The plant body not differentiated into root, shoot and stem is termed as

The correct answer is B. Thallus.

A thallus is a plant body that is not differentiated into root, shoot, and stem. It is a simple, flattened structure that is usually green and photosynthetic. Thallus plants are found in a variety of habitats, including aquatic environments, soil, and even on other plants.

Rhizome is a horizontal underground stem that grows horizontally and produces roots and shoots. It is a common feature of many plants, including grasses, irises, and ginger.

Lysosome is a small organelle found in cells that contains digestive enzymes. It is responsible for breaking down and recycling cellular components.

None of the above is a correct answer.