### Step-by-Step Deconstruction:
- **Step 1:** Read Sub-part (a), (b), and (c) first before reading the case paragraph.
- **Step 2:** Note which parts carry internal choice (usually part c has an 'OR' option). Decide which choice you can solve with 100% precision.
- **Step 3:** Identify the core NCERT chapter behind the case (e.g. Mendel's monohybrid cross or domestic electric circuits).
- **Step 4:** Answer concisely: 1-mark questions require 1 to 2 lines; 2-mark questions require formula + substitution + boxed answer.
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