IGCSE Biology Paper-2: Specimen Questions with Answers 38 - 41 of 203

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Question 38

Question

MCQ▾

Mendel found certain traits not separating independently . The main reason behind it is-

Choices

Choice (4)

a.

Amitosis

b.

Dominance

c.

Crossing over

d.

Linkage

Answer

d.

Explanation

Genetic linkage is the tendency of alleles that are present close together on a chromosome to be inherited together during the meiosis phase of reproduction.

Question 39

Question

MCQ▾

The diagram shows a type of mutation. Which type of mutation is this?

Image Shows a Base Pair TGG

Choices

Choice (4)

a.

Substitution

b.

Insertion

c.

Deletion

d.

Frame shift

Answer

b.

Explanation

Insertions are mutations in which extra base pairs are place into a new place in the DNA. In given diagram TGG place into a new place in the DNA.

Question 40

Question

MCQ▾

What do you mean by deforestation?

Choices

Choice (4)

a.

establishment of a forest

b.

stand of trees in an area

c.

Growth of trees

d.

permanent destruction of forests

Answer

d.

Explanation

Deforestation refers to the cutting, clearing, and removal of trees due to logging, mining, oil extraction etc.

Question 41

Question

MCQ▾

Possible effects of deforestation can be.

Choices

Choice (4)

a.

Soil erosion-Yes, Flooding-Yes

b.

Earthquake Yes, Volcanic eruption-Yes

c.

Soil erosion-No, Flooding-No

d.

Soil erosion-No, decrease in atmospheric carbon di oxide-yes

Answer

a.

Explanation

Deforestation is related to cutting or removal of forests. In addition, soil erosion and flood both can occur due to deforestation.

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