Question 1

Which of the following tissues forms the lining of blood vessels and lung alveoli?

Accepted Answer

Simple squamous epithelium is composed of a single layer of flattened cells with irregular boundaries. They are found in the walls of blood vessels and air sacs of lungs and are involved in functions like forming a diffusion boundary.

Question 2

In which part of the human body would you find transitional epithelium?

Accepted Answer

Transitional epithelium (urothelium) lines the urinary bladder, ureters, and superior urethra, allowing these organs to stretch and accommodate varying volumes of urine without tearing.

Question 3

Which specialized junction helps to stop substances from leaking across a tissue?

Accepted Answer

Tight junctions help to stop substances from leaking across a tissue by forming a seal at the apical surfaces of adjacent epithelial cells.

Question 4

Which of the following is a loose connective tissue?

Accepted Answer

Areolar tissue is a type of loose connective tissue present beneath the skin. It serves as a support framework for epithelium and contains fibroblasts, macrophages, and mast cells.

Question 5

Which cells in areolar tissue secrete fibers and ground substance?

Accepted Answer

Fibroblasts are the primary cells in areolar and other connective tissues that secrete structural fibers (like collagen and elastin) and the ground substance matrix.

Structural Organisation in Animals — NCERT Class 11 Biology Important Questions & Revision Notes