Given below are two statements :

Statement 1 : Only oesophagus open into pharynx.

Statement 2 : Only wind pipe open into pharynx.

In the light of the above statements choose the most appropriate answer from the options given below.

Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

Select the correct events that occur during inspiration.

(a) Contraction of diaphragm
(b) Contraction of external intercostal muscles
(c) Pulmonary volume decreases
(d) Intrapulmonary pressure increases