Question:
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Grape seeds are stratified to break dormancy to get higher percentage of germination
Reason R: Seeds contain high level of GA and low level of phenols.
In light of the above statements, choose the correct answer from the options given below
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Grape seeds are stratified to break dormancy to get higher percentage of germination
Reason R: Seeds contain high level of GA and low level of phenols.
In light of the above statements, choose the correct answer from the options given below
Assertion A: Grape seeds are stratified to break dormancy to get higher percentage of germination
Reason R: Seeds contain high level of GA and low level of phenols.
In light of the above statements, choose the correct answer from the options given below
Show Hint
"Dormancy = High ABA Phenols + Low GA." Stratification reverses this balance, promoting the synthesis of GA and breaking down phenolic inhibitors to initiate germination.
Updated On: Aug 7, 2026
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
- A is true but R is false
- A is false but R is true
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Seed dormancy is a natural mechanism that prevents immediate germination of viable seeds under unfavorable conditions.
Stratification is a moist-cold treatment ($2 - 5^\circ\text{C}$) used to break physiological embryo dormancy.
Step 2: Detailed Explanation:
Let us analyze both statements:
Assertion A Analysis: Freshly harvested grape seeds (Vitis vinifera) exhibit physiological dormancy and require cold-moist stratification for $60 - 90\text{ days}$ to trigger germination.
This treatment significantly increases the germination percentage, making Assertion A true.
Reason R Analysis: Dormant grape seeds contain high levels of endogenous growth inhibitors, such as Abscisic Acid (ABA) and phenolic compounds, and very low levels of germination promoters like Gibberellins (GA).
Cold stratification works by gradually reducing ABA and phenolic levels while increasing GA synthesis, which activates hydrolytic enzymes to break down food reserves.
Therefore, dormant seeds contain low levels of GA and high levels of phenols, making the statement in Reason R false.
Step 3: Final Answer:
Since Assertion A is true but Reason R is false, the correct option is (C).
Seed dormancy is a natural mechanism that prevents immediate germination of viable seeds under unfavorable conditions.
Stratification is a moist-cold treatment ($2 - 5^\circ\text{C}$) used to break physiological embryo dormancy.
Step 2: Detailed Explanation:
Let us analyze both statements:
Assertion A Analysis: Freshly harvested grape seeds (Vitis vinifera) exhibit physiological dormancy and require cold-moist stratification for $60 - 90\text{ days}$ to trigger germination.
This treatment significantly increases the germination percentage, making Assertion A true.
Reason R Analysis: Dormant grape seeds contain high levels of endogenous growth inhibitors, such as Abscisic Acid (ABA) and phenolic compounds, and very low levels of germination promoters like Gibberellins (GA).
Cold stratification works by gradually reducing ABA and phenolic levels while increasing GA synthesis, which activates hydrolytic enzymes to break down food reserves.
Therefore, dormant seeds contain low levels of GA and high levels of phenols, making the statement in Reason R false.
Step 3: Final Answer:
Since Assertion A is true but Reason R is false, the correct option is (C).
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