Which of the following plant growth responses is primarily due to the action of auxins?
1. Cell elongation
2. Leaf abscission
3. Cell division
4. Fruit development
Subtopic: Â Auxin Function |
From NCERT
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If you were shipping green bananas to a supermarket thousands of miles away, which of the following chemicals would you want to eliminate from the plants environment?
1. CO2
2. Cytokinin
3. Auxin
4. Ethylene
1. CO2
2. Cytokinin
3. Auxin
4. Ethylene
Subtopic: Â Ethylene |
 89%
From NCERT
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Select the odd one out with respect to functions of gibberellin:
| 1. | They delay senescence, thus, due to their application the fruits can be left on the tree so as to extend the market period |
| 2. | GA3 is used to speed up the malting process in brewing industry |
| 3. | Spraying sugarcane crop with GA increases the length of stem, thus increasing the yield by as much as 20 tonnes per acre |
| 4. | Spraying juvenile conifers with GA slows down the maturity period thus leading to delayed seed production |
Subtopic: Â Gibberellin |
 84%
From NCERT
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Read the following statements:
Which of the above statements are correct?
1. (i), (ii) and (iii)
2. (ii) only
3. (iii) and (iv)
4. (i), (ii), (iv) and (v)
| (i) | GA causes increase in length of grape stalks and causes apples to elongate and improve its shape |
| (ii) | GA causes bolting in beet, cabbage and many plants with rosette habit |
| (iii) | Kinetin is a modified cytosine |
| (iv) | Cytokinins are abundant in root apices, developing shoot buds and young fruits |
| (v) | Cytokinins cause lateral shoot growth and adventitious shoot formation |
Which of the above statements are correct?
1. (i), (ii) and (iii)
2. (ii) only
3. (iii) and (iv)
4. (i), (ii), (iv) and (v)
Subtopic: Â Gibberellin |Â Cytokinin |
 88%
From NCERT
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Read the following statements with respect to ethylene -the gaseous plant hormone:
How many of the above statements are correct?
1. Four
2. Three
3. Two
4. Five
| (i) | Causes horizontal growth of seedlings. |
| (ii) | It is highly effective in causing fruit ripening. |
| (iii) | Is responsible for respiratory climatic in fruits which is the enhanced respiration rate during fruit ripening. |
| (iv) | Ethylene breaks seed and bud dormancy, initiates germination in peanut seeds, and causes the sprouting of potatoes. |
| (v) | It is used to initiate flowering and for synchronising fruit set in pineapples. |
How many of the above statements are correct?
1. Four
2. Three
3. Two
4. Five
Subtopic: Â Ethylene |
 75%
From NCERT
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Choose wrong statement:
| 1. | Ethylene induces flowering in mango tree |
| 2. | Ethylene promotes senescence of plant organs especially of leaves and flowers |
| 3. | Ethylene promotes rapid internode/petiole elongation in deep water rice plants |
| 4. | Ethylene is the least used PGR in agriculture and horticulture |
Subtopic: Â Ethylene |
 81%
From NCERT
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Ethephon:
| 1. | Hastens fruit ripening in tomatoes and apples, accelerates abscission in flowers and fruits |
| 2. | Promotes female flowers in cucumbers thereby increasing the yield |
| 3. | In aqueous solution is readily absorbed and transported within the plant and releases ethylene slowly |
| 4. | All of the above |
Subtopic: Â Ethylene |
 95%
From NCERT
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ABA :
| 1. | Inhibits seed germination |
| 2. | Stimulates stomatal opening |
| 3. | Decreases the tolerance of plants to various kinds of stresses |
| 4. | In most situation acts synergistically with GA |
Subtopic: Â Abscisic Acid |
 74%
From NCERT
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Read the following statements:
Which of the above statements are correct?
1. (i), (ii) and (v)
2. (iii) and (iv)
3. (iv) only
4. (iii), (iv) and (v)
| (i) | The role of PGR is of only one kind of intrinsic control |
| (ii) | Along with genomic control and extrinsic factors, they play an important role in plant growth and development |
| (iii) | Many of the intrinsic factors such as temperature and light, control the plant growth and development via PGR like vernalisation, flowering, dormancy , seed germination and plant movements |
| (iv) | Gibberellins promote senescence in plants |
| (v) | Both light and temperature has a role on initiation of flowering |
Which of the above statements are correct?
1. (i), (ii) and (v)
2. (iii) and (iv)
3. (iv) only
4. (iii), (iv) and (v)
Subtopic: Â Growth Hormones & Auxin |
 77%
From NCERT
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Seed packets give a recommended planting depth for the enclosed seeds. The most likely reason some seeds are to be covered with only \({ 1\over 4}\) inch of soil is that these :
1. Seeds do not have an etiolation response
2. Seeds of some kind require light to germinate
3. Seeds require a very high temperature to germinate
4. Do not produce hypocotyl
1. Seeds do not have an etiolation response
2. Seeds of some kind require light to germinate
3. Seeds require a very high temperature to germinate
4. Do not produce hypocotyl
 61%
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