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NEET • BIOLOGY • PLANT GROWTH AND DEVELOPMENT
Plant growth and development practice · Mixed difficulty
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Showing 1-30 of 222 questions
1
Medium
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Analyzing
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Assertion(A): Dedifferentiated cells can only undergo redifferentiation.
Reason(R): Cork and secondary phloem are the products of differentiation
Reason(R): Cork and secondary phloem are the products of differentiation
View answer and explanation
Correct option: C
Assertion is true but Reason is false
Option D is correct because both the assertion and the reason are false. Dedifferentiated cells can undergo both redifferentiation and dedifferentiation again, and cork and secondary phloem are products of redifferentiation, not just differentiation.
2
Medium
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Understanding
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Plants follow …A… pathways in response to environment or phases of life to form different kind of structures. This ability is called …B… Complete the given statement with the correct combination of options
View answer and explanation
Correct option: C
A-different; B-plasticity
Option C (A-different; B-plasticity) is correct because plants follow different pathways to form different structures in response to the environment, and this ability is called plasticity.
3
Medium
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Remembering
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Rapid and dramatic increase in shoot length is called
View answer and explanation
Correct option: B
Bolting
Option B (Bolting) is correct because bolting refers to the rapid elongation of a stem, often in flowering plants.
4
Medium
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Application
+4 | -1
Some plants were kept under 15 hours of daylight and 9 hours of night. They started producing flowers. However in some of them night was interrupted by a brief flash of light resulting in failure of flowering to take place. This plant is a-
View answer and explanation
Correct option: B
SDP
The correct answer is B (SDP) because the plant flowers under short day conditions (15 hours of daylight, 9 hours of night) but flowering is inhibited by a flash of light during the night, which is characteristic of short-day plants.
5
Medium
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Analyzing
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Which of the following statements are fals regarding ethephon?
(A) A source of ethylene.
(B) It is slowly absorbed and transported within the plant to release ethylene rapidly
(C) It causes reduced abscission in flowers anc fruits of cotton.
(D) Supresses the internode elongation in deep water rice plants.
(A) A source of ethylene.
(B) It is slowly absorbed and transported within the plant to release ethylene rapidly
(C) It causes reduced abscission in flowers anc fruits of cotton.
(D) Supresses the internode elongation in deep water rice plants.
View answer and explanation
Correct option: B
B, C, D only
The correct answer is B (B, C, D only) because statements B, C, and D are false regarding ethephon.
6
Medium
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Remembering
+4 | -1
Heterophylly can be observed in
I. cotton
II. coriander
III. larkspur
Select the right option
I. cotton
II. coriander
III. larkspur
Select the right option
View answer and explanation
Correct option: A
I, II and III
Option A (I, II and III) is correct because cotton, coriander, and larkspur all exhibit heterophylly.
7
Medium
7 of 222
Remembering
+4 | -1
Measurement and comparison of total growth in geometrical growth of a plant per unit time is called
View answer and explanation
Correct option: A
Absolute growth rate
Option A (Absolute growth rate) is correct because absolute growth rate refers to the measurement and comparison of total growth per unit time.
8
Medium
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Application
+4 | -1
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
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
View answer and explanation
Correct option: D
I and II
The correct answer is A (I and II) because if a plant needs 10 hours of darkness to flower, it will flower when it gets 10 hours or more of darkness. Therefore, 14 hours day period (10 hours dark) and 10 hours dark period will induce flowering.
9
Easy
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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).
10
Medium
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Analyzing
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There are two plants A and B with respective crictical photoperiod of 13 hours and 11 hours. When they are exposed to light for a period of 12 hours, it initiated flowering in both. Which of the following conclusions is most appropriate for these plants?
View answer and explanation
Correct option: C
Plant A is short day plant and plant is long day plant
Option D is correct because plant A, with a critical photoperiod of 13 hours, flowers under 12 hours of light (shorter than critical), making it a long-day plant. Plant B, with a critical photoperiod of 11 hours, flowers under 12 hours of light (longer than critical), making it a short-day plant.
11
Hard
11 of 222
Remembering
+4 | -1
Heterophyllous aquatic plant of the following is?
View answer and explanation
Correct option: D
Butter cup
Option D (Butter cup) is correct because buttercup is a heterophyllous aquatic plant, exhibiting different leaf forms when submerged in water compared to when growing on land.
12
Medium
12 of 222
Understanding
+4 | -1
Plant hormones which show the antagonist effects to auxin w.r.t. 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.
13
Medium
13 of 222
Remembering
+4 | -1
The existence of two types of leaves in the same plant, is called
View answer and explanation
Correct option: C
Heterophylly
Option C (Heterophylly) is correct because heterophylly is the phenomenon where a plant exhibits different types of leaves on the same individual.
14
Medium
14 of 222
Analyzing
+4 | -1
Find odd one out w.r.t. ethylene functions.
View answer and explanation
Correct option: D
Stimulation of root formation on stem cuttings
Option D (Stimulation of root formation on stem cuttings) is the odd one out because it is a function primarily associated with auxins, while the other options are functions of ethylene.
15
Hard
15 of 222
Understanding
+4 | -1
In tissue culture experiments, leaf mesophyll cells are put in a culture medium to form callus. This
phenomenon may be called as
phenomenon may be called as
View answer and explanation
Correct option: D
Dedifferentiation
Option D (Dedifferentiation) is correct because it describes the process where specialized cells like mesophyll cells revert to an unspecialized state to form callus.
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16
Medium
16 of 222
Application
+4 | -1
It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?
View answer and explanation
Correct option: A
Auxin and Ethylene
Option A (Auxin and Ethylene) is correct because both auxin and ethylene can induce flowering in pineapple plants.
17
Easy
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Understanding
+4 | -1
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.
18
Medium
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Understanding
+4 | -1
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
I. fresh weight
II. dry weight
III. length, area and volume
IV. cell number
Choose the correct option
View answer and explanation
Correct option: D
I, II, III and IV
The correct answer is D (I, II, III and IV) because growth in plants is measured by increases in fresh weight, dry weight, length, area, volume, and cell number.
19
Easy
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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.
20
Medium
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Remembering
+4 | -1
Induction of flowering by low temperature treatment is
View answer and explanation
Correct option: A
Vernalization
The correct answer is A (Vernalization) because vernalization is specifically the induction of flowering by exposure to low temperatures.
21
Easy
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Understanding
+4 | -1
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.
22
Easy
22 of 222
Remembering
+4 | -1
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.
23
Medium
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Application
+4 | -1
A primary root grows from to in a week. The absolute and relative growth rates of the root respectively are.
View answer and explanation
Correct option: A
day and
Option A (2 cm/day and 40%) is correct because the absolute growth rate is the change in length per day, and the relative growth rate is the percentage increase in length.
24
Easy
24 of 222
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.
25
Easy
25 of 222
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.
26
Easy
26 of 222
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.
27
Hard
27 of 222
Remembering
+4 | -1
is the expression of exponential growth, in which “r” denotes?
View answer and explanation
Correct option: C
Relative growth rate
Option C (Relative growth rate) is correct because in the exponential growth equation, 'r' denotes the relative growth rate.
28
Medium
28 of 222
Analyzing
+4 | -1
Find odd one w.r.t. the results of dedifferentiation.
View answer and explanation
Correct option: D
Secondary cortex
Option D (Secondary cortex) is correct because cork cambium, interfascicular cambium, and wound cambium are all direct results of dedifferentiation, while the secondary cortex is a product of differentiation from the cork cambium.
29
Medium
29 of 222
Analyzing
+4 | -1
Mark odd one w.r.t. defining feature of life.
View answer and explanation
Correct option: B
Growth
Option B is correct because while growth is a characteristic of living organisms, it is not a defining feature as non-living things can also exhibit growth (e.g., crystal growth).
30
Hard
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Understanding
+4 | -1
Assertion (A): A sigmoid curve is a characteristic of living organism growing in a natural environment.
Reason (R): It is typical for all cells, tissues and organs of a plant.
Reason (R): It is typical for all cells, tissues and organs of a plant.
View answer and explanation
Correct option: B
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
Option A (Both (A) & (R) are true and the (R) is the correct explanation of the (A)) is correct because the sigmoid curve represents the typical growth pattern of living organisms due to limited resources, and this applies to cells, tissues, and organs.
Revision notes and key takeaways
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Key Takeaways
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