Which of the following is incorrect about Cyanobacteria?
- AThey have chlorophyll $a$ similar to green plants.
- BThey are photoautotrophs.
- CThey lack heterocysts.
- DThey often form blooms in polluted water bodies.
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Column-$I$ Column-$II$ $(A)$ Halophiles $(p)$ Gram-positive bacteria $(B)$ Firmicutes $(q)$ Hot springs habitat $(C)$ Methanogens $(r)$ Gram-negative bacteria $(D)$ Spirochetes $(s)$ Photosynthetic bacteria $(E)$ Thermoacidophiles $(t)$ Extremely salty areas $(u)$ Responsible for biogas production
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| $(A)$ Halophiles | $(p)$ Gram-positive bacteria |
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| $(C)$ Methanogens | $(r)$ Gram-negative bacteria |
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