IGCSE Biology Paper-2: Specimen Questions with Answers 147 - 148 of 203
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.
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?
Choices
Choice (4) | |
---|---|
a. | Diagram B |
b. | Diagram D |
c. | Diagram A |
d. | Diagram C |