Question

ASSERTION: Cell wall is present in plant.
REASON: Animal cells lack cell walls.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B. Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
C. Assertion is correct but Reason is incorrect.
D. Both Assertion and Reason is incorrect.

Answer 1

Hint: Cell wall is an important feature of plant cells. It is present in the plant cells, bacteria, algae, fungi, and some archaea. It is responsible for the structure and rigidity of the plant cell.

Complete Answer:
- Cell wall is one of the most important features which distinguish plant and animal cells. It is the outermost covering of the plant cell which surrounds the cell membrane whereas in animal cells the outermost layer is the cell membrane.
- The plant cells need cell membrane because they need a rigid structure so that they can grow out and out. It provides mechanical support and tensile strength to the plant.
- Animal cells do not require rigid structure thus the cell wall is absent in animals. The endoskeleton helps in maintaining the structure and shape of the animal cell.
- The plasma membrane helps in protecting the internal structure of cells.

The correct answer is (B).

Note: Another distinguishing feature of plant cells is presence of chloroplast. They contain photosynthetic pigment called chlorophyll which is responsible for trapping the sunlight and converting it into food.