Question

1.3 indicate whether each of the statements in column i applies to a only, b only, both a and b or none of the items in column ii. write a only, b only, both a and b or none next to the question number (1.3.1 to 1.3.5) in the answer book.
column i
1.3.1 doubling of the population size at different intervals
1.3.2 a gland that functions as both exocrine and endocrine
1.3.3 hormone(s) responsible for osmoregulation
1.3.4 the phenomenon that allows two species to share the same niche
column ii
a geometric growth
b natality
a liver
b pancreas
a aldosterone
b antidiuretic hormone
a competitive exclusion principle
b resource partitioning (4x2) (8)
1.4 the model of the lungs below is used to demonstrate the mechanism of breathing
1.4.1 what structures in the respiratory system does label a and c representing?
1.4.2 give a visible reason why diagram 2 represents inhalation.
1.4.3 give two reasons why the model does not truly represent the human gaseous exchange system.
total se

Explanation:

1.4.1: In the respiratory system, label A likely represents the trachea (wind - pipe) and label C likely represents the lungs.
1.4.2: In diagram 2, the rubber sheet at the bottom (representing the diaphragm) is pulled down, increasing the volume inside the 'chest cavity' and causing air to rush in, which is a visible sign of inhalation.
1.4.3: One reason is that the model does not have the complex network of bronchioles and alveoli present in the human lungs for efficient gas exchange. Another reason is that the model does not account for the rib - cage movement and the role of intercostal muscles in the real breathing process.

Answer:

1.4.1: A - Trachea, C - Lungs
1.4.2: The rubber sheet at the bottom is pulled down, increasing volume and causing air to rush in.
1.4.3: Lack of bronchioles and alveoli; No representation of rib - cage and intercostal muscle movement.