Question

The factor which influences unicellular organisms to keep spherical shape is
A. Surface tension
B. Osmosis
C. Viscosity
D. Protoplasm

Answer 1

Hint: an inward is acting on a semi-solid or fluid which helps in maintaining the proper shape and structure of that fluid or semi-solid.

Complete answer: 1. The unicellular organisms have cytoplasm, nucleus, and membrane-bound cell organelle all are bounded in a bilayer known as a phospholipid bilayer.
2. They are mostly spherical in shape and sustain their shape during their whole life span.
3. Surface tension: Surface tension is defined as the force applied towards the centre of the cell by the cell membrane to maintain the proper shape of the cell. As this surface tension force is acting equally from all directions so an equal amount of force is acting on the centre of the cell. So here surface tension is responsible for the spherical shape of the unicellular organisms also these organisms do not have a cytoskeleton to maintain the shape of the cell. Hence tension is the only method to maintain the shape of the cell.

So, the correct answer is “Option A”.

Note: 1. Osmosis is the process of the diffusion of solvent from its high concentration to its low concentration through a semipermeable membrane this is known as osmosis, it helps in maintaining osmotic pressure inside the cell according to the atmospheric conditions.
2. Cytoplasm is also known as protoplasm, it is a semi-solid fluid-like substance inside the cell
3. Viscosity does not support the cell in maintaining the shape of the cell.