Question

Assertion (A): Eukaryotic cells have the ability to adopt a variety of shapes and carry out directed movement.
Reason (R): Microfilaments, microtubules and intermediate filaments, constitute the cytoskeleton.

• A. Both A and R are correct and R is the correct explanation of A.
• B. Both A and R are correct but R is not the correct explanation of A.
• C. A is correct but R is incorrect.
• D. A is incorrect but R is correct.

Hint:

The cytoskeleton is like the skeleton of the cell — it not only maintains shape but also drives movement and internal transport.

Answer 1

The Correct Option is A

The assertion is correct because eukaryotic cells can adopt a variety of shapes and perform directed movement, which is essential for many biological processes like tissue formation, immune responses, and wound healing. The reason is also correct — microfilaments, microtubules, and intermediate filaments together form the cytoskeleton. This network provides mechanical support, maintains cell shape, and enables motility by acting like a scaffold inside the cell. Moreover, R correctly explains A. The cytoskeleton is directly responsible for the shape variability and motility of eukaryotic cells. Microfilaments (actin filaments) are particularly important for cell movement and shape changes. Thus, both Assertion and Reason are true, and the Reason correctly explains the Assertion.

Answer 2

Explanation:

Assertion (A) states that eukaryotic cells can adopt various shapes and perform directed movement. This is true because eukaryotic cells have a dynamic internal framework called the cytoskeleton.

Reason (R) explains that the cytoskeleton is made up of microfilaments, microtubules, and intermediate filaments. This is also correct.

Microfilaments (actin filaments) help in changing cell shape and movement by assembling and disassembling rapidly.

Microtubules provide structural support, act as tracks for intracellular transport, and are involved in cell division and motility.

Intermediate filaments provide tensile strength and help maintain cell integrity.

Together, these cytoskeletal components enable eukaryotic cells to change shape and move purposefully, supporting the assertion.

Thus, both A and R are correct, and R correctly explains A.