargement
III. Pattern formation IV . Tropic growth
V . Flowering VI. Fruiting
VII. Seed germination VIII. Response to wound
IX. Response to stresses of biotic and abiotic origin
Identify the functions of growth promoters
and growth inhibitors from the above.
Functions of growth 
promoters
Functions of 
growth inhibitor
(a) I, II, VII, IX III, IV, V, VI, VII
(b) VIII, IX I, II, III, IV, V, VI, 
VII
(c) I, II, III, IV, V, VI,VII VIII, IX
(d) I, II, III, IV, V, VI, VII, 
IX
VIII
Q.3 The graph given below shows a geometrical
growth rate.
      
Which of the following statement regarding
the above graph is incorrect?
(a) The initial growth is slow, thereafter exponential
phase and then stationary phase.
(b) A sigmoidal curve is a characteristic of living
organism growing in a natural environment.
(c) With limited nutrient supply, the growth rate
increases rapidly leading to an exponential phase.
(d) Geometrical growth is typical for all cells,
tissues and organs of a plant.
Q.4 The given figure shows the comparison of
growth rate of two leaves (A and B) over the
period of one day. Both the leaves A and B
have increased their area in a given time to
produce A’ and B’ leaves respectively. If AGR
= absolute growth rate and RGR = relative
growth rate, then select the correct option.
      A-Leaf    B-Leaf
AGR RGR AGR RGR
(a) 1% 1 2% 2
(b) 100% 5 10% 5
(c) 5 100% 5 10%
(d) 0.5 100% 1.5 100%
Q.5 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%
Q.6 Choose wrong statement for Abscisic acid (ABA) :
(i) It acts as a general plant growth inhibitor
and an inhibitor of plant metabolism.
(ii) ABA inhibits seed germination.
(iii) ABA stimulates the closure of stomata.
(iv) Increases the tolerance of plants to
various kinds of stresses. Therefore, it
is also called the stress hormone.
Plant Growth and Development
(v) ABA plays an important role in seed dormancy .
(vi) In most situations, ABA acts as an antagonist
to GAs.
(a) (i), (ii), (iii), (v) and (vi)
(b) (v) and (vi)
(c) (iii), (iv), (v), and (vi)
(d) None of these
Q.7 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
Q.8 Read the following statements and choose
wrong statement :
(i) The increased growth per unit time is
termed as growth rate.
(ii) The growth rate may be arithmetic or
geometrical.
(iii) In geometrical growth, following
mitotic cell division, only one daughter
cell continues to divide while the other
differentiates and matures.
(iv) In arithmetic growth, both the progeny
cells following mitotic cell division retain
the ability to divide and continue to do so.
(v) The simplest expression of arithmetic
growth is exemplified by a root elongating
at a constant rate.
(vi) Arithmetic growth is typical for all cells,
tissues and organs of a plant.
(a) (i), (ii) and (v) (b) (iii) and (iv)
(c) (iii), (iv) and (vi) (d) (ii) and (iv)
Q.9 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.
Q.10 Ethylene is used for
(a) retarding ripening of tomatoes.
(b) ripening of fruits.
(c) slowing down ripening of apples.
(d) both (b) and (c).
Q.11 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
Q.12 Which of the following hormone regulates
the transition from juvenile to adult phases
in conifers?
(a) Cytokinins (b) GA
(c) ABA (d) IAA
Q.13 Which form of gibberellic acid is used to
speed up the malting process in brewing
industry?
(a) GA
1
(b) GA
2
(c) GA
3
(d) None of these
Q.14 Statement I : Measurement and the comparison
of total growth per unit time is called the relative
growth rate.
Statement II : The growth of the given system
per unit time expressed on a common basis, e.g.,
per unit initial parameter is called the absolute
growth rate.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.15 Statement I : Development is a term that
includes all changes that an organism goes
through during its life cycle from germination of
the seed to senescence.
Statement II : Plants follow different pathways
in response to environment or phases of life to
form different kinds of structures, this ability is
called plasticity.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.16 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.
Q.17 Statement I : Heterophylly in cotton, coriander
and larkspur is an example of plasticity.
Statement II : Difference in shapes of leaves
produced in air and those produced in water in
buttercup represents the different shapes of
juvinile and mature plants.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.18 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
Q.19 Senescence in plants can be promoted by
applying.
(a) auxins (b) cytokinins
(c) GA (d) ethylene
Q.20 Statement I : Plant growth is unique because
plants retain the capacity for unlimited growth
throughout their life.
Statement II : This ability of the plants is due to
the presence of meristems at certain locations in
their body.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.21 Presence of which of the following compound
accelerates abscission of flower and fruits?
(a) Acetaldehyde (b) Ethephon
(c) Ascorbic acid (d) Zeatin
Q.22 Lead abscission, fruit fall, bud dormancy occurs
by which of the following phytohormone?
(a) Auxin
(b) Cytokinins
(c) Gibberellins
(d) Abscisic acid
Q.23 Which of the following hormone closes
stomata in response to water stress?
(a) IAA (b) ABA
(c) NAA (d) GA
3
Q.24 ABA is antagonistic to
(a) GA (b) cytokinin
(c) ethylene (d) auxin
Q.25 Read the following statements and choose
option which contain wrong statement for
growth.
(i) The period of growth is generally divided
into three phases, namely, meristematic,
elongation and maturation.
(ii) The constantly dividing cells, both at the
root apex and the shoot apex, represent
the meristematic phase of growth.
(iii) The cells proximal (just next, away from
the tip) to the zone represent the phase
of elongation.
(iv) Further away from the apex, i.e., more
proximal to the phase of elongation, lies
the portion of axis which is undergoing
the phase of maturation.
(v) The cells in elongation phase region are
rich in protoplasm, possess large
conspicuous nuclei and cell walls are
primary in nature.
(vi) Increased vacuolation, cell enlargement
and new cell wall deposition are the
characteristics of the cells in phase of
meristematic region.
(vii) The cells of zone of maturation, attain their
maximum size in terms of wall thickening
and protoplasmic modifications.
(a) (i), (ii) and (iv)
(b) (iii), (iv) and (v)
(c) (v) and (vi)
(d) (v), (vi) and (vii)
Page 4


Q.1 Match Column-I (Discovery) and Column-II
(Scientists) and select the correct option.
Column - I Column - II
(Discovery) (Name of scientists)
A. Foolish seedling I. Cousins
disease of rice
B. Crystallized the II. F.W. Went
Kinetin
C. Release of III. Skoog and Miller
ethylene gas
D. Bioassay of Auxin IV. E. Kurosawa
(a) A – III; B – IV; C – I; D – II
(b) A – IV; B – III; C – II; D – I
(c) A – IV; B – III; C – I; D – II
(d) A – IV; B – I; C – III; D – II
Q.2 Refer the functions of the growth hormones
given below.
I. Cell division II. Cell enlargement
III. Pattern formation IV . Tropic growth
V . Flowering VI. Fruiting
VII. Seed germination VIII. Response to wound
IX. Response to stresses of biotic and abiotic origin
Identify the functions of growth promoters
and growth inhibitors from the above.
Functions of growth 
promoters
Functions of 
growth inhibitor
(a) I, II, VII, IX III, IV, V, VI, VII
(b) VIII, IX I, II, III, IV, V, VI, 
VII
(c) I, II, III, IV, V, VI,VII VIII, IX
(d) I, II, III, IV, V, VI, VII, 
IX
VIII
Q.3 The graph given below shows a geometrical
growth rate.
      
Which of the following statement regarding
the above graph is incorrect?
(a) The initial growth is slow, thereafter exponential
phase and then stationary phase.
(b) A sigmoidal curve is a characteristic of living
organism growing in a natural environment.
(c) With limited nutrient supply, the growth rate
increases rapidly leading to an exponential phase.
(d) Geometrical growth is typical for all cells,
tissues and organs of a plant.
Q.4 The given figure shows the comparison of
growth rate of two leaves (A and B) over the
period of one day. Both the leaves A and B
have increased their area in a given time to
produce A’ and B’ leaves respectively. If AGR
= absolute growth rate and RGR = relative
growth rate, then select the correct option.
      A-Leaf    B-Leaf
AGR RGR AGR RGR
(a) 1% 1 2% 2
(b) 100% 5 10% 5
(c) 5 100% 5 10%
(d) 0.5 100% 1.5 100%
Q.5 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%
Q.6 Choose wrong statement for Abscisic acid (ABA) :
(i) It acts as a general plant growth inhibitor
and an inhibitor of plant metabolism.
(ii) ABA inhibits seed germination.
(iii) ABA stimulates the closure of stomata.
(iv) Increases the tolerance of plants to
various kinds of stresses. Therefore, it
is also called the stress hormone.
Plant Growth and Development
(v) ABA plays an important role in seed dormancy .
(vi) In most situations, ABA acts as an antagonist
to GAs.
(a) (i), (ii), (iii), (v) and (vi)
(b) (v) and (vi)
(c) (iii), (iv), (v), and (vi)
(d) None of these
Q.7 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
Q.8 Read the following statements and choose
wrong statement :
(i) The increased growth per unit time is
termed as growth rate.
(ii) The growth rate may be arithmetic or
geometrical.
(iii) In geometrical growth, following
mitotic cell division, only one daughter
cell continues to divide while the other
differentiates and matures.
(iv) In arithmetic growth, both the progeny
cells following mitotic cell division retain
the ability to divide and continue to do so.
(v) The simplest expression of arithmetic
growth is exemplified by a root elongating
at a constant rate.
(vi) Arithmetic growth is typical for all cells,
tissues and organs of a plant.
(a) (i), (ii) and (v) (b) (iii) and (iv)
(c) (iii), (iv) and (vi) (d) (ii) and (iv)
Q.9 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.
Q.10 Ethylene is used for
(a) retarding ripening of tomatoes.
(b) ripening of fruits.
(c) slowing down ripening of apples.
(d) both (b) and (c).
Q.11 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
Q.12 Which of the following hormone regulates
the transition from juvenile to adult phases
in conifers?
(a) Cytokinins (b) GA
(c) ABA (d) IAA
Q.13 Which form of gibberellic acid is used to
speed up the malting process in brewing
industry?
(a) GA
1
(b) GA
2
(c) GA
3
(d) None of these
Q.14 Statement I : Measurement and the comparison
of total growth per unit time is called the relative
growth rate.
Statement II : The growth of the given system
per unit time expressed on a common basis, e.g.,
per unit initial parameter is called the absolute
growth rate.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.15 Statement I : Development is a term that
includes all changes that an organism goes
through during its life cycle from germination of
the seed to senescence.
Statement II : Plants follow different pathways
in response to environment or phases of life to
form different kinds of structures, this ability is
called plasticity.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.16 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.
Q.17 Statement I : Heterophylly in cotton, coriander
and larkspur is an example of plasticity.
Statement II : Difference in shapes of leaves
produced in air and those produced in water in
buttercup represents the different shapes of
juvinile and mature plants.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.18 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
Q.19 Senescence in plants can be promoted by
applying.
(a) auxins (b) cytokinins
(c) GA (d) ethylene
Q.20 Statement I : Plant growth is unique because
plants retain the capacity for unlimited growth
throughout their life.
Statement II : This ability of the plants is due to
the presence of meristems at certain locations in
their body.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.21 Presence of which of the following compound
accelerates abscission of flower and fruits?
(a) Acetaldehyde (b) Ethephon
(c) Ascorbic acid (d) Zeatin
Q.22 Lead abscission, fruit fall, bud dormancy occurs
by which of the following phytohormone?
(a) Auxin
(b) Cytokinins
(c) Gibberellins
(d) Abscisic acid
Q.23 Which of the following hormone closes
stomata in response to water stress?
(a) IAA (b) ABA
(c) NAA (d) GA
3
Q.24 ABA is antagonistic to
(a) GA (b) cytokinin
(c) ethylene (d) auxin
Q.25 Read the following statements and choose
option which contain wrong statement for
growth.
(i) The period of growth is generally divided
into three phases, namely, meristematic,
elongation and maturation.
(ii) The constantly dividing cells, both at the
root apex and the shoot apex, represent
the meristematic phase of growth.
(iii) The cells proximal (just next, away from
the tip) to the zone represent the phase
of elongation.
(iv) Further away from the apex, i.e., more
proximal to the phase of elongation, lies
the portion of axis which is undergoing
the phase of maturation.
(v) The cells in elongation phase region are
rich in protoplasm, possess large
conspicuous nuclei and cell walls are
primary in nature.
(vi) Increased vacuolation, cell enlargement
and new cell wall deposition are the
characteristics of the cells in phase of
meristematic region.
(vii) The cells of zone of maturation, attain their
maximum size in terms of wall thickening
and protoplasmic modifications.
(a) (i), (ii) and (iv)
(b) (iii), (iv) and (v)
(c) (v) and (vi)
(d) (v), (vi) and (vii)
Q.26 Which statement is wrong regarding geometrical
growth ?
(i) On plotting the length of the organ
against time, a linear curve is obtained.
(ii) Mathematically, it is expressed as
L
t
 = L
0
 + rt.
(iii) Here, both the progeny cells following
mitotic cell division retain the ability to
divide and continue to do so.
(iv) If we plot the parameter of growth
against time, we get a typical sigmoid
or S-curve.
(v) A sigmoid curve is a characteristic of
living organism growing in a natural
environment.
(vi) It is typical for all cells, tissues and organs
of a plant.
(vii) The growth can be expressed as W
1
 = W
0
e
rt
.
(a) (i) and (ii) (b) (iii) and (v)
(c) (i) and (iv) (d) (i) and (v)
Q.27 Which of the following statements are true
regarding factors affecting growth ?
(i) Necessary conditions for growth- Water,
oxygen and nutrients.
(ii) The plant cells grow in size by cell
enlargement which in turn requires
water.
(iii) Turgidity of cells helps in extension
growth.
(iv) Plant growth and further development
is intimately linked to the water status
of the plant.
(v) Water also provides the medium for
enzymatic activities needed for growth.
(vi) Oxygen helps in releasing metabolic
energy essential for growth activities.
(vii) Nutrients (macro and micro essential
elements) are required by plants for the
synthesis of protoplasm and act as
source of energy.
(a) (i), (iii), (iv), (v) and (vi), (vii)
(b) (ii), (iv), (vi) and (vii)
(c) (ii), (iii), (iv), (v) and (vi)
(d) All of these
Q.28 Choose correct statements for plant growth
regulators :
(i) The discovery of each of the five major
groups of PGRs has been accidental.
(ii) Charles Darwin and his son Francis
Darwin observed that the coleoptiles of
canary grass shows phototropism.
(iii) Auxin was isolated by F.W. Went from
tips of coleoptiles of oat seedlings.
(iv) Skoog and Miller identified and
crystallised abscisic acid (ABA).
(v) Inhibitor-B, abscission II and dormin were
chemically identical and named kinetin.
(vi) Release of ethylene from ripened oranges
hastened the ripening of stored unripened
bananas.
(a) (i), (ii), (iii), (iv) and (vi)
(b) (i), (ii), (iii) and (vi)
(c) (ii), (iii), (iv), (v) and (vi)
(d) (ii), (iii), (iv) and (vi)
Q.29 Which of the following statement is not the
characteristic of growth of an organism?
(a) It is an irreversible permanent increase in size
of an organ / its part / an individual cell.
(b) It is accompanied by metabolic processes.
(c) It is quantitative and intrinsic.
(d) None of the above
Q.30 Which of the following statement is not correct
about the conditions for plant growth?
(a) Oxygen helps in releasing metabolic energy
essential for growth activities.
(b) Nutrients are required by plants for the synthesis
of protoplasm and act as source of energy.
(c) Light and gravity affect certain stages of growth.
(d) Water oxidizes glucose to provide energy.
Q.31 Which one of the following statement regarding
auxin is correct?
(a) IAA and IBA are natural but NAA, 2 4-D
and 2, 4, 5-T are synthetic auxins.
(b) IAA and NAA are natural but IBA, 2, 4, 5-T
and 2, 4-D are synthetic auxins.
(c) NAA and 2, 4, 5-T are natural but IAA, IBA
and 2, 4-D are synthetic auxins.
(d) IAA, NAA, IAB, 2, 4-D and 2, 4, 5-T are
synthetic auxins.
Page 5


Q.1 Match Column-I (Discovery) and Column-II
(Scientists) and select the correct option.
Column - I Column - II
(Discovery) (Name of scientists)
A. Foolish seedling I. Cousins
disease of rice
B. Crystallized the II. F.W. Went
Kinetin
C. Release of III. Skoog and Miller
ethylene gas
D. Bioassay of Auxin IV. E. Kurosawa
(a) A – III; B – IV; C – I; D – II
(b) A – IV; B – III; C – II; D – I
(c) A – IV; B – III; C – I; D – II
(d) A – IV; B – I; C – III; D – II
Q.2 Refer the functions of the growth hormones
given below.
I. Cell division II. Cell enlargement
III. Pattern formation IV . Tropic growth
V . Flowering VI. Fruiting
VII. Seed germination VIII. Response to wound
IX. Response to stresses of biotic and abiotic origin
Identify the functions of growth promoters
and growth inhibitors from the above.
Functions of growth 
promoters
Functions of 
growth inhibitor
(a) I, II, VII, IX III, IV, V, VI, VII
(b) VIII, IX I, II, III, IV, V, VI, 
VII
(c) I, II, III, IV, V, VI,VII VIII, IX
(d) I, II, III, IV, V, VI, VII, 
IX
VIII
Q.3 The graph given below shows a geometrical
growth rate.
      
Which of the following statement regarding
the above graph is incorrect?
(a) The initial growth is slow, thereafter exponential
phase and then stationary phase.
(b) A sigmoidal curve is a characteristic of living
organism growing in a natural environment.
(c) With limited nutrient supply, the growth rate
increases rapidly leading to an exponential phase.
(d) Geometrical growth is typical for all cells,
tissues and organs of a plant.
Q.4 The given figure shows the comparison of
growth rate of two leaves (A and B) over the
period of one day. Both the leaves A and B
have increased their area in a given time to
produce A’ and B’ leaves respectively. If AGR
= absolute growth rate and RGR = relative
growth rate, then select the correct option.
      A-Leaf    B-Leaf
AGR RGR AGR RGR
(a) 1% 1 2% 2
(b) 100% 5 10% 5
(c) 5 100% 5 10%
(d) 0.5 100% 1.5 100%
Q.5 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%
Q.6 Choose wrong statement for Abscisic acid (ABA) :
(i) It acts as a general plant growth inhibitor
and an inhibitor of plant metabolism.
(ii) ABA inhibits seed germination.
(iii) ABA stimulates the closure of stomata.
(iv) Increases the tolerance of plants to
various kinds of stresses. Therefore, it
is also called the stress hormone.
Plant Growth and Development
(v) ABA plays an important role in seed dormancy .
(vi) In most situations, ABA acts as an antagonist
to GAs.
(a) (i), (ii), (iii), (v) and (vi)
(b) (v) and (vi)
(c) (iii), (iv), (v), and (vi)
(d) None of these
Q.7 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
Q.8 Read the following statements and choose
wrong statement :
(i) The increased growth per unit time is
termed as growth rate.
(ii) The growth rate may be arithmetic or
geometrical.
(iii) In geometrical growth, following
mitotic cell division, only one daughter
cell continues to divide while the other
differentiates and matures.
(iv) In arithmetic growth, both the progeny
cells following mitotic cell division retain
the ability to divide and continue to do so.
(v) The simplest expression of arithmetic
growth is exemplified by a root elongating
at a constant rate.
(vi) Arithmetic growth is typical for all cells,
tissues and organs of a plant.
(a) (i), (ii) and (v) (b) (iii) and (iv)
(c) (iii), (iv) and (vi) (d) (ii) and (iv)
Q.9 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.
Q.10 Ethylene is used for
(a) retarding ripening of tomatoes.
(b) ripening of fruits.
(c) slowing down ripening of apples.
(d) both (b) and (c).
Q.11 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
Q.12 Which of the following hormone regulates
the transition from juvenile to adult phases
in conifers?
(a) Cytokinins (b) GA
(c) ABA (d) IAA
Q.13 Which form of gibberellic acid is used to
speed up the malting process in brewing
industry?
(a) GA
1
(b) GA
2
(c) GA
3
(d) None of these
Q.14 Statement I : Measurement and the comparison
of total growth per unit time is called the relative
growth rate.
Statement II : The growth of the given system
per unit time expressed on a common basis, e.g.,
per unit initial parameter is called the absolute
growth rate.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.15 Statement I : Development is a term that
includes all changes that an organism goes
through during its life cycle from germination of
the seed to senescence.
Statement II : Plants follow different pathways
in response to environment or phases of life to
form different kinds of structures, this ability is
called plasticity.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.16 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.
Q.17 Statement I : Heterophylly in cotton, coriander
and larkspur is an example of plasticity.
Statement II : Difference in shapes of leaves
produced in air and those produced in water in
buttercup represents the different shapes of
juvinile and mature plants.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.18 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
Q.19 Senescence in plants can be promoted by
applying.
(a) auxins (b) cytokinins
(c) GA (d) ethylene
Q.20 Statement I : Plant growth is unique because
plants retain the capacity for unlimited growth
throughout their life.
Statement II : This ability of the plants is due to
the presence of meristems at certain locations in
their body.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.21 Presence of which of the following compound
accelerates abscission of flower and fruits?
(a) Acetaldehyde (b) Ethephon
(c) Ascorbic acid (d) Zeatin
Q.22 Lead abscission, fruit fall, bud dormancy occurs
by which of the following phytohormone?
(a) Auxin
(b) Cytokinins
(c) Gibberellins
(d) Abscisic acid
Q.23 Which of the following hormone closes
stomata in response to water stress?
(a) IAA (b) ABA
(c) NAA (d) GA
3
Q.24 ABA is antagonistic to
(a) GA (b) cytokinin
(c) ethylene (d) auxin
Q.25 Read the following statements and choose
option which contain wrong statement for
growth.
(i) The period of growth is generally divided
into three phases, namely, meristematic,
elongation and maturation.
(ii) The constantly dividing cells, both at the
root apex and the shoot apex, represent
the meristematic phase of growth.
(iii) The cells proximal (just next, away from
the tip) to the zone represent the phase
of elongation.
(iv) Further away from the apex, i.e., more
proximal to the phase of elongation, lies
the portion of axis which is undergoing
the phase of maturation.
(v) The cells in elongation phase region are
rich in protoplasm, possess large
conspicuous nuclei and cell walls are
primary in nature.
(vi) Increased vacuolation, cell enlargement
and new cell wall deposition are the
characteristics of the cells in phase of
meristematic region.
(vii) The cells of zone of maturation, attain their
maximum size in terms of wall thickening
and protoplasmic modifications.
(a) (i), (ii) and (iv)
(b) (iii), (iv) and (v)
(c) (v) and (vi)
(d) (v), (vi) and (vii)
Q.26 Which statement is wrong regarding geometrical
growth ?
(i) On plotting the length of the organ
against time, a linear curve is obtained.
(ii) Mathematically, it is expressed as
L
t
 = L
0
 + rt.
(iii) Here, both the progeny cells following
mitotic cell division retain the ability to
divide and continue to do so.
(iv) If we plot the parameter of growth
against time, we get a typical sigmoid
or S-curve.
(v) A sigmoid curve is a characteristic of
living organism growing in a natural
environment.
(vi) It is typical for all cells, tissues and organs
of a plant.
(vii) The growth can be expressed as W
1
 = W
0
e
rt
.
(a) (i) and (ii) (b) (iii) and (v)
(c) (i) and (iv) (d) (i) and (v)
Q.27 Which of the following statements are true
regarding factors affecting growth ?
(i) Necessary conditions for growth- Water,
oxygen and nutrients.
(ii) The plant cells grow in size by cell
enlargement which in turn requires
water.
(iii) Turgidity of cells helps in extension
growth.
(iv) Plant growth and further development
is intimately linked to the water status
of the plant.
(v) Water also provides the medium for
enzymatic activities needed for growth.
(vi) Oxygen helps in releasing metabolic
energy essential for growth activities.
(vii) Nutrients (macro and micro essential
elements) are required by plants for the
synthesis of protoplasm and act as
source of energy.
(a) (i), (iii), (iv), (v) and (vi), (vii)
(b) (ii), (iv), (vi) and (vii)
(c) (ii), (iii), (iv), (v) and (vi)
(d) All of these
Q.28 Choose correct statements for plant growth
regulators :
(i) The discovery of each of the five major
groups of PGRs has been accidental.
(ii) Charles Darwin and his son Francis
Darwin observed that the coleoptiles of
canary grass shows phototropism.
(iii) Auxin was isolated by F.W. Went from
tips of coleoptiles of oat seedlings.
(iv) Skoog and Miller identified and
crystallised abscisic acid (ABA).
(v) Inhibitor-B, abscission II and dormin were
chemically identical and named kinetin.
(vi) Release of ethylene from ripened oranges
hastened the ripening of stored unripened
bananas.
(a) (i), (ii), (iii), (iv) and (vi)
(b) (i), (ii), (iii) and (vi)
(c) (ii), (iii), (iv), (v) and (vi)
(d) (ii), (iii), (iv) and (vi)
Q.29 Which of the following statement is not the
characteristic of growth of an organism?
(a) It is an irreversible permanent increase in size
of an organ / its part / an individual cell.
(b) It is accompanied by metabolic processes.
(c) It is quantitative and intrinsic.
(d) None of the above
Q.30 Which of the following statement is not correct
about the conditions for plant growth?
(a) Oxygen helps in releasing metabolic energy
essential for growth activities.
(b) Nutrients are required by plants for the synthesis
of protoplasm and act as source of energy.
(c) Light and gravity affect certain stages of growth.
(d) Water oxidizes glucose to provide energy.
Q.31 Which one of the following statement regarding
auxin is correct?
(a) IAA and IBA are natural but NAA, 2 4-D
and 2, 4, 5-T are synthetic auxins.
(b) IAA and NAA are natural but IBA, 2, 4, 5-T
and 2, 4-D are synthetic auxins.
(c) NAA and 2, 4, 5-T are natural but IAA, IBA
and 2, 4-D are synthetic auxins.
(d) IAA, NAA, IAB, 2, 4-D and 2, 4, 5-T are
synthetic auxins.
Q.32 Which of the following statement is correct
regarding ethylene?
(a) It delayes senescence.
(b) It decreases the respiration rate during fruit
ripening.
(c) It breaks seed and bud dormancy.
(d) It inhibits flowering in mango.
Q.33 Read the following statements (i-iv)
regarding “ethephon” and answer the
question which follows them.
(i) Ethephon is sprayed in aqueous solution
and is readily absorbed and transported
within the plant.
(ii) It hastens fruit ripening in tomatoes and
apples.
(iii) It can be used to induce fruit thinning in
cotton, cherry and walnut.
(iv) It is used to promote female sex expression
in cucumber and increase yield.
How many of the above statement(s) is/ are
correct?
(a) One (b) Two
(c) Three (d) All
Q.34 Which one of the following pairs is not
correctly matched?
(a) Abscisic acid — Stomatal closure
(b) Gibberellic acid — Leaf fall
(c) Cytokinin — Cell division
(d) IAA — Cell wall elongation
Q.35 Which one of the following pairs is
incorrectly matched?
(a) Adenine derivative - Kinetin
(b) Carotenoid derivative - ABA
(c) Terpenes - IAA
(d) Indole compounds - IBA
Q.36 Statement I : The constantly dividing cells, both
at the root apex and the shoot apex, represent
the meristematic phase of growth.
Statement II : The cells proximal to the meristematic
zone represent the phase of maturation.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.37 Statement I : A sigmoid curve is a characteristic
of living organism growing in a natural
environment.
Statement II : W
1
 = W
0
e
rt
 (W
1
 = final size,
W
0
 = initial size, r = growth rate, t = time of growth)
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.38 Statement I : The cells derived from root apical
and shoot apical meristems and cambium
differentiate and mature to perform specific
functions.
Statement II : This act leading to maturation is
termed as dedifferentiation.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.39 Which hormone is used to induce rooting
from cut end of the stem?
(a) Kinetin (b) Indole butyric acid
(c) GA
3
(d) Abscisic acid
Q.40 Statement I : Difference in shapes of leaves
produced juvinile and mature plant in buttercup.
Statement II : Buttercup represent the
heterophyllous development due to environment.
(a) Both statements are correct.
(b) Statement I is correct & II is incorrect.
(c) Statement I is incorrect & II is correct.
(d) Both statements are incorrect.
Q.41 Flowering in pineapple is promoted by
(a) GA
1
(b) C
2
H
4
(c) NAA (d) Kinetin
Q.42 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
Q.43 Statement I : ABA is also called the stress
hormone.
Statement II : ABA stimulates the opening of
stomata in the epidermis and decreases the
tolerance of plants to various kinds of stresses.