| (i) The commercial product, Agar, obtained from Gracilaria and Gelidium, as in ice cream and jelly preparation as well as used to grow microbes. |
| (ii) Spirogyra and Chlorella are used in sewage disposal ponds. |
| (iii) Some species of marine algae like Porphyra, Laminaria and Sargassum are used as food. |
A) (ii) and (iii)
B) (i) and (ii)
C) (i) and (iii)
D) (i), (ii) and (iii)
Correct Answer: D
Solution :
[d] Agar is obtained from Gracilaria, Gelidium, Ceramium, Chondrus, etc. It is used in microbiological science to solidify culture media. Green unicellular algae such as Chlorella and Chlamydomonas are used in sewage disposal ponds. They restore\[{{O}_{2}}\]and remove\[C{{O}_{2}}\]by the process of photosynthesis and make sewage water habitable for many fishes and aerobic bacteria whereas, Porphyra, Laminaria and Sargassum, are used as food.
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