In most situations, which of the following acts as an antagonist to GAs?
1. ABA
2. IAA
3. Kinetin
4. Ethylene
Identify the option where all the columns are not correctly matched:
|
|
PGR |
Nature |
Actions |
|
1. |
Auxin |
Indole compounds |
Apical dominance, Flowering in pineapples, Parthenocarpy in tomatoes |
|
2. |
Cytokinin |
Adenine derivative |
Cell division, Adventitious shoot formation, Delay in leaf senescene |
|
3. |
Gibberellin |
Terpene |
Increase in length |
|
4 . |
ABA |
Carotenoid derivative |
Closure of stomata in water stress, inducing seed dormancy, inducing flowering in mango |
Primary and secondary growth are inhibited by:
1. Auxins
2. Gibberellins
3. Abscisic acid
4. Cytokinins
Which one of the following growth regulators is known as "stress hormone" ?
1. abscisic acid
2. Ethylene
3. GA3
4. lndole acetic acid
Which one of the following acids is a derivative of carotenoids?
1. Indole-butyric acid
2. Indole-3-acetic acid
3. Gibberellic acid
4. Abscisic acid
Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in
| 1. | vessels and tracheid differentiation |
| 2. | leaf abscission |
| 3. | annual plants |
| 4. | floral parts |
Abscisic acid is known as the stress hormone because it
| 1. | breaks seed dormancy |
| 2. | induces flowering |
| 3. | promotes leaf fall |
| 4. | promotes closure of stomata |
One hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses.They are respectively:-
| 1. | Gibberellin, Auxin, Ethylene |
| 2. | Auxin, Gibberellin, Cytokinin |
| 3. | Gibberellin, Auxin, ABA |
| 4. | Auxin, Gibberellin, ABA |
Identify the incorrect statement about ABA growth regulator.
| 1. | It increases the tolerance of plants against different stresses. |
| 2. | It acts as general plant growth inhibitor and inhibitor of metabolism. |
| 3. | It helps in seed maturation and dormancy. |
| 4. | It promotes morphogenesis and differentiation of shoots. |
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