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Biology · 2025 · 3 marks
CBSE 2025 · Region 1 · Set 2 · Q28
Study the diagram given below and answer the questions that follows: (a) Identify the structure shown in the above figure. (b) Identify the labels P…
Study the diagram given below and answer the questions that follows :
(a)
Identify the structure shown in the above figure.
(b)
Identify the labels P and Q.
(c)
Write the nature of histone proteins.
(d)
Distinguish between Euchromatin and Heterochromatin.
Marking-scheme solution
(a)
Nucleosome
(b)
$\displaystyle \mathrm{P}=\mathrm{DNA} \quad \mathrm{Q}=$ Histone octamer
(c)
Basic/ Positively charged
(d)
| Euchromatin | Heterochromatin |
| 1. Loosely packed chromatin | 1. Densely packed |
| 2. Lightly stained | 2. Darkly stained |
| 3. Transcriptionally active chromatin | 3. Transcriptionally inactive chromatin |
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.