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Section B: Explain the Respiratory Structures and Work Calculation

1. Explain how each of the following respiratory structures in humans is adapted to its function:
a. Nasal chamber
b. Diaphragm
c. Alveoli

2. Define work and calculate the work done:
a. Define work.
b. A stone of mass 500.0 g is raised to a height of 20.0 m above the ground. If the acceleration due to gravity is [tex]$10.0 \, \text{m/s}^2$[/tex], calculate the work done on the stone.

3. Poultry and Exotic Breeds:
a. Explain the term poultry as used in animal production.
b. Give three advantages of exotic breeds of birds over local breeds.

Section C: Gaseous Exchange in Plants and Electrical Appliance Calculation

4. Explain gaseous exchange in plants and plant excretion:
a. Explain how gaseous exchange in plants occurs during the night.
b. Describe briefly how plants excrete water.

5. Electrical Appliance Calculation:
a. An electrical appliance rated 1.5 kW, 240V is left running for 2 hours. Calculate the:
i. Current drawn.
ii. Electrical energy consumed.

6. Animal Breeds:
a. Explain the term animal breed.
b. Name three breeds of rabbit.

Sagot :

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Final answer:

Explanation of how nasal chamber, diaphragm, and alveoli are adapted to their respiratory functions.


Explanation:

Respiratory Structures Adapted to Function

(i) Nasal chamber: The nasal chamber is lined with mucous membranes and tiny hairs called cilia, which help filter and humidify air before it enters the respiratory system.

(ii) Diaphragm: The diaphragm is a dome-shaped muscle below the lungs that contracts and flattens during inhalation, increasing the chest cavity volume and allowing air to flow into the lungs.

(iii) Alveoli: Alveoli are tiny air sacs in the lungs where gas exchange occurs. Their structure, with a thin membrane and a rich blood supply, maximizes the diffusion of oxygen and carbon dioxide.


Learn more about Respiratory Structures Adaptation here:

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