NEETZoologyStructural Organisation in Animals
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Goblet cells of the alimentary canal are classified as unicellular glands. Reason (R): They are formed by the modification of simple squamous epithelial cells to secrete mucus. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- A(A) is true but (R) is false.
- BBoth (A) and (R) are true and (R) is the correct explanation of (A).
- CBoth (A) and (R) are true but (R) is not the correct explanation of (A).
- D(A) is false but (R) is true.
Correct answer
A. (A) is true but (R) is false.
Step-by-step solution
Assertion (A) is true because goblet cells of the alimentary canal consist of isolated glandular cells, which makes them unicellular glands. Reason (R) is false because glandular epithelium is formed by the modification of columnar or cuboidal epithelial cells, not squamous epithelial cells. Squamous epithelium is typically involved in functions like forming diffusion boundaries, whereas columnar and cuboidal cells get specialised for secretion. Therefore, (A) is true but (R) is false. Answer: (A) is true but (R) i