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Oxygenic photosynthesis occurs in:

Option: 1

Oscillatoria


Option: 2

Rhodospirillum


Option: 3

Chlorobium


Option: 4

Chromatium


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Oscillatoria is a photosynthetic cyanobacterium. In this, during photosynthesis water is electron donor and oxygen is a by -product, ie oxygenic photosynthesis occurs. Rhodospirillum and Chlorobium are non- oxygenic photosynthetic, purple non- sulphur and green sulphur bacteria. chromatium is a purple sulphur bacterium, also a non- oxygenic photosynthetic.

The cell junctions called tight, adhering and gap junctions are found in epithelial tissue. Epithelial tissue covers the whole surface of the body. It is made up of cells closely packed and ranged in one or more layers. This tissue is specialised to form the covering or lining of all internal and external body surfaces. Epithelial tissue that occurs on surfaces of the interior of the body is known as endothelium

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