MCQ
Vessels differ from tracheids.
- AIn being living.
- BIn being derived from a single cell.
- CIn that they consist of vertical row of cells with cross walls dissolved.
- DIn coducting water and minerals.
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| Types of cells (Langerhans) | Hormones |
| $\alpha$ - cells secrete | $A$ |
| $\beta-$ cells secrete | $B$ |
| $\delta$ - cells secrete | $C$ |
$I.$ Diffusion membrane is made up of $3$ layers
$II.$ Solubility of $CO _{2}$ in blood is higher than $O _{2}$ by $25$ times
$III.$ Breathing volumes are estimated by spirometer
$IV.$ High $H ^{+}$ in blood favours oxygen dissociation
Choose the correct option