CIE Biology Paper-2: Specimen Questions 37 - 40 of 103

Question number: 37

MCQ▾

Question

The conversion of ammonia to nitrate is known as-

Choices

Choice (4) Response
a.

Nitrogen fixation

b.

Nitrification

c.

Ammonification

d.

Denitrification

Answer

b.

Explanation

The conversion of ammonia into nitrate is called nitrification. Nitrification process occur in the presence of soil-living bacteria and other nitrifying bacteria. In the primary stage of nitrification, bacteria such as the Nitrosomonas species, which converts ammonia to nitrites, perform the oxidation of ammonium.

Question number: 38

MCQ▾

Question

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

Choices

Choice (4) Response
a.

Dominance

b.

Crossing over

c.

Linkage

d.

Amitosis

Answer

c.

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 number: 39

MCQ▾

Question

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

Image shows a base pair TGG

Image shows a base pair TGG

The diagram shows a type of mutation, Name the type of mutation

Choices

Choice (4) Response
a.

Frame shift

b.

Insertion

c.

Deletion

d.

Substitution

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 number: 40

MCQ▾

Question

What do you mean by deforestation?

Choices

Choice (4) Response
a.

establishment of a forest

b.

permanent destruction of forests

c.

stand of trees in an area

d.

Growth of trees

Answer

b.

Explanation

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

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