IB MYP Biology Pathogens , Parasites , Predator and Prey Exam Style Question
IB myp 4-5 Biology – Practice Questions- All Topics
Topic :Interaction between organism-Pathogens/Parasites,Predator/Prey
Topic :Interaction between organism– Weightage : 21 %
All Questions for Topic : Pathogens/Parasites,Preadator/Prey,Food chains and webs,Competition,Speciation and Extinction
Question
Some interactions between organisms are harmful. Yearly, thousands of people die because of infection with the bacterium Vibrio cholerae, which causes the disease cholera.
Vibrio cholerae is a pathogen. (1 mark)
State the meaning of the term pathogen.
▶️Answer/Explanation
Ans:
an organism or virus that causes a disease or an infection
Question
List two life processes that a bacterium has in common with other living organisms.(2 marks)<
▶️Answer/Explanation
Ans:
Any two from (2 max):
• movement
• respiration
• response to stimulus
• growth
• reproduction
• excretion
• digestion or nutrition
Question
Vibro cholerae is transmitted through drinking contaminated water.
Suggest why cholera outbreaks often happen after natural disasters, such as hurricanes or floods. (2 marks)
▶️Answer/Explanation
Ans:
drinking water supply chains or sewage facilities are broken
Any additional reasonable point, for example:
• people do not have access to bottled or clean water
• people do not have access to antibiotics/cures/medical care
Question
The human body has natural defences which protect it from infection.
Outline how the skin and white blood cells protect the body from infection.(2 marks)
Skin
White blood cells
▶️Answer/Explanation
Ans:
Skin: physical barrier or pH or oils or sweat
White blood cells: destroy/deactivate/eat pathogen or produce
antibodies (in the bloodstream)
Question
Investigation skills
This task (questions 3 to 7 ) addresses the key concept of change and focuses on criterion \(\mathbf{B}\) (Inquiring and designing) and criterion \(\mathbf{C}\) (Processing and evaluating).
Environmental change impacts survival.
Aquatic plants are useful for many types of experiments.
The graph below shows the results from an investigation into how different plants affect the ability of small aquatic animals to hide from their predators. The experiment was done in a water tank with controlled numbers of plants, prey and predators.
3a .Identify the plant that resulted in the highest percentage average survival for the prey.(1 mark)
▶️Answer/Explanation
Ans: The native plants resulted in the highest percentage average survival for the prey.