Which of the following is not a unicellular organism?

Which of the following is not a unicellular organism? Correct Answer Hydra

Concept:

• On the basis of the number of cells, organisms can be divided into two types 1. Unicellular Organisms 2. Multicellular organisms

1. Unicellular organisms are made up of a single cell only. Ex- Amoeba, Paramecium, Euglena, Yeast, etc.
2. Multicellular organisms are made up of many cells. Ex- Hydra, animals, plants, etc.

• Multicellular organisms exhibit different levels of body organization like cellular, tissue. organ & organ system level of body organisation

Explanation:

• Hydra belongs to the phylum Coelenterata. It is a multicellular organism that exhibits tissue level of body organization.
• Here the cells performing the same function are arranged into tissues
• Hydra shows the polyp body form i.e. it is sessile and cylindrical

Important Points

Other important characters of Hydra are:

1. Hydra reproduces by asexual and sexual methods. Asexual reproduction takes place either by budding or by fission.
2. Digestion in hydra is extracellular i.e. it catches the prey by its tentacles and pushes it to the oral groove into the gastrovascular cavity then releases digestive enzymes to degrade the food into smaller absorbable forms
3. Hydra does not have a circulatory system. The water they live in provides food and oxygen to their bodies.