IGCSE Biology Paper-2: Specimen Questions with Answers 147 - 148 of 203

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Question 147

MCQ▾

Food and air pathway are divided at

Due to presence of palate in mammals, anterior part of pharynx is divide in two chambers.
- On Dorsal surface nasopharynx
- On ventral surface oropharynx
Posteriorly both these chambers open in pharynx, so pharynx is a common chamber for food and air Therefore, mammals can breathe through mouth.
In posterior part of pharynx 2 openings are present:
- Upper opening is called Gullet through which pharynx open in oesophagus.
- Lower opening is called Glottis through which pharynx open in Larynx/Trachea.
On glottis leaf, shape septum Epiglottis (thin elastic cartilage) is present which close glottis at the time of swallowing. So at this moment breathing stops or breathing rate become zero.
Pharynx is only body part in which both food and air passage intersect each other.