In most of the thin-leaf mesophytes,the leaf stomata open during the day and close during the night. This pattern is known as:

Match the following columns and select the correct option:

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	$(iv)$ $R.B.C.$

Which of the following statements are not correct?
$I.$ 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

Which physiological adaptation occurs in people living at high altitudes to survive in low atmospheric pressure?

Which of the following plants possesses sunken stomata?

Thermo-regulation in dogs takes place by