Page 11 - Biology Form Two

Biology for Secondary Schools

3. Why are omnivores regarded as and health. They are important for
opportunistic feeders? promoting growth and development, as
well as regulating chemical processes
4. What is the role of enzymes in the in the body. Nutrients are obtained from
saprophytic mode of feeding?
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various foods such as cassava, meat,
5. Why are large trees in the forest bananas and vegetables.
not harmed by the epiphytes that There are five major types of nutrients,
grow on their bodies? which are carbohydrates, proteins, lipids

(fats and oil), vitamins, and minerals.
6. Explain the meaning of the
following: Water and roughage are also important.
(a) commensalism; Nutrients can be divided into two
(b) parasitism; and categories depending on the quantity
(c) mutualism. needed by the body. These groups are

7. How would you apply the concept macronutrients and micronutrients.
of nutrition to improve your diet? Macronutrients refer to nutrients that

8. What would happen to the are needed by the body in large amounts.
heterotrophs if there were no They include proteins, carbohydrates,
autotrophs? and lipids. These nutrients contain
9. Why is proper nutrition essential kilocalories (kcal) which can be burned
for maintaining health. in the body to produce energy needed

10. Why are human beings, pigs, and for various body functions. A calorie is
bears regarded as omnivorous a unit of measurement of food energy.
animals? Micronutrients are those needed by

the body in small amounts but are
Nutrients essential for carrying out body functions.
Task 1.2 They usually assist in many aspects

Search for information from the library of body functions such as producing
and internet sources on the concept of energy, digesting food substances, and

nutrients. Summarise important points making macromolecules. Examples of
from what you have searched. micronutrients are vitamins and minerals.

Nutrients are chemical components Unlike macronutrients, micronutrients
of foods, which are essential to life do not contain calories.

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