Which of the following plants is able to show rolling of leaf during the middle of the day?

Statement-$I$: The anatomical setup of the lungs in the thorax is such that any change in the volume of the thoracic cavity will be reflected in the lung cavity.
Statement-$II$: The volume of air remaining in the lungs even after a forcible expiration is called residual volume.

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

The maximum amount of water vapour that the atmosphere can hold at a given temperature is known as:

What is the approximate amount of $CO_2$ eliminated by our lungs per day?

Assertion: In mammals,a complex respiratory system has developed.
Reason: Mammalian skin is impermeable to gases.