Core Revision Questions for IGCSE Biology

The diagram shows a plant cell.
Which two parts are found in plant cells but not in animal cells? 

• 1 and 5 
• 2 and 3 
• 2 and 4 
• 3 and 5 

An experiment is carried out to investigate the effect of pH on the activity of an enzyme.
The graph shows the results. 
At which pH is this enzyme most active? 

• 2
• 5
• 7
• 12

What are characteristics of all living organisms? 

• breathing, photosynthesis and transpiration 
• circulation, excretion and nutrition 
• digestion, growth and movement 
• respiration, reproduction and sensitivity 

The diagram shows an animal cell. A student measured the maximum diameter of the diagram as 25mm. The maximum diameter of the actual cell was 0.02mm.
What is the magnification of the drawing? 

• ×25 
• ×200 
• ×1250 
• ×2500 

What describes an enzyme? 

• a protein that acts as a catalyst 
• a protein that acts as a hormone 
• a vitamin that acts as a catalyst 
• a vitamin that acts as a hormone 

What is the purpose of respiration? 

• to enrich the atmosphere with oxygen 
• to release energy for the organism 
• to supply water for the organism 
• to take oxygen into the lungs 

Where does most of the oxygen enter the blood? 

• an alveolus 
• a bronchiole 
• a bronchus 
• the trachea 

An oxpecker bird perches on the back of a buffalo while the buffalo feeds on grass. The bird eats ticks that feed on the blood of the buffalo. Which food chain represents these feeding relationships? 

• grass → buffalo → oxpecker → ticks 
• grass → buffalo → ticks → oxpecker 
• oxpecker → ticks → buffalo → grass 
• ticks → oxpecker → buffalo → grass 

Which statement about respiration is not correct? 

• Respiration always releases energy. 
• Respiration in green plants does not use oxygen. 
• Respiration occurs only in living cells. 
• Respiration provides energy for muscle contraction 

Which process depends on diffusion? 

• circulation 
• digestion 
• gas exchange 
• phagocytosis