NEET BIOLOGY

Detailed explanation-1: -All living organisms are composed of structural and functional units called cells. The body of a living organism may be composed of a single cell or many cells. A cellis the smallest unit of life that can replicate independently.

Detailed explanation-2: -All living organisms are composed of cells, from just one (unicellular) to many trillions (multicellular). Cell biology is the study of cells, their physiology, structure, and life cycle.

Detailed explanation-3: -All living cells sense and respond to changes in external or internal conditions. Without that cognitive capacity, they could not obtain nutrition essential for growth, survive inevitable ecological changes, or correct accidents in the complex processes of reproduction.

Detailed explanation-4: -German scientists Theodore Schwann and Mattias Schleiden studied cells of animals and plants respectively. These scientists identified key differences between the two cell types and put forth the idea that cells were the fundamental units of both plants and animals.

Detailed explanation-5: -The cell wall is a non-living structure secreted by the plant cell itself for the protection of its plasma membrane and cytoplasm. It is made up of cellulose, a fibrous polysaccharide. The cell wall is a non-living structure made up of microfibrils.