IGCSE Biology Paper-1: Specimen Questions with Answers 24 - 26 of 208

Get top class preparation for Bank-PO right from your home: get questions, notes, tests, video lectures and more- for all subjects of Bank-PO.

Passage

Diagram of Nitrogen Cycle

Question 24 (1 of 2 Based on Passage)

Question

MCQ▾

In above diagram of nitrogen cycle conversion of ammonia to nitrite is done in the presence of which bacteria?

Choices

Choice (4)

a.

Nitrobacteria

b.

Nitrosamonas bacteria

c.

Rhizobium

d.

All of the above

Answer

b.

Explanation

Nitrosomonas is useful in phytoremediation . They are important in the N2 cycle by increasing the availability of nitrogen to plants while limiting CO2fixation. Such type of bacteria found in soil, freshwater, and on building shells, particularly in parts that contains high of nitrogen substances.

Question 25 (2 of 2 Based on Passage)

Question

MCQ▾

This the diagram of nitrogen cycle. What is v?

Choices

Choice (4)

a.

Ammonification

b.

Nitrogen fixation

c.

Nitrification

d.

Denitification

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.

Question 26

Question

MCQ▾

In above diagram what is producer?

Diagram of Grazing Food Chain

Choices

Choice (4)

a.

Bug

b.

Plant

c.

Boy

d.

Chicken

Answer

b.

Explanation

producers make their own food with the help of sun light. Example green plants and photosynthetic bacteria.

Developed by: