Q. No.| A. | _______ hormone is most widely used PGR in agriculture. |
| B. | _______ hormone is related with Richmond Lang effect. |
| A | B | |
| 1. | Auxin | CK |
| 2. | Auxin | GA |
| 3. | Ethylene | CK |
| 4. | ABA | CK |
Ethephon hastens the fruit ripening in tomatoes and apple and accelerates abscission in flowers and fruits. Above statement indicates that ethephon must release –
1. ABA
2. C2H4
3. IAA
4. GA7
The phytohormone which promotes rapid internode elongation in deep water rice plant is
| 1. | Gibberellins | 2. | Ethylene |
| 3. | Auxin | 4. | Cytokinin |
In a flowering plant if auxins are not synthesizing, then effects which would most probably be seen in this plant are
| i | Dropping of fruits at early stage. |
| ii | Inhibition in the growth of lateral buds. |
| iii | Delayed abscission of older mature leaves. |
| iv | Inhibition of cell division in cambium. |
| 1. | i, ii and iv |
| 2. | i, iii and iv |
| 3. | ii and iv only |
| 4. | i and iii only |
Select the correct match
| 1. | Auxin | – Promote seed dormancy |
| 2. | Cytokinin | – Overcoming apical dominance |
| 3. | Ethylene | – Bolting in beet |
| 4. | GA3 | – Thinning of cherry and walnut |
Removal of shoot tips is a very useful technique to boost the production of tea leaves. This is because:
| 1. | Gibberellins prevent bolting and are inactivated. |
| 2. | Auxins prevent leaf drop at early stages. |
| 3. | Effect of auxins is removed and the growth of lateral buds is enhanced. |
| 4. | Gibberellins delay the senescence of leaves. |
In order to increase the yield of sugarcane crops, which of the following plant growth regulators should be sprayed?
| 1. | Ethylene | 2. | Auxins |
| 3. | Gibberellins | 4. | Cytokinins |
It takes a very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?
1. Cytokinin and Abscisic acid
2. Auxin and Ethylene
3. Gibberellin and Cytokinin
4. Gibberellin and Abscisic acid
In which of the following options the PGR is correctly matched with its two functions?
1. Abscisc acid - (i) Induce immediate stomatal closure in leaves.
(ii) Induce rooting is a twig.
2. Gibberellins - (i) Bolting in rosette plant.
(ii) Speed up the malting process in brewing industry.
3. Ethylene - (i) Delay leaf senescence.
(ii) Controls xylem differentiation.
4. Auxin - (i) Used to kill mocotyledonous weeds.
(ii) Promotes nutrient mobilisation.
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