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NEET • BIOLOGY • PLANT GROWTH AND DEVELOPMENT
Plant growth and development practice · Hard
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31
Hard
31 of 50
Remembering
+4 | -1
The ability of producing different kinds of structures at different phases of life is called?
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Correct option: A
Plasticity
Option A (Plasticity) is correct because plasticity refers to the ability of an organism to produce different kinds of structures at different phases of life or in response to environmental conditions.
32
Hard
32 of 50
Understanding
+4 | -1
Assertion(A): All the cells of living plant cannot show dedifferentiation
Reason(R): Ability of permanent cell to regain the power of division under certain conditions is called dedifferentiation.
Reason(R): Ability of permanent cell to regain the power of division under certain conditions is called dedifferentiation.
View answer and explanation
Correct option: B
Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
Option B (Both Assertion and Reason are true and Reason is not the correct explanation of Assertion) is correct because the assertion is true that not all cells can dedifferentiate, and the reason is also true about the definition of dedifferentiation, but the reason doesn't explain why the assertion is true.
33
Hard
33 of 50
Understanding
+4 | -1
Rye has two kinds of varieties; autumn and spring varieties. The correct statement about them is
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Correct option: C
Spring variety is planted in spring while the autumn variety is planted in autumn.
The correct answer is C (Spring variety is planted in spring while the autumn variety is planted in autumn) because the planting time is the primary difference between spring and autumn rye varieties.
34
Hard
34 of 50
Understanding
+4 | -1
What would happen if the meristem ceases to divide?
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Correct option: D
Plant growth ceases
Option D (Plant growth ceases) is correct because meristematic cells are responsible for cell division and growth; if they stop dividing, growth stops.
35
Hard
35 of 50
Remembering
+4 | -1
In organs of plants there is a variation in rate of growth. It is first slow, then accelerated upto maximum and slows down to stand still. The period of vigorous growth is known as
View answer and explanation
Correct option: D
Log phase
Option D (Log phase) is correct because the period of vigorous growth is known as the log phase or exponential phase.
36
Hard
36 of 50
Understanding
+4 | -1
Assertion (A): Winter varieties off wheat & rye are planted in autumn not in spring.
Reason (R): If winter varieties planted in spring normally they fail to flower or produce mature grain within a span of flowering season.
Reason (R): If winter varieties planted in spring normally they fail to flower or produce mature grain within a span of flowering season.
View answer and explanation
Correct option: A
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
The correct answer is A (Both (A) & (R) are true and the (R) is the correct explanation of the (A)) because winter varieties require vernalization and will not flower properly if planted in spring.
37
Hard
37 of 50
Understanding
+4 | -1
The process of developing permanent cells from meristematic cells which are produced from permanent cells is called as
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Correct option: B
Redifferentiation
Option B (Redifferentiation) is correct because it describes the process where dedifferentiated cells regain their ability to differentiate into specific cell types.
38
Hard
38 of 50
Understanding
+4 | -1
Assertion (A): Vernalisation prevents precocious reproductive development till the plant matures.
Reason (R): Vernalisation leads to reduction in vegetative life of plant.
Reason (R): Vernalisation leads to reduction in vegetative life of plant.
View answer and explanation
Correct option: A
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
The correct answer is A (Both (A) & (R) are true and the (R) is the correct explanation of the (A)) because vernalization prevents premature flowering and reduces the vegetative phase, allowing the plant to mature before reproduction.
39
Hard
39 of 50
Application
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A primary root grows from 5 cm – 19 cm in a week. Calculate the relative growth rate over the period (1 day)
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Correct option: B
Option B (40%) is correct because the relative growth rate is the change in length divided by the initial length, expressed as a percentage, and then divided by the number of days.
40
Hard
40 of 50
Understanding
+4 | -1
Decapitation usually results in the growth of
View answer and explanation
Correct option: A
Lateral buds
Option A is correct because decapitation removes the source of apical dominance (the apical bud), allowing the lateral buds to grow.
41
Hard
41 of 50
Understanding
+4 | -1
Assertion(A): Phototropism in plants is caused by auxin
Reason(R): The plant sbowing bending has more elongated cells on the illuminated side
Reason(R): The plant sbowing bending has more elongated cells on the illuminated side
View answer and explanation
Correct option: C
Assertion is true but Reason is false
Option C (Assertion is true but Reason is false) is correct because phototropism is caused by auxin, but the bending is due to more elongated cells on the shaded side, not the illuminated side.
42
Hard
42 of 50
Remembering
+4 | -1
Photoperiodic stimulus is received by
View answer and explanation
Correct option: A
Leaves
Option A (Leaves) is correct because leaves contain photoreceptors like phytochrome that detect changes in day length and initiate the photoperiodic response.
43
Hard
43 of 50
Understanding
+4 | -1
Assertion (A): Growth, at cellular level, is measured by a variety of parameters some of which are: increase in fresh weight, dry weight, length, area, volume and cell number.
Reason (R): Growth, at a cellular level, is principally a consequence of increase in the amount of protoplasm and increase in protoplasm is difficult to measure directly.
Reason (R): Growth, at a cellular level, is principally a consequence of increase in the amount of protoplasm and increase in protoplasm is difficult to measure directly.
View answer and explanation
Correct option: A
Both (A) & (R) are true and the (R) is 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 growth at the cellular level is measured by various parameters because directly measuring the increase in protoplasm is difficult.
44
Hard
44 of 50
Understanding
+4 | -1
What will happen, if terminal bud of a plant is removed?
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Correct option: B
The lateral buds will grow
Option B (The lateral buds will grow) is correct because the terminal bud inhibits lateral bud growth due to apical dominance, so removing it releases this inhibition.
45
Hard
45 of 50
Remembering
+4 | -1
The hormone widely used in tea plantations for hedge making?
View answer and explanation
Correct option: B
Auxins
Option B (Auxins) is correct because auxins promote apical dominance and lateral bud suppression, which is useful for hedge making in tea plantations.
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46
Hard
46 of 50
Analyzing
+4 | -1
Choose the odd one for DNP
View answer and explanation
Correct option: D
Henbane
Option D (Henbane) is the odd one out because Tomato, Cucumber, and Pepper are all fruits (developed from the ovary), while Henbane is a medicinal plant known for its alkaloids.
47
Hard
47 of 50
Understanding
+4 | -1
Assertion (A): In day neutral plants there is no correlation between exposure to light duration and flowering response.
Reason (R): In Day neutral plant there is no specific requirement of light and dark hours.
Reason (R): In Day neutral plant there is no specific requirement of light and dark hours.
View answer and explanation
Correct option: A
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
The correct answer is A (Both (A) & (R) are true and the (R) is the correct explanation of the (A)) because day-neutral plants flower independently of day length, and this is because they don't have a specific light/dark requirement.
48
Hard
48 of 50
Understanding
+4 | -1
De – differentiation is:
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Correct option: A
Regaining the lost capacity of division by living cells
Option A (Regaining the lost capacity of division by living cells) is correct because dedifferentiation is the process where differentiated cells revert to a less specialized state and regain the ability to divide.
49
Hard
49 of 50
Remembering
+4 | -1
Which one of the following inhibits seed germination for a particular period?
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Correct option: D
Dormancy
Option D (Dormancy) is correct because dormancy is a period of suspended growth and metabolic activity in seeds, preventing germination until favorable conditions arise.
50
Hard
50 of 50
Understanding
+4 | -1
Etiolated seedlings are produced by germinating seeds and keeping them in total darkness. Under which of the following conditions will plants kept in the dark-begin to synthesise chlorophyll?
View answer and explanation
Correct option: C
After being given a pulse of red light followed by a pulse of far-red light.
Option C is correct because the synthesis of chlorophyll requires red light, and the effect of red light can be reversed by far-red light.
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 31-50 of 50 questions