Chapter 5 Nutrition - Tutorial Answers)

Jurongville Secondary School Secondary 3 Express Biology Tutorial Syllabus 5100 Name: Marking Scheme (

)

Class: Sec 3 Express Chapter 4: 1.

Date: ____________

Nutrition

The following substances are found in living organisms: V: Fats

W: Carbohydrates

X: Proteins

a. Which are organic compounds?

Y: Water

Z: Minerals

V, W, X

b. Which of the organic substances contain only carbon, hydrogen and oxygen? V, W c. Which possesses hydrogen and oxygen in the ratio 2:1?

W

d. Which of the organic substances contains nitrogen?

X

e. Which substance forms the major part of living cells?

Y

f.

Which substance is needed in small amounts by living organisms? Z

g. Name the food substance not mentioned in V to Z above. Vitamins

2.

3.

h. Is the food substance in (g) organic or inorganic?

Organic

Match (a) to (f) with one of the terms:

Fats

Carbohydrates

Proteins

a. Made up of amino acids

Proteins

b. Give a violet colour with Biuret reagents

Proteins

c. Acts as a solvent for certain vitamins

Fats

d. Cellulose and glycogen belong to this group

Carbohydrates

e. Abundant in tapioca

Carbohydrates

f.

Fats

Has the highest energy value

The following are food items in our diet.

V: Papaya

W: Fish

X: Rice

Y: Margarine

Z: French fries

a. Which of the above items is best for a person who is suffering from constipation? V b. Eating too much of these items can lead to obesity. X, Y, Z c. Which item is a rich source of (i) proteins, (ii) vitamin C? (i) W (ii) V d. Which are (i) energy-rich (ii) body-building food?

1

(i) XYZ (ii) W

e. Eating which food item will prevent scurvy?

2

V