IB MYP Biology factors affecting human health Exam Style Practice Questions
IB myp 4-5 Biology – Practice Questions- All Topics
Topic :Cells-Factors affecting human health
Topic :Cells– Weightage : 21 %
All Questions for Topic : Tissues,Organs,System,Structure and Function,Life processes,Factors affecting human health,Vaccination
Question -IB MYP Biology factors affecting human health
Scientists are looking for ways to keep food fresh for longer. Active packaging changes the conditions inside the packaging to extend the time food stays in good condition and is safe to eat.
As bananas ripen, they produce a gas that speeds up the ripening process. The image below shows how active packaging can absorb and remove this gas.
Question (2 mark)
Other active packaging solutions work by keeping temperature constant. Describe why many foods are stored between \(3^{\circ} \mathrm{C}\) and \(5^{\circ} \mathrm{C}\).
▶️Answer/Explanation
Ans:
(This temperature range) reduces or stops microorganism activity or reproduction
Does not freeze (at this temperature range)
One correct justification, [max 1]
• slows deterioration of food
• prevents ice damage or freezer burn or changes in appearance
Question (2 mark)
Before active packaging was developed, people used other methods to keep food fresh for longer. Historically, salt was put on meat to kill bacteria and prevent them from multiplying. The microscope images below show bacteria on fresh and salted meat.(3 marks)
Describe why bacteria on salted meat have changed their form and no longer have a smooth surface.
▶️Answer/Explanation
Ans:
(Bacteria has) decreased in volume or shrunk or shrivelled
Water has left or (bacteria is) dehydrated
By osmosis
Question (2 mark)
Outline the importance of enzymes in the body. (2 marks)
▶️Answer/Explanation
Ans:
Speed up reactions or biological catalyst
Build up molecules or break down molecules