Question

Read the assertion and reason carefully to mark the correct option in question.

Assertion: Sub-metacentric chromosome has one shorter and one longer arm.

Reason: Metacentric chromosome has one very long and one very short arm.

Answer 1

Assertion

Sub-metacentric chromosome has one shorter and one longer arm.

Elaboration

The centromere divides the arm of the chromosome into two ($p$ and $q$ arms). Based on the position of the centromere or primary constriction, chromosomes can be classified into four types- metacentric, sub-metacentric, acrocentric and telocentric. In sub-metacentric chromosome, the $p$ arm is shorter than the $q$ arm. Thus the given assertion is true.

Reason

Metacentric chromosome has one very long and one very short arm.

Elaboration

When the centromere is present in the center of the chromosome, it results in the formation of two equal arms. This type of chromosome is called metacentric chromosome. Thus the given reason is false.

Final answer

(C) If assertion is true but reason is false.