Which of the following conclusions is supported by the research of both Went and Charles Darwin on shoot responses to light?
1.
When shoots are exposed to light, a chemical substance migrates towards the light.
2.
Agar contains a chemical substance that mimics a plant hormone.
3.
A chemical substance involved in shoot bending is produced in the shoot tips.
4.
Once the shoot tip is cut, normal growth cannot be induced.
Subtopic: Â Growth Hormones & Auxin |
 66%
From NCERT
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Match the columns:
| Column-I | Column-II | ||
| A. | Auxin | (i) | Chloroplast development |
| B. | Ethylene | (ii) | Fruit ripening |
| C. | GA | (iii) | Root initiation in stem cutting |
| D. | Cytokinin | (iv) | Breaking seed dormancy |
| 1. | A = (i) , B=(iv), C =(iii) , D= (ii) |
| 2. | A = (ii) , B=(iii), C =(i) , D= (iv) |
| 3. | A = (iii) , B=(ii), C =(iv) , D= (i) |
| 4. | A = (i) , B=(ii), C =(iii) , D= (iv) |
Subtopic: Â Growth Hormones & Auxin |Â Gibberellin |Â Cytokinin |Â Ethylene |
 89%
From NCERT
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Read the following statements:
How many of the above statements are correct?
1. Four
2. Five
3. Two
4. Three
| (i) | NAA and 2,4-D are synthetic auxins |
| (ii) | Auxins promote flowering in pineapples |
| (iii) | Auxins help to prevent fruit and leaf drop at early stages but promote the abscission of older mature leaves and fruits |
| (iv) | Apical bud removal is applied for hedge making and creating bushy tea plants |
| (v) | Auxin induces parthenocarpy, like, in tomatoes |
How many of the above statements are correct?
1. Four
2. Five
3. Two
4. Three
Subtopic: Â Growth Hormones & Auxin |
 83%
From NCERT
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NEET 2025 - Target Batch
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NEET 2025 - Target Batch
The aleurone layer is stimulated to release ______________ and ______________ as a result of gibberellin release from the embryo of a seed:
1. Amylase; Protease
2. RNase; DNase
3. Proteins; Amino acids
4. Carbohydrates ; RNase
1. Amylase; Protease
2. RNase; DNase
3. Proteins; Amino acids
4. Carbohydrates ; RNase
Subtopic: Â Gibberellin |
 66%
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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
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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NEET 2025 - Target Batch
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NEET 2025 - Target Batch
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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