Q. No.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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PGR causing the closure of stomata in response to water stress is:
| 1. | ABA | 2. | Gibberellins |
| 3. | Auxin | 4. | Cytokinin |
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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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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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Parthenocarpy in tomato plants can be induced by:
| 1. | Auxins | 2. | Gibberellins |
| 3. | ABA | 4. | Cytokinins |
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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
Match the following concerning the activity/function and the phytohormone involved:-
| (a) | Fruit ripener | (i) | Abscisic acid |
| (b) | Herbicide | (ii) | GA 3 |
| (c) | Bolting agent | (iii) | 2, 4-D |
| (d) | Stress hormone | (iv) | Ethephon |
Select the correct option from following:-
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iii) | (iv) | (i) |
| 2. | (iii) | (iv) | (ii) | (i) |
| 3. | (iv) | (iii) | (ii) | (i) |
| 4. | (iv) | (ii) | (i) | (iii) |
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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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