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NEET • BIOLOGY • PLANT GROWTH AND DEVELOPMENT
Plant growth and development practice · Easy
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1
Easy
1 of 65
Understanding
+4 | -1
Which of the following phytohormones may involve in growth inhibiting as well as growth promoting activities?
View answer and explanation
Correct option: D
Ethylene
Option D (Ethylene) is correct because ethylene can act as both a growth inhibitor (e.g., inhibiting stem elongation) and a growth promoter (e.g., promoting fruit ripening and root growth).
2
Easy
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Understanding
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Assertion(A): Plant growth is unique.
Reason(R): Plants exhibit unlimited growth through out their life.
Reason(R): Plants exhibit unlimited growth through out their life.
View answer and explanation
Correct option: A
Both Assertion and Reason are true and Reason is the correct explanation of Assertion
Option A (Both Assertion and Reason are true and Reason is the correct explanation of Assertion) is correct because plants exhibit unlimited growth throughout their life due to the presence of meristematic tissues.
3
Easy
3 of 65
Understanding
+4 | -1
Which hormone (PGR) encounters the apical dominance induced by auxin?
View answer and explanation
Correct option: B
Cytokinin
Option B (Cytokinin) is correct because cytokinin is known to counteract apical dominance induced by auxin.
4
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4 of 65
Understanding
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Assertion: Photomodulation of flowering is a phytochrome regulated process
Reason: Active form of phytochrome directly induces floral induction in shoot bud
Reason: Active form of phytochrome directly induces floral induction in shoot bud
View answer and explanation
Correct option: C
If assertion is true but Reason is false
Option C (If assertion is true but Reason is false) is correct because photomodulation of flowering is indeed a phytochrome-regulated process, but the active form of phytochrome does not directly induce floral induction in the shoot bud.
5
Easy
5 of 65
Remembering
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The deteriorative processes in plants that naturally terminate their functional life, are collectively called
View answer and explanation
Correct option: D
Senescence
Option D (Senescence) is correct because senescence is the deteriorative process in plants that naturally terminates their functional life.
6
Easy
6 of 65
Remembering
+4 | -1
Which of the following hormone promotes bolting ?
View answer and explanation
Correct option: B
Gibberellins
Option B (Gibberellins) is correct because gibberellins are known to promote bolting, which is the internode elongation and flowering in rosette plants.
7
Easy
7 of 65
Understanding
+4 | -1
The final structure at maturity of a cell/tissue is determined by
View answer and explanation
Correct option: C
Location of cell within tissue
Option C (Location of cell within tissue) is correct because the final structure at maturity is determined by the location of the cell within the tissue.
8
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8 of 65
Understanding
+4 | -1
The hormone popularised as Anti GA hormone can be used as
View answer and explanation
Correct option: D
Antitranspirant
The correct answer is D (Antitranspirant) because abscisic acid (ABA), often referred to as the \"Anti-GA\" hormone, promotes stomatal closure, reducing transpiration.
9
Easy
9 of 65
Understanding
+4 | -1
Growing season is the season of plants in which there is
View answer and explanation
Correct option: A
Maximum vegetative growth
Option A (Maximum vegetative growth) is correct because the growing season is defined as the period when environmental conditions are favorable for plant growth, leading to maximum vegetative development.
10
Easy
10 of 65
Analyzing
+4 | -1
Choose the mismatched pair.
View answer and explanation
Correct option: A
Cytokinin - respond to wounds and stresses
Option A (Cytokinin - respond to wounds and stresses) is the mismatched pair because cytokinins primarily promote cell division and delay senescence, while response to wounds and stresses is mainly associated with other hormones like ethylene and jasmonic acid.
11
Easy
11 of 65
Understanding
+4 | -1
Growth of plant is
View answer and explanation
Correct option: C
Both (a) and (b)
Option C (Both (a) and (b)) is correct because plant growth exhibits both arithmetic and geometric phases, depending on the stage of development and environmental conditions.
12
Easy
12 of 65
Remembering
+4 | -1
Temperature required for vernalisation is
View answer and explanation
Correct option: C
0℃ to 5℃
The correct answer is C (0℃ to 5℃) because this is the optimal temperature range for effective vernalisation in most plant species.
13
Easy
13 of 65
Understanding
+4 | -1
Photoperiodism is
View answer and explanation
Correct option: B
Effect of day length on flowering of a plant.
Option B (Effect of day length on flowering of a plant) is correct because photoperiodism is the physiological response of plants to the length of day or night.
14
Easy
14 of 65
Analyzing
+4 | -1
(A): In most biological systems, the initial growth is slow (lag phase).
(R): With limited nutrient supply, the growth slows down, leading to a stationary phase.
(R): With limited nutrient supply, the growth slows down, leading to a stationary phase.
View answer and explanation
Correct option: B
Both are true and R is not the correct explanation of A
Option B is correct because both the assertion and reason are true, but the reason does not explain why the initial growth is slow (lag phase).
15
Easy
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Remembering
+4 | -1
Which of the following is essential for plant growth?
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because water, oxygen, and nutrients are all essential for plant growth and survival.
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16
Easy
16 of 65
Remembering
+4 | -1
Florigen is produced in the region of
View answer and explanation
Correct option: A
Leaves
Option A (Leaves) is correct because florigen, the hypothetical flowering hormone, is believed to be produced in the leaves under inductive photoperiodic conditions.
17
Easy
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Understanding
+4 | -1
Growth rate means:
View answer and explanation
Correct option: B
Increased growth per unit time
Option B (Increased growth per unit time) is correct because growth rate is defined as the increase in growth per unit time.
18
Easy
18 of 65
Understanding
+4 | -1
Which can counteract the abscission – promoting effect of ethylene?
View answer and explanation
Correct option: C
Auxin
Option C (Auxin) is correct because auxin can inhibit abscission and counteract the effects of ethylene.
19
Easy
19 of 65
Understanding
+4 | -1
The biological clock measures the length at each night by the
View answer and explanation
Correct option: A
Relative amount of red absorbing and far/red absorbing phytochrome present at dawn
Option A is correct because the ratio of red-absorbing phytochrome (Pr) to far-red-absorbing phytochrome (Pfr) at dawn provides information about the length of the night, influencing photoperiodic responses.
20
Easy
20 of 65
Understanding
+4 | -1
Select the mismatched pair about PGRs
View answer and explanation
Correct option: A
Cytokinins - Used to prepare weed-free lawns
Option A (Cytokinins - Used to prepare weed-free lawns) is correct because auxins, not cytokinins, are used in weed-free lawns as herbicides.
21
Easy
21 of 65
Understanding
+4 | -1
Identify the correct pair of combinations
I) Zeatin – Adenine derivatives – overcoming apicaldominance
II) - indole compound – effective in fruit ripening
III) ABA – Carotenoid derivative – induction of parthenocarpy
IV) - Terpene – Bolting in cabbage
I) Zeatin – Adenine derivatives – overcoming apicaldominance
II) - indole compound – effective in fruit ripening
III) ABA – Carotenoid derivative – induction of parthenocarpy
IV) - Terpene – Bolting in cabbage
View answer and explanation
Correct option: C
I, IV
Option C (I, IV) is correct because Zeatin is an adenine derivative that overcomes apical dominance, and GA3 is a terpene that induces bolting in cabbage.
22
Easy
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Remembering
+4 | -1
Natural and synthetic-auxin (IAA, NAA, IBA, 2-4-D) have been used extensively in
View answer and explanation
Correct option: C
Both (1) and (2)
Option C (Both (1) and (2)) is correct because both natural and synthetic auxins are widely used in agriculture for purposes like weed control and in horticulture for promoting rooting and fruit development.
23
Easy
23 of 65
Remembering
+4 | -1
SDP also called
View answer and explanation
Correct option: B
Long night plant
Option B is correct because Short Day Plants (SDP) require a long period of darkness (long night) to initiate flowering.
24
Easy
24 of 65
Remembering
+4 | -1
Auxin in plant means for
View answer and explanation
Correct option: A
Cell elongation
Option A (Cell elongation) is correct because auxin primarily promotes cell elongation, especially in stems and roots.
25
Easy
25 of 65
Remembering
+4 | -1
The most common auxin is
View answer and explanation
Correct option: D
IAA
Option D (IAA) is correct because Indole-3-acetic acid (IAA) is the most common naturally occurring auxin in plants.
26
Easy
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Understanding
+4 | -1
Large amount of ethylene is synthesised by
View answer and explanation
Correct option: C
Senescence tissues and ripening fruits
Option C (Senescence tissues and ripening fruits) is correct because ethylene production is highest in senescing tissues and ripening fruits.
27
Easy
27 of 65
Analyzing
+4 | -1
Identify the phytohormone on the basis of below given features and select the correct statement for it.
a. Induces cell division
b. First isolated from human urine
a. Induces cell division
b. First isolated from human urine
View answer and explanation
Correct option: B
Controls xylem differentiation
Option B (Controls xylem differentiation) is correct because Cytokinins, initially discovered as promoting cell division, also play a role in xylem differentiation.
28
Easy
28 of 65
Remembering
+4 | -1
The ability of plants to follow different pathway to form different structures in response to environment is called
View answer and explanation
Correct option: A
Plasticity
Option A (Plasticity) is correct because plasticity refers to the ability of plants to alter their development and morphology in response to environmental conditions.
29
Easy
29 of 65
Remembering
+4 | -1
The site of perception of light is
View answer and explanation
Correct option: C
Leaves
Option C (Leaves) is correct because leaves contain photoreceptors like phytochromes and cryptochromes that perceive light signals and initiate photomorphogenic responses.
30
Easy
30 of 65
Understanding
+4 | -1
Assertion(A): Ethylene increases surface area of absorption.
Reason(R): Ethylene promotes root hair formation.
Reason(R): Ethylene promotes root hair formation.
View answer and explanation
Correct option: A
Both Assertion and Reason are true and Reason is the correct explanation of Assertion
Option A is correct because ethylene promotes root hair formation, which increases the surface area for absorption.
Revision notes and key takeaways
Review PLANT GROWTH AND DEVELOPMENT in your textbook or class notes, then use this set to check your understanding.
Key Takeaways
- ✓ This set contains 65 single-correct-answer MCQs on PLANT GROWTH AND DEVELOPMENT.
- ✓ Try each question before opening its answer. Read the explanation where one is available.
- ✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.
Showing 1-30 of 65 questions