Consider the following:
1. Spirulina
2. Spirogyra
3. Chlorella
4. Funaria
Which of the following algae are rich in proteins and are used as food supplements by space travellers?
1
1 and 2 only
2
1 and 3 only
3
1 and 4 only
4
More than one of the above
5
None of the above