MCQ
Which ecosystem has the highest gross primary productivity
- ✓Rainforests
- BTundra
- CMangroves
- DGrass lands

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$(i)$ Mesosome is formed by the extensions of plasma membrane into the cell.
$(ii)$ The pili are elongated tubular structures made up of a protein.
$(iii)$ Flagellum is composed of filament, hook and basal body.
$(iv)$ Ribosomes are about $30\; nm$ by $50\; nm$ in size.
$I.$ Ethidium bromide
$II.$ Restriction endonuclease
$III.$ Agarose
$IV.$ $UV$ radiation
Choose the correct option: