HARD
Upper Secondary: IGCSE
IMPORTANT
Earn 100

Explain the difference between each of the following pairs, giving examples where you can: Pyramid of biomass and pyramid of numbers.

Important Questions on Organisms and their Environment

MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 20 - Organisms and their Environment>End-of-chapter questions>Q 3
Why do living organisms need nitrogen?
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 20 - Organisms and their Environment>End-of-chapter questions>Q 3
 Explain why plants and animals cannot use the nitrogen in the air?
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 20 - Organisms and their Environment>End-of-chapter questions>Q 3
What is nitrogen fixation?
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 20 - Organisms and their Environment>End-of-chapter questions>Q 3
Where do nitrogen-fixing bacteria live?
HARD
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 20 - Organisms and their Environment>End-of-chapter questions>Q 3
Explain how animals obtain nitrogen?
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 20 - Organisms and their Environment>End-of-chapter questions>Q 3
What do nitrifying bacteria do?
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 20 - Organisms and their Environment>End-of-chapter questions>Q 3
Which type of bacteria return nitrogen to the air?
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 20 - Organisms and their Environment>End-of-chapter questions>Q 4

In what form do each of the following obtain their nitrogen?

  1. A green plant