The Question is from neet-botany , and it was created by the author K SURESH KUMAR

Question

Certain seeds require a period of cold exposure before germination, a process known as stratification. This requirement primarily ensures:

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Seed Germination and Dormancy
 **Related Topics**: Plant Physiology, Hormonal regulation of plant growth, seed dormancy mechanisms
 **Prerequisites**: Basic understanding of seed structure, germination process, plant hormones (gibberellins), and inhibitors.
## SOLUTION PATHWAY
**Given Information**:
  The question describes stratification, a process where seeds require cold exposure before germination.
  We need to identify the primary reason for this cold requirement.
**Method & Steps**:
 1. Analyze the options and their relation to seed germination.
  Reasoning: Stratification breaks dormancy, allowing germination.  Let's examine how each option contributes.
 2. Evaluate each option's role in stratification:
  Option A: Increased seed coat permeability to oxygen is important for germination but not the primary reason for stratification. Cold treatment affects more than just oxygen permeability.
  Option B: Activation of enzymes is crucial, but it's a consequence, not the primary reason for stratification. Cold triggers enzyme activation.
  Option C: Leaching of germination inhibitors and promotion of gibberellin biosynthesis directly addresses dormancy breaking.  Cold temperatures often break down inhibitors and stimulate gibberellin production, which promotes germination.
  Option D: Vernalization (cold treatment) affects flowering, but this is not the primary effect on seed germination itself.  Stratification focuses on germination, not flowering.
 3. Conclude based on the primary effect of stratification:
  Result: The primary effect of stratification is the leaching of germination inhibitors and the promotion of gibberellin biosynthesis.  Gibberellins are plant hormones that play a crucial role in seed germination.
  Verification:  This aligns with the established understanding of how cold treatment affects seed germination.
 ## OPTION ANALYSIS
A :x:  Increased seed coat permeability to oxygen is a necessary condition for germination, but not the primary reason for cold stratification.
B :x: Enzyme activation is a result of stratification, not its primary purpose.
C ✓: Leaching of germination inhibitors and the increased production of gibberellins directly explain the effect of stratification on seed germination.
D :x: Vernalization is a separate process affecting flowering, not the primary function of stratification on seed germination.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing stratification with vernalization:  While both involve cold treatment, they have different targets (seed germination vs. flowering).
  2.Focusing on secondary effects:  Identifying oxygen permeability or enzyme activation as the primary reason instead of the hormonal and inhibitor changes.
 **Quick Tips**:
  1.Remember that gibberellins are key players in seed germination, and stratification promotes their production.
  2.Stratification breaks dormancy; cold treatment is the trigger for this process.

K SURESH KUMAR · Answer

Increased seed coat permeability to oxygen solely

K SURESH KUMAR · Answer

Activation of enzymes responsible for nutrient mobilization only

K SURESH KUMAR · Answer

The correct Option is "Leaching of germination inhibitors and promotion of gibberellin biosynthesis"

K SURESH KUMAR · Answer

Vernalization of the embryo and subsequent flowering

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