MCQ
Vessels and Companion cells are characteristics of
- ✓Angiosperm
- BGymnosperm
- CPteridophyta
- DFern
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No.of Centromere - No. of Kinetochore - No. of Arms

$(i)$ 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.