MCQ
An important function of endoplasmic reticulum is:
- ✓Protein synthesis
- BNutrition of the nucleus
- CSecretion of substances
- DGiving shape to the cell
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$(i)$ Methanogens are archaebacteria which produce methane in marshy areas.
$(ii)$ Nostoc is a filamentous bluegreen alga which fixes atmospheric nitrogen.
$(iii)$ Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
$(iv)$ Mycoplasma lack a cell wall and can survive without oxygen.The correct statements are
| 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
$A \quad B \quad C \quad D$