MCQ
Those animals which excrete a large amount of $N{H_3}$are
- ATerrestrial
- BEgg laying
- CAmphibious
- ✓Aquatic
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| Column $I$ | Column $II$ |
| $(a)$ Tarsal | $(i) \;14$ |
| $(b)$ Phalanges | $(ii)\; 1$ |
| $(c)$ Meta tarsal | $(iii) \;7$ |
| $(d)$ Femur | $(iv) \;5$ |
$I.$ It does not help in water conduction.
$II.$ It is also called alburnum.
$III.$ It is dark in colour but very soft.
$IV.$ It has tracheary elements, which are filled with tannin, resin, etc.