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Q. No.Optimum temperature required for the proper growth in most of the plants is
1. 30-45°C
2. 10-20°C
3. 28-30°C
4. 0-10°C
Subtopic: Growth |
55%
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Find odd one w.r.t. tissues developed by the process of redifferentiation
1. Secondary cortex
2. Secondary xylem
3. Phellem
4. Phellogen
1. Secondary cortex
2. Secondary xylem
3. Phellem
4. Phellogen
Subtopic: Growth |
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Which of the given plant shows plasticity in response to its prevailing environment?
1. Larkspur
2. Buttercup
3. Cotton
4. Coriander
1. Larkspur
2. Buttercup
3. Cotton
4. Coriander
Subtopic: Development |
86%
From NCERT
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Who performed the experiments using canary grass to demonstrate the curvature of tip?
1. E. Kurosawa
2. F. Skoog
3. Went
4. Darwin
1. E. Kurosawa
2. F. Skoog
3. Went
4. Darwin
Subtopic: Growth Hormones & Auxin |
73%
From NCERT
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Subtopic: Growth Hormones & Auxin |
74%
From NCERT
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During differentiation of xylem
1. End walls are lost in tracheids
2. Loss of protoplasm occurs in vessels
3. Lignified thickening develops in tracheary elements
4. More than one option is correct
1. End walls are lost in tracheids
2. Loss of protoplasm occurs in vessels
3. Lignified thickening develops in tracheary elements
4. More than one option is correct
Subtopic: Auxin Function |
77%
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2, 4-D is
1. Widely used to kill monocots
2. Effective weedicides against broad-leaved plants
3. Used to prevent lodging and root initiation
4. Used to promote flowering in pineapple and mango
1. Widely used to kill monocots
2. Effective weedicides against broad-leaved plants
3. Used to prevent lodging and root initiation
4. Used to promote flowering in pineapple and mango
Subtopic: Growth Hormones & Auxin |
74%
From NCERT
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Select an incorrect statement
1. Auxin promotes xylem differentiation
2. NAA is used to overcome apical dominance
3. Auxins help to prevent fruit and leaf drop at early stages
4. Auxins prevent lodging of cereals
1. Auxin promotes xylem differentiation
2. NAA is used to overcome apical dominance
3. Auxins help to prevent fruit and leaf drop at early stages
4. Auxins prevent lodging of cereals
Subtopic: Growth Hormones & Auxin | Cytokinin |
72%
From NCERT
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Auxins
1. Were first isolated in agar by PaaI
2. Are synthesised using tryptophan as precursor
3. Are found always as bound with amines
4. Are synthesised in shoot apices only
1. Were first isolated in agar by PaaI
2. Are synthesised using tryptophan as precursor
3. Are found always as bound with amines
4. Are synthesised in shoot apices only
Subtopic: Growth Hormones & Auxin |
53%
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Which of the following plant hormone is used to speed up the malting process in brewing industry?
1. GA3
2. Ethylene
3. Cytokinin
4. Auxin
Subtopic: Gibberellin |
91%
From NCERT
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