Q. No.PGR causing the closure of stomata in response to water stress is:
| 1. | ABA | 2. | Gibberellins |
| 3. | Auxin | 4. | Cytokinin |
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 |
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 |
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 |
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. |
How does pruning help in making the hedge dense?
| 1. | It induces the differentiation of new shoots from the rootstock |
| 2. | It frees axillary buds from apical dominance |
| 3. | The apical shoots grow faster after pruning |
| 4. | It releases wound hormones |
Which of the following is not a function of auxins in plants?
| 1. | Promotion of flowering in pineapples |
| 2. | Induction of parthenocarpy in tomatoes. |
| 3. | Apical dominance |
| 4. | Promotion of female flowers in cucumber |
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) |
© 2025 GoodEd Technologies Pvt. Ltd.