The exponential growth in plants can be expressed as: W1 = W0ert where ‘e’ denotes:
1. Initial size at the beginning of the period
2. base of natural logarithms
3. growth rate/elongation per unit time
4. time of growth

Subtopic:  Growth Model |
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In plants, the living differentiated cells, have regain the capacity of division under certain conditions. This phenomenon is termed as:

 
1. Dedifferentiation 2. Proto-differentiation
3. Redifferentiation 4. Secondary differentiation
Subtopic:  Differentiation, Dedifferentiation and Redifferentiation |
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Consider the given two statements:

I: Removal of shoot tips is widely applied in hedge making and tea plantations.
II: Removal of shoot tips usually results in the growth of lateral buds.
 
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct


 

Subtopic:  Growth Hormones & Auxin |
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Consider the given two statements:
I: Spraying sugarcane crop with gibberellins increases the yield by as much as 20 tonnes per acre.
II: Sugarcane stores carbohydrates as sugar in their stems and spraying sugarcane crop with gibberellins increases the length of the stem.
 
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct

 
Subtopic:  Gibberellin |
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All the following statements regarding cytokinins are true except:
1. They were discovered as kinetin, a modified form of adenine.
2. Zeatin was isolated from corn-kernels and coconut milk.
3. Kinetin occurs widely in almost all plants.
4. Natural cytokinins are synthesized in region where rapid cell division occurs.
Subtopic:  Cytokinin |
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Which gaseous PGR is synthesised in large amounts by tissues undergoing senescence and ripening fruits
1. ABA 2. IAA
3. Ethylene 4. GA
Subtopic:  Ethylene |
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Which of the following is not a function of the PGR ethylene?
1. Vertical growth of seedlings
2. Swelling of axis of dicot seedlings
3. Apical hook formation in dicot seedlings
4. Fruit ripening

 
Subtopic:  Ethylene |
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Consider the given two statements:
I: The most widely used compound as source of ethylene is ethephon.
II: Ethephon in an aqueous solution is readily absorbed and transported within the plant and releases ethylene slowly.
 
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct

 
Subtopic:  Ethylene |
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Ethylene does not:
1. induce flowering in mango
2. hasten fruit ripening in tomatoes and apples
3. retard abscission of flowers and fruits in cotton cherry and walnut
4. promote female flowers in cucumbers
Subtopic:  Ethylene |
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In certain plants, flowering is either quantitatively or qualitatively dependent on exposure to low temperature. This phenomenon is termed:
1.  Pseudo-Dormancy
2.  Thermonasty
3.  Vernalisation
4.  Scarification
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