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NEET • BIOLOGY • PLANT GROWTH AND DEVELOPMENT
Plant growth and development practice · Mixed difficulty
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Showing 181-210 of 222 questions
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181
Medium
181 of 222
Remembering
+4 | -1
IAA is derived from or which of the following is involved in the synthesis of a plant IAA and vasoconstrides cerotonin?
View answer and explanation
Correct option: A
Tryptophan
The correct answer is A (Tryptophan) because IAA (Indole-3-acetic acid), a common auxin, is synthesized from the amino acid tryptophan.
182
Hard
182 of 222
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.
183
Medium
183 of 222
Understanding
+4 | -1
The problem of necrosis and gradual senescence, while performing tissue culture can be overcome by
View answer and explanation
Correct option: B
Spraying cytokinins
The correct answer is B (Spraying cytokinins) because cytokinins promote cell division and differentiation, which can help prevent necrosis and senescence in tissue culture.
184
Medium
184 of 222
Analyzing
+4 | -1
Choose odd one out w.r.t. function of one of the most widely used PGR in agriculture i.e. ethylene
View answer and explanation
Correct option: B
Apical hook formation in rice seedlings
Option B (Apical hook formation in rice seedlings) is the odd one out because while ethylene is involved in apical hook formation in dicot seedlings, it's not its primary function in rice seedlings, and the other options are more widely used applications of ethylene in agriculture.
185
Hard
185 of 222
Understanding
+4 | -1
What will happen, if terminal bud of a plant is removed?
View answer and explanation
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.
186
Medium
186 of 222
Remembering
+4 | -1
Which plant hormone promotes seed dormancy, bud dormancy and causes stomatal closure?
View answer and explanation
Correct option: B
Abscisic acid
Option B (Abscisic acid) is correct because abscisic acid (ABA) is known to promote seed and bud dormancy and cause stomatal closure.
187
Easy
187 of 222
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.
188
Medium
188 of 222
Understanding
+4 | -1
Maximum elongation takes place in
View answer and explanation
Correct option: D
Cell wall and membrane
Option D (Cell wall and membrane) is correct because the cell wall and membrane are the structures that physically expand during cell elongation.
189
Medium
189 of 222
Analyzing
+4 | -1
Assertion: Flowering depends only on a
combination of light and dark exposure in some
plants.
Reason: The site of perception of light or dark
duration are the shoot apices of plants.
combination of light and dark exposure in some
plants.
Reason: The site of perception of light or dark
duration are the shoot apices of plants.
View answer and explanation
Correct option: D
If both Assertion and Reason are false
The correct answer is D (If both Assertion and Reason are false) because flowering depends on more than just light and dark exposure (temperature, hormones), and the site of perception is the leaves, not the shoot apices.
190
Hard
190 of 222
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.
191
Medium
191 of 222
Remembering
+4 | -1
Environment heterophylly is seen in
View answer and explanation
Correct option: D
Buttercup
Option D (Buttercup) is correct because buttercup exhibits environment heterophylly, showing different leaf forms in aquatic and terrestrial environments.
192
Hard
192 of 222
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.
193
Medium
193 of 222
Remembering
+4 | -1
Intrinsic heterophylly is found in all except?
View answer and explanation
Correct option: B
Buttercup
Option B (Buttercup) is correct because buttercup exhibits heterophylly due to environmental factors, not intrinsic factors.
194
Easy
194 of 222
Understanding
+4 | -1
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.
195
Easy
195 of 222
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.
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196
Easy
196 of 222
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.
197
Hard
197 of 222
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.
198
Medium
198 of 222
Remembering
+4 | -1
Name the process when dedifferentiated cells again loss the ability to divide and get mature?
View answer and explanation
Correct option: B
Redifferentiation
Option B (Redifferentiation) is correct because redifferentiation is the process where dedifferentiated cells lose the ability to divide and become mature.
199
Medium
199 of 222
Understanding
+4 | -1
During differentiation, the cells undergo few to major structural changes in their
View answer and explanation
Correct option: C
Both (a) and (b)
Option C (Both (a) and (b)) is correct because during differentiation, cells undergo structural changes in both the cell wall and protoplasm.
200
Easy
200 of 222
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.
201
Easy
201 of 222
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.
202
Medium
202 of 222
Understanding
+4 | -1
Cells in the meristematic phase exhibits all of the given characteristics, except
View answer and explanation
Correct option: D
Increased vacuolation
Option D (Increased vacuolation) is correct because cells in the meristematic phase typically have small vacuoles, not increased vacuolation.
203
Medium
203 of 222
Understanding
+4 | -1
How does pruning help in making the hedge dense?
View answer and explanation
Correct option: B
It frees axillary buds from apical dominance
Option B is correct because pruning removes the apical bud, which is the source of apical dominance, allowing the axillary buds to grow and make the hedge dense.
204
Medium
204 of 222
Remembering
+4 | -1
Parthenocarpy in tomatoes is induced by
View answer and explanation
Correct option: B
Auxin
Option B (Auxin) is correct because auxin application can induce parthenocarpy (fruit development without fertilization) in tomatoes, leading to seedless fruit production.
205
Medium
205 of 222
Analyzing
+4 | -1
Compare the statement I and II and choose the correct option.
Statement I: In the flowering plants due to higher accumulation of auxins
dormancy of lateral buds occurs.
Statement II: In Maryland Mammoth (a tobacco variety) flowering occurred
at different time at different latitude due to gibberellins
concentration.
Statement I: In the flowering plants due to higher accumulation of auxins
dormancy of lateral buds occurs.
Statement II: In Maryland Mammoth (a tobacco variety) flowering occurred
at different time at different latitude due to gibberellins
concentration.
View answer and explanation
Correct option: A
Statement I is true, but II is false
Option A is correct because high auxin levels promote apical dominance, inhibiting lateral bud growth, while the flowering time of Maryland Mammoth is affected by photoperiod, not gibberellin concentration.
206
Hard
206 of 222
Understanding
+4 | -1
De – differentiation is:
View answer and explanation
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.
207
Medium
207 of 222
Remembering
+4 | -1
Heterophyllous development due to environment is seen in
View answer and explanation
Correct option: D
Buttercup
Option D (Buttercup) is correct because buttercup exhibits heterophyllous development due to environmental factors, showing different leaf forms in aquatic and terrestrial environments.
208
Hard
208 of 222
Remembering
+4 | -1
Which one of the following inhibits seed germination for a particular period?
View answer and explanation
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.
209
Medium
209 of 222
Remembering
+4 | -1
The hormone involved in metabolism of food material in cereal grains during germination is
View answer and explanation
Correct option: C
Gibberellin
Option C (Gibberellin) is correct because gibberellins stimulate the production of amylase, which breaks down starch into sugars, providing energy for germination in cereal grains.
210
Hard
210 of 222
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 181-210 of 222 questions