Question

The microorganisms which can live without oxygen are :

A. Bacteria

B. Amoeba

C. Paramecium

D. Blue-green algae

Answer 1

An anaerobic organism or anaerobe is any organism, which does not require oxygen for growth. It may react negatively or even die in the presence of oxygen.

Complete Answer:

- Any organism which can exist or live without oxygen is called an anaerobic organism or anaerobes. Anaerobic bacteria are also examples of anaerobic organisms, which do not require oxygen for respiration.

- Blue-green algae is also known as Cyanobacterium. They are a group of photosynthetic bacteria that need oxygen for survival.

- Blue-green algae are mostly blue-green in color and can also be reddish-purple or brown. They are generally grown in lakes, ponds, and slow-moving streams. The water in which they are grown should be warm and should be enriched with all the nutrients like phosphorus and nitrogen.

- If the environmental conditions are favorable, they can grow very quickly. Most of the species float on the surface of the water. When this process happens it is called blue-green algae bloom and it generally occurs in mid-June and late September.

- They were generally not eaten by other aquatic organs. And because of this reason, they were not an important part of the food chain. Most of the algae are microscopic and function as the main source of energy for larger organisms like zooplankton which are then eaten by small fish.

- Unfavorable conditions that are affected by blue-green algae are discolored water, reduced light penetration, taste, and odor problems. Blue-green algae blooms can be quite smelly. Blue-green algae affect the taste of drinking water.

- Blue-green algae toxins are naturally produced and produced inside the cells of certain species of blue-green algae. They can be killed by several chemicals including simazine, calcium and hypochlorites, and cupricide.

- Amoeba and Paramecium are both single-celled eukaryotes belonging to the Protista Kingdom. They are heterotrophs, which possess special feeding processes. In its single-celled body, the Amoeba cell comprises a membrane-bound nucleus, food vacuoles and contractile vacuoles. Amoeba cell division occurs by division of the cytoplasm . Amoeba allows the formation of pseudopodia to proceed slowly. A false foot is also called a pseudopodium.

Hence, the correct answer is option (A).

Note: Blue-green algae are used for weight loss and also as a nutritional supplement. It was also used for boosting the immune system.