MCQ
Which era is called the age of angiosperms?
- ✓Cenozoic era
- BMesozoic era
- CProterozoic era
- DPalaeozoic era
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$R$ : All the three phyla include members with bilateral symmetry and true coelom.
| Column $I$ | Column $II$ |
| ($a$) Pneumotaxic Centre | ($i$) Alveoli |
| ($b$) $O _{2}$ Dissociation curve | ($ii$) Pons region of brain |
| ($c$) Carbonic Anhydrase | ($iii$ Haemoglobin |
| ($d$) Primary site of exchange of gases | ($iv$) $R.B.C.$ |