Which of the following are likely to be present in deep sea water?
- Blue-green algae
- Saprophytic fungi
- Archaebacteria
- Eubacteria
Answer
(3) Archaebacteria
Solution
As per NCERT, archaebacteria are special because they live in some of the most harsh habitats such as extreme salty areas (halophiles), hot springs (thermoacidophiles) and marshy areas (methanogens).
⇒ Deep sea water is dark, very cold and under very high pressure — an extreme habitat.
∵ Blue-green algae need light for photosynthesis and saprophytic fungi need decaying organic matter, they are not expected there.
∴ Archaebacteria, whose special cell wall structure helps them survive extreme conditions, are likely to be present.
Answer: (3)