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

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Question 147

Question

MCQ▾

Food and air pathway are divided at

Choices

Choice (4)

a.

Stomach

b.

Oesophagus

c.

Pharynx

d.

Larynx

Answer

c.

Explanation

Pharynx

  • 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.
Due to Presence of Palate in Mammals

Question 148

Question

MCQ▾

The diagram shows a plant cell, which has lost water to its surroundings by osmosis.

Which part is the partially permeable membrane?

A Plant Cell

Choices

Choice (4)

a.

Diagram B

b.

Diagram D

c.

Diagram A

d.

Diagram C

Answer

d.

Explanation

Partially Permeable Membrane

Developed by: