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1. Many external environmental factors affect the growth of bacteria. List and explain 2 features
that make the human body an ideal “home” for bacteria. (4 points)
Solution
Environmental factors which affects bacterial growth includes
1. Temperature
2. pH
3. Moisture
4. Oxygen
TEMPERATURE is important for growth and multiplication of bacteria. Most of them need
warm temperatures for their survival and as human body has a maintained temperature of around
37°C it providers ideal environmental conditions for their growth.
pH is important for bacterial growth. Highly acidic environment hamper their growth. They
prefer to multiply near to neutral pH and pH of human blood being near to 7.0 it provides best
environment for their growth.

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