An alga which can be employed as food for human being is :
- Polysiphonia
- Chlorella
- Ulothrix
- Spirogyra
Answer
(2) Chlorella
Solution
As per NCERT, certain unicellular algae like Chlorella are rich in proteins and are used as food supplements even by space travellers.
⇒ Chlorella is also a source of single cell protein (SCP).
∴ Chlorella can be employed as food for human beings.
Answer: (2)