NEET BIOLOGY

Detailed explanation-1: -In unicellular organisms, cell division is the means of reproduction; in multicellular organisms, it is the means of tissue growth and maintenance.

Detailed explanation-2: -Unicellular organisms are organisms consisting of one cell only that performs all vital functions including metabolism, excretion, and reproduction.

Detailed explanation-3: -Both unicellular and multicellular organisms undergo mitosis.

Detailed explanation-4: -Unicellular organisms (like bacteria, yeast and archaea) typically grow using a method called binary fission. Here each single cell (mother cell) expands, replicates its genetic material, and divides into two cells (daughter cells). In this way, each time a new generation is produced the population doubles (Fig.