Question

Which of the following are likely to be present in deep sea water ?

• A. Archaebacteria
• B. Eubacteria
• C. Blue-green algae
• D. Saprophytic fungi

Answer 1

The Correct Option is A

To determine which organisms are likely to be present in deep sea water, we need to consider the characteristics and environmental adaptations of each option provided:

1. Archaebacteria: These are a group of microorganisms that are similar to, but evolutionarily distinct from, bacteria. Archaebacteria are known for their ability to survive in extreme environments, such as hydrothermal vents on the ocean floor, where conditions are very harsh (high temperature, high pressure, and low oxygen levels). Due to their extremophilic nature, archaebacteria are likely to be present in deep sea water.
2. Eubacteria: These are the "true bacteria" and are found in a variety of environments, including soil, water, and inside other organisms. While eubacteria can be found in ocean waters, they are not typically associated with the extreme conditions of deep sea environments.
3. Blue-green algae (Cyanobacteria): These are photosynthetic bacteria commonly found in aquatic environments. However, they require sunlight for photosynthesis, which is not available in the deep sea. Therefore, they are unlikely to thrive in deep sea water.
4. Saprophytic fungi: These fungi obtain nutrients by decomposing organic matter. While some fungi can survive in deep sea environments, they are more commonly found in terrestrial or shallow aquatic settings where decomposing organic material is more abundant than in the deep sea.

Therefore, the organism most likely to be present in deep sea water is Archaebacteria due to their unique adaptations to extreme environments.