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NEET • BIOLOGY • PLANT GROWTH AND DEVELOPMENT
Plant growth and development practice · Easy
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31
Easy
31 of 65
Remembering
+4 | -1
In which of the given plants plasticity is induced by different habitats?
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Correct option: A
Buttercup
Option A (Buttercup) is correct because buttercup exhibits plasticity induced by different habitats, showing different leaf forms in aquatic and terrestrial environments.
32
Easy
32 of 65
Remembering
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Which PGR was isolated from tips of coleoptiles of oat seeding by F.W. Went?
View answer and explanation
Correct option: A
Auxin
Option A (Auxin) is correct because F.W. Went isolated auxin from the tips of coleoptiles of oat seedlings.
33
Easy
33 of 65
Understanding
+4 | -1
The cells proximal (just next away from the tip) to the meristematic zone represents the phase of
View answer and explanation
Correct option: C
Elongation
Option C (Elongation) is correct because the cells just proximal to the meristematic zone are typically undergoing elongation, increasing in size before maturation.
34
Easy
34 of 65
Understanding
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Plant growth is unique because
View answer and explanation
Correct option: A
Plant retains the capacity for unlimited growth
Option A (Plant retains the capacity for unlimited growth) is correct because plants have meristematic tissues that allow for continuous growth throughout their life.
35
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Understanding
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Growth plotted against time gives a
View answer and explanation
Correct option: B
Sigmoid curve
Option B (Sigmoid curve) is correct because growth plotted against time typically results in a sigmoid or S-shaped curve.
36
Easy
36 of 65
Remembering
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Growth at cellular level is the increase in the amount of
View answer and explanation
Correct option: C
Protoplasm
Option C (Protoplasm) is correct because growth at the cellular level primarily involves an increase in the amount of protoplasm, which includes all the living components of the cell.
37
Easy
37 of 65
Remembering
+4 | -1
Which is used as weedicide?
View answer and explanation
Correct option: A
2,4-D
Option A is correct because 2,4-D (2,4-Dichlorophenoxyacetic acid) is a synthetic auxin widely used as a selective herbicide.
38
Easy
38 of 65
Remembering
+4 | -1
Which one of the following is a natural growth inhibitor?
View answer and explanation
Correct option: B
ABA
Option B (ABA) is correct because Abscisic Acid (ABA) is a well-known natural growth inhibitor in plants.
39
Easy
39 of 65
Remembering
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Respiratory climacteric is related with
View answer and explanation
Correct option: B
Option B () is correct because respiratory climacteric, a burst in respiration rate during fruit ripening, is associated with ethylene.
40
Easy
40 of 65
Remembering
+4 | -1
Specific areas in the higher plants which takes part in the formation of new cells are called
View answer and explanation
Correct option: C
Meristems
Option C (Meristems) is correct because meristems are regions in plants where active cell division occurs, leading to the formation of new cells and plant growth.
41
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41 of 65
Understanding
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Which among the following statements correctly defines the apical dominance?
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Correct option: A
The growing apical bud inhibits the growth of the lateral (axillary) buds.
Option A (The growing apical bud inhibits the growth of the lateral (axillary) buds) is correct because apical dominance is the phenomenon where the apical bud suppresses the growth of lateral buds.
42
Easy
42 of 65
Understanding
+4 | -1
Identify the mis-match of the following
View answer and explanation
Correct option: C
Auxins - Isolated from corn - Kernels and coconut milk
The correct answer is C (Auxins - Isolated from corn - Kernels and coconut milk) because while coconut milk contains cytokinins, auxins are not primarily isolated from corn kernels and coconut milk.
43
Easy
43 of 65
Remembering
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The branch of science dealing with senescence
is called
is called
View answer and explanation
Correct option: C
Gerontology
Option C (Gerontology) is correct because gerontology is the study of aging, including senescence in plants.
44
Easy
44 of 65
Remembering
+4 | -1
Which two points are known as the twin characteristics of growth?
(i) Increase in mass
(ii) Differentiation
(iii) Increase in number of individuals
(iv) Response to stimuli
(i) Increase in mass
(ii) Differentiation
(iii) Increase in number of individuals
(iv) Response to stimuli
View answer and explanation
Correct option: D
(i) and (iii)
Option D ((i) and (iii)) is correct because the twin characteristics of growth are an increase in mass and an increase in the number of individuals.
45
Easy
45 of 65
Understanding
+4 | -1
In most of the higher plants, the growing …A… bud inhibits the growth of …B… bud, a phenomenon called apical dominance. Removal of the shoot tips usually results in growth of …C… buds.
Complete the given statement with the correct combination of options given in the codes below
Complete the given statement with the correct combination of options given in the codes below
View answer and explanation
Correct option: C
A-apical, B-lateral, C-lateral
Option C (A-apical, B-lateral, C-lateral) is correct because apical dominance involves the apical bud inhibiting lateral bud growth, and removing the apical bud promotes lateral bud growth.
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46
Easy
46 of 65
Remembering
+4 | -1
Plant growth regulators are also described as
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because plant growth regulators are also known as plant growth substances, plant hormones, and phytohormones.
47
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47 of 65
Understanding
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Development includes (plants)
I. Differentiation
II. Redifferentiation
III. Dedifferentiation
Select the right combination from the given option
I. Differentiation
II. Redifferentiation
III. Dedifferentiation
Select the right combination from the given option
View answer and explanation
Correct option: D
I, II and III
Option D (I, II and III) is correct because development in plants includes all three processes: differentiation, redifferentiation, and dedifferentiation.
48
Easy
48 of 65
Understanding
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No correlation is observed between critical photoperiod and induction of flowering response in
View answer and explanation
Correct option: C
Day neutral plant
Option C (Day neutral plant) is correct because day-neutral plants flower independently of day length.
49
Easy
49 of 65
Understanding
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Gibberellic acid induces flowering
View answer and explanation
Correct option: B
In long day plants under short day conditions
The correct answer is B (In long day plants under short day conditions) because gibberellic acid can induce flowering in long-day plants even when they are grown under short-day conditions.
50
Easy
50 of 65
Remembering
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Growth period of plant is generally divided into
View answer and explanation
Correct option: B
Three phases
Option B (Three phases) is correct because the growth period of a plant is generally divided into three phases: formative, elongation, and maturation.
51
Easy
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Remembering
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The plant hormone which counteracts apical dominance is
View answer and explanation
Correct option: B
Cytokinin
Option B (Cytokinin) is correct because cytokinins promote cell division and counteract apical dominance by stimulating lateral bud growth, which is inhibited by auxin.
52
Easy
52 of 65
Remembering
+4 | -1
Most widely used compound as a source of ethylene is
View answer and explanation
Correct option: C
Ethephon
Option C (Ethephon) is correct because ethephon is widely used as a source of ethylene, as it decomposes to release ethylene gas.
53
Easy
53 of 65
Analyzing
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I. Kinetin is a degradative substance from DNA
II. ABA is present in all plants including lower plants
III. Low ratio of cytokinin to auxin favours root formation only
IV. ABA is synthesised catabolically through glycolysis pathway
Choose the correct combination of options
II. ABA is present in all plants including lower plants
III. Low ratio of cytokinin to auxin favours root formation only
IV. ABA is synthesised catabolically through glycolysis pathway
Choose the correct combination of options
View answer and explanation
Correct option: C
I and III
Option C (I and III) is correct because Kinetin is a modified form of adenine, not a degradative substance from DNA, and a low cytokinin to auxin ratio favors root formation.
54
Easy
54 of 65
Remembering
+4 | -1
Canary grass experiment for phototropism was firstly conducted by
View answer and explanation
Correct option: B
Darwin
Option B (Darwin) is correct because Charles Darwin and his son Francis Darwin conducted experiments on canary grass to study phototropism.
55
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Understanding
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Differentiation in plants is open because
View answer and explanation
Correct option: A
Cells/tissue arising out of meristem regain the capacity of division under certain conditions
Option A (Cells/tissue arising out of meristem regain the capacity of division under certain conditions) is correct because it describes the plant's ability to dedifferentiate and redifferentiate, making differentiation open.
56
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56 of 65
Remembering
+4 | -1
Which of the given plant hormone stimulates root formation on stem cutting?
View answer and explanation
Correct option: B
Auxin
The correct answer is B (Auxin) because auxins are known to promote root formation in stem cuttings, a process used in vegetative propagation.
57
Easy
57 of 65
Remembering
+4 | -1
Stimulus of vernalisation is perceived by
View answer and explanation
Correct option: D
Both (a) and (c)
The correct answer is D (Both (a) and (c)) because both shoot tips and embryo tips are capable of perceiving the stimulus of vernalisation.
58
Easy
58 of 65
Understanding
+4 | -1
Choose the incorrect pair.
View answer and explanation
Correct option: D
Abscisic acid – Flowering hormone
The correct answer is D (Abscisic acid – Flowering hormone) because abscisic acid is primarily involved in stress responses and dormancy, not flowering.
59
Easy
59 of 65
Remembering
+4 | -1
In S-shaped curve, the growth is highest in which phase?
View answer and explanation
Correct option: C
Log phase
Option C (Log phase) is correct because the log phase, also known as the exponential phase, is characterized by the highest rate of growth in the S-shaped curve.
60
Easy
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Understanding
+4 | -1
Assertion(A): Ethylene is a gaseous hormone.
Reason(R): Ethylene is formed in almost all plant parts.
Reason(R): Ethylene is formed in almost all plant parts.
View answer and explanation
Correct option: B
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
The correct answer is B (Both Assertion and Reason are true and Reason is not the correct explanation of Assertion) because while both statements are correct, the reason doesn't directly explain why ethylene is a gaseous hormone.
Revision notes and key takeaways
Review PLANT GROWTH AND DEVELOPMENT in your textbook or class notes, then use this set to check your understanding.
Showing 31-60 of 65 questions