NEET BIOLOGY

Detailed explanation-1: -Answer: The correct answer would be-lipids. Explanation: Many aquatic birds secrete a waxy organic substance which coats their feathers and this substance allows their feathers to repel the water which is helpful for their flying even after floating in the water.

Detailed explanation-2: -Cholesterol is a waxy, organic substance found in body cells and in blood. The human body uses cholesterol to make cell membranes, vitamin D, hormones, and bile (a liver product). There are two major types of cholesterol, both produced by the liver.

Detailed explanation-3: -Many aquatic birds secrete waxy organic substances that repel water. The birds use these substances to coat their feathers.

Detailed explanation-4: -Cutin and suberin are complex biopolyesters composed of fatty acids and aromatic compounds. Cutin is the major component of the cuticle, the waxy, water-repelling surface layer of cell walls exposed to the environment aboveground.

Detailed explanation-5: -Lipids. Lipids are organic compounds that contain mainly carbon, hydrogen, and oxygen. They include substances such as fats and oils. Lipid molecules consist of fatty acids, with or without additional molecules.