MCQ
Blood of Pheretima is:
- ABlue with haemocyanin in corpuscles.
- BBlue with haemocyanin in plasma.
- CRed with haemoglobin in corpuscles.
- ✓Red with haemoglobin in plasma.
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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.