IGCSE Biology Paper-3: Specimen Questions with Answers 53 - 58 of 230

Question number: 53

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Explain how calcium affects human mouth. Also, write the name of food in which calcium can be found?

Explanation

Calcium is useful for tooth development, prevents loss of jawbone and teeth. It rebuild the hard surface of teeth. Calcium is found in milk, cheese. Yogurt and in dark green leafy vegetables.

Question number: 54

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New technologies are used to enhance the productivity of crops.

Name two chemical fertilizers, which are used, for yield of crops

Explanation

a. Anhydrous ammonia

b. urea

c. Superphosphate:

Passage

Figure shows a section of Flower.

 above picture shows female and male parts of a flower

Above Picture Shows Female and Male Parts of a Flower

Figure shows the different Female and male parts present in flower

Question number: 55 (1 of 3 Based on Passage) Show Passage

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Name parts A, B and C shown on female flower.

Explanation

A-stigma

B-style

C-ovary

Question number: 56 (2 of 3 Based on Passage) Show Passage

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Name parts X, Y and Z shown on female flower.

Explanation

X- anth

Y-filament

Z-tepal

Question number: 57 (3 of 3 Based on Passage) Show Passage

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While watching a new area of forest a student found an unknown plant seed. Hanging from it were some structures with it was lighter and smaller than other seeds. They have special structures such as wings or fluff.

Suggest, how these seeds might be dispersed?

Explanation

Seeds might be dispersed by wind because they are usually lighter and small than other seeds, which make them easy for the wind to carry them.

Question number: 58

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Write down some other characteristics of biotic factors?

 two characteristics of living organisms with their definition.

Two Characteristics of Living Organisms with Their Definition.

In given figure two features of biotic organism’s growth and reproduction are shown with their description

Explanation

1. Nutrition

2. Respiration

3. Digestion