$S -$ Statement: The nucleolus contains $DNA$.
$R -$ Reason: The nucleolus is a membrane-less spherical structure.
$R -$ Reason: The nucleolus is a membrane-less spherical structure.
- A$S$ and $R$ are both true,and $R$ is the correct explanation of $S$.
- B$S$ and $R$ are both true,but $R$ is not the correct explanation of $S$.
- C$S$ is true and $R$ is false.
- D$S$ is false and $R$ is true.
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The nucleolus is formed by . . . . . . .
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Match the chromosome types based on the position of the centromere as shown in the standard classification:
Column-$I$ (Type) Column-$II$ (Description) $1$. Metacentric $a$. Terminal centromere $2$. Sub-metacentric $b$. Sub-terminal centromere $3$. Acrocentric $c$. Middle centromere $4$. Telocentric $d$. Slightly away from the middle
| Column-$I$ (Type) | Column-$II$ (Description) |
|---|---|
| $1$. Metacentric | $a$. Terminal centromere |
| $2$. Sub-metacentric | $b$. Sub-terminal centromere |
| $3$. Acrocentric | $c$. Middle centromere |
| $4$. Telocentric | $d$. Slightly away from the middle |
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