MCQ
Humus is
- AA mixture of clay sand and loam
- BHeavy soil with mineral salts
- ✓Organic matter of colloidal size
- DLight soil with lime
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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.