Formative Practice 7.1 (Form 4 Biology Textbook Exercise and Answer)

Question 1:
Give five examples of the necessity of energy in a metabolic process.

Answer:
• Maintaining body temperature at the optimal temperature of 37 °C.

• Muscle contractions to enable movement.

• Cell division whereby new cells are produced for growth and development.

• Absorption of digested food through active transport.

• Synthesis of lipids, hormones, proteins and enzymes.

Question 2:
State the main substrate in the production of energy.

Answer:
Carbohydrate (glucose).

Question 3:
State the meaning of cellular respiration and the types of cellular respiration.

Answer:
Cellular respiration is the oxidation process of organic molecules through a few stages to release energy.
The main substrate for cellular respiration is glucose.
There are two types of cellular respiration:
aerobic respiration and anaerobic respiration.

Question 4:
Explain how humans, animals and plants acquire glucose to produce energy.

Answer:
In humans and animals, glucose is obtained through the breakdown of carbohydrates whereas in plants, glucose is produced through photosynthesis.