IGCSE Biology Paper-3: Specimen Questions with Answers 169 - 172 of 358

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Question 169

Question

MCQ▾

The diagram shows a half-flower. Define X?

The Figure Shown Half Flower

Choices

Choice (4)

a.

Pistil

b.

Stamen

c.

Petal

d.

ovary

Answer

c.

Explanation

Petals are changed leaves with brighter color that frame the reproductive parts of flowers.

Question 170

Question

MCQ▾

This diagram shows.

The Diagram Shows the Process of Ozon Depletion

Choices

Choice (4)

a.

Acid rain

b.

Pollution

c.

Greenhouse effect

d.

Destruction of ozone

Answer

d.

Explanation

ozone is a layer present in stratosphere and protect from UV rays. In give diagram destruction of ozone is shown due to chloroflourocarbon.

Question 171

Question

MCQ▾

This is the diagram of forest fire. It is the example of

The Figure Shown Forest Fire

Choices

Choice (4)

a.

Gaseous pollutants

b.

Soil pollution

c.

Marine pollution

d.

Water pollutants

Answer

a.

Explanation

There are some natural resources of gaseous pollution like forest fire, volcanic eruption, pollen grains, dust particles etc.

Passage

Figure shows the teeth of an adult human.

Image Shows the Inner Part of Adult Human

Question 172 (1 of 5 Based on Passage)

Edit

Write in Short

Short Answer▾

Tooth decay is caused into the dentine. Explain the factors that can enhance risk of tooth decay

Explanation

a-Eating food and drink high in carbohydrates, particularly snacking regularly between meals, will increase risk of tooth decay.

b-If do not regularly brush teeth and clean between them with floss or an interdental brush, will higher risk of tooth decay.

People who smoke and drink alcohol regularly are at an increased risk of tooth decay.

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