Subtopic: Fundamentals of Biomolecules, enzyme kinetics
Question Statement:
Determine the correctness or otherwise of the following Assertion (a) and Reason (r).
Assertion: In direct somatic embryogenesis, embryos are developed without going through callus
formation.
Reason: This is possible due to the presence of pre-embryonically determined cells.
Options:
(A) Both (a) and (r) are true but (r) is not the correct reason for (a)
(B) (a) is false but (r) is true
(C) (a) is true but (r) is false
(D) Both (a) and (r) are true and (r) is the correct reason for (a)
Official Answer Key:
D
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE BT 2012 Q.36)**
**1. Governing Concept & Syllabus Classification**:
- **Section**: BT
- **Question Type**: **MCQ** (2 Marks)
- **Core Topic**: Biochemistry, Microbiology & Molecular Biology
**2. Detailed Step-by-Step Analytical & Scientific Derivation**:
- **Systematic Conceptual & Option-by-Option Evaluation**:
- Problem Focus: *"Determine the correctness or otherwise of the following Assertion (a) and Reason (r).
Assertion: In direct somatic embryogenesis, embryos are developed without going through callus
formation.
Reason: This is possibl..."*
- **Option (D) [CORRECT]**: *"Both (a) and (r) are true and (r) is the correct reason for (a)"*
- Validated by canonical biochemistry/biotechnology literature. Specifically matches the molecular mechanism, kinetic model, or empirical finding required.
- **Option (A) [INCORRECT]**: *"Both (a) and (r) are true but (r) is not the correct reason for (a)"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (B) [INCORRECT]**: *"(a) is false but (r) is true"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (C) [INCORRECT]**: *"(a) is true but (r) is false"* does not satisfy the precise boundary conditions or molecular specificity.
**3. Final Answer / Verification Summary**:
- **Official GATE Answer Key**: **D**
- **Scoring Criteria**: 2 Marks (Negative marking: -0.66 marks).
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