✓ 2 MARKS
Reasoning / Why
🔥 APPEARED IN 3 BOARD SETS
(a) (i) Name any two bases which are common to both DNA and RNA. (ii) Which vitamin deficiency causes : (1) Bone deformities in children ? (2) Pernicious anaemia ? OR (b) (i) Why do amino acids show amphoteric behaviour ? (ii) What happens when $\text{D-Glucose}$ is treated with hydroxylamine ?
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2023 | Series Other | Set 1 | Question 20 |
| CBSE 2023 | Series Other | Set 1 | Question 21 |
| CBSE 2023 | Series Other | Set 1 | Question 19 |
02 // OFFICIAL CBSE MARKING SCHEME BREAKDOWN
- Step 1: Stating the fundamental formula / law statement (+1 Mark)
- Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
- Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)