MCQ
The enzyme that catalyses initial carbon dioxide fixation in $C_4$ plants is:
- A$\text{RuBP}$ carboxylase.
- ✓$\text{PEP}$ carboxylase.
- CCarbonic anhydrase.
- DCarboxydismutase.
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$I.$ Maxillae $II.$ Malleus
$III.$ Incus $IV.$ Stapes
$V.$ Vomer
| $a.$ | Pineal | $i.$ | Epinephrine |
| $b.$ | Thyroid | $ii.$ | Melatonin |
| $c.$ | Ovary | $iii.$ | Estrogen |
| $d.$ | Adrenal medulla | $iv.$ | Tetraiodothyronine |
$I.$ $PCT$ $II.$ $DCT$
$III.$ Loop of Henle $IV.$ Collecting duct
Which contributes most in maintaining $pH$ of blood?