Summative Practice 10 (Question 3 & 4) – Form 4 Science (KSSM) Chapter 10

Question 3:
Photograph 2 shows fruits that are rich in antioxidants.

(a) What is meant by antioxidants?

(b) Explain the role of antioxidants in the human body.

(c) Give three types of antioxidants and their natural resources.

Antioxidants are chemical compounds that can be obtained from chemical synthesis or natural plants. When antioxidants react with free radicals, more stable compounds will be produced, stopping the oxidation process.

This substance protects body cells from free radical damage and is regarded as a defensive line against diseases.

• Beta carotene is an antioxidant substance which is commonly found in most red, yellow or orange coloured food such as apricots, carrots, pumpkins, mangoes, sweet potatoes and peaches.

• Lutein is an antioxidant substance which is commonly found in large quantities in green leafy vegetables such as spinach, cabbage and broccoli.

• Lycopene is an antioxidant substance which is commonly found in papaya, guava, watermelon, tomato, apricots, grapefruit and oranges.

• Vitamin C which is also known as ascorbic acid, is a water-soluble vitamin. Vitamin C is an antioxidant substance which is found in citrus fruits, spinach, broccoli, kiwi, strawberries, cranberry, cabbage and green pepper.

Question 4:
Figure 1 shows one of the complementary medical treatment methods.

Describe the massage method used in this medical method.

Massage is a method of manipulating soft tissues in the body using hands, fingers and fist. Massage soothes anxiety, pain, fatigue, muscle tension and nerve problems.

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