| A. Fresh water habitats |
| B. Produce auxospores |
| C. lias pigment Astaxanthin |
| D. Indicate sewage pollution |
| E. Have ridge or frustule |
| F. Chl. a, b and carotenoids are photosynthetic pigment |
A) B, C, D are correct
B) C, D, E are correct
C) A, D, E are correct
D) A, C, F are correct
Correct Answer: D
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