Parthenocarpy in tomato plants can be induced by:
1. | Auxins | 2. | Gibberellins |
3. | ABA | 4. | Cytokinins |
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PGR causing the closure of stomata in response to water stress is:
1. | ABA | 2. | Gibberellins |
3. | Auxin | 4. | Cytokinin |
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When compared to their normal sized counterparts, the dwarf mutant varieties of a plant generally produce less:
1. | Auxins | 2. | Gibberellins |
3. | Ethylene | 4. | ABA |
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If we plot the parameter of growth against time for a living organism growing in a natural environment, the shaped of the curve is expected to be:
1. | Linear | 2. | Rectangular hyperbola |
3. | Sigmoid | 4. | Bell shaped |
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Identify the plant growth regulator that is not correctly matched to its chemical nature in the following given options:
|
PGR |
Chemical nature |
1. |
Ethylene |
Gaseous |
2. |
Adenine derivatives |
Kinetin |
3. |
Indole compounds |
Auxins |
4. |
Terpenes |
Abscisic acid |
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Plant growth is generally indeterminate because of:
1. Phenotypic plasticity
2. Geometrical growth shown by all organs
3. Presence of meristems
4. Terminally differentiated cells
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Match each item in Column I with one in Column II and select the correct answer from the codes given:
|
PGR |
|
Chemical nature |
A |
Indole compounds |
P |
Gibberellins |
B |
Adenine derivatives |
Q |
ABA |
C |
Terpenes |
R |
Auxins |
D |
Derivatives of carotenoids |
S |
Cytokinins |
Codes
|
A |
B |
C |
D |
1. |
R |
S |
P |
Q |
2. |
R |
S |
Q |
P |
3. |
S |
R |
P |
Q |
4. |
S |
R |
Q |
P |
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In most situations, ABA acts as an antagonist to:
1. | Auxins | 2. | GAs |
3. | Ethylene | 4. | Cytokinins |
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Which of the following is not a use of plant PGR ethylene?
1. Initiation of flowering and synchronizing fruit set in pineapples.
2. Induction of flowering in mango.
3. Ethephon, most common source of ethylene, hastens fruit ripening in tomatoes.
4. Induction of parthenocarpy in tomatoes.
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Which of the following is not an inhibitory substance governing seed dormancy?
1. Abscisic acid
2. Phenolic acid
3. Para-ascorbic acid
4. Gibberellic acid