EVERYDAY SCIENCE

Detailed explanation-1: -Answer and Explanation: The correct option is c, oval. The cell shape is the characteristics of the bacterial species and bacteria are grouped under four categories based on their cell shape; spherical (coccus), rod-shaped (bacillus), comma-shaped (vibrium) and spiral (helical or spirillum).

Detailed explanation-2: -Bacteria have distinct cell body shapes, ranging from spheres (cocci) to rods (bacilli) of various curvatures and helicities and to more exotic shapes, such as stars, formed by elaboration of prosthecae through polar growth.

Detailed explanation-3: -In bacteria, the cell wall forms a rigid structure of uniform thickness around the cell and is responsible for the characteristic shape of the cell (rod, coccus, or spiral). Inside the cell wall (or rigid peptidoglycan layer) is the plasma (cytoplasmic) membrane; this is usually closely apposed to the wall layer.

Detailed explanation-4: -Bacterial cells do not have an organized nucleus.