IGCSE Biology Paper-1: Specimen Questions with Answers 14 - 16 of 208

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Question 14

Question

MCQ▾

The diagram shows four different animals, in which are Invertebrates?

Select Which of the Following Are Invertebrates

Choices

Choice (4)

a.

3

b.

1

c.

2

d.

4

Answer

c.

Explanation

Invertebrates are animals that don՚t have a backbone or spinal column and star fish is the example of invertebrates.

While reptiles, birds and coral snake are the examples of vertebrates.

Question 15

Question

MCQ▾

Gastric juice mainly contains?

Choices

Choice (4)

a.

Serum

b.

Hydrochloric acid and pepsin

c.

Pancreatic enzyme

d.

Bile

Answer

b.

Explanation

Hydrochloric acid and pepsin is present in the gastric juice. These help in breaking down complexes and aid in digestion.

Question 16

Question

MCQ▾

It shows nitrogen cycle. Which are missing process in the diagram? Find a and b.

Diagram of Nitrogen Cycle – Find a and B

Choices

Choice (4)

a.

a- Absorption b- nitrification

b.

a- Nitrogen fixation b- nitrification

c.

a-nitrite oxidation b- absorption

d.

a- Ammonium oxidation b- nitrogen fixation

Answer

b.

Explanation

Nitrogen Fixation-Living organisms do not use nitrogen gas in that form so it is necessary to convert into different compound. The process of converting atmospheric nitrogen into biologically available nitrogen is called nitrogen fixation.

Nitrification: Nitrification is the process that converts ammonia to nitrite. .

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