MCQ
Chlamydomonas does not occur in:
- AFresh water
- BPond and lake
- CRiver
- DOcean
Explanation:
Chlamydomonas is a genus of unicellular, motile flagellates that occur in stagnant water, damp soil, in freshwater, seawater and in snow (snow algae).
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| Column $I$ | Column $II$ |
| $A .$ Hinge | $1.$ Atlas and axis |
| $B.$ Saddle | $2 .$ Frontal and parietal |
| $C .$ Pivot | $3 .$ Carpal and metacarpal of humans |
| $D .$ Ball and socket | $4 .$ Knee |
| $5 .$ Humerus and pectoral girdle |
Codes
$A \quad B \quad C \quad D$
$(i)$ 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.