IB MYP Biology homeostasis Exam Style Practice Questions
IB myp 4-5 Biology – Practice Questions- All Topics
Topic :Homestasis
Topic :Metabolism– Weightage : 21 %
All Questions for Topic : Nutrition,Digestion,Biochemistry and enzymes,Movement and transport,Diffusion,Osmosis,Gas exchange,Circulation,Transpiration and Translocation,Homeostasis
Question (10 marks)–IB MYP Biology homeostasis
This model represents an example of homeostasis in the human body.
(2 marks)
Select two body systems that interact to monitor and maintain a constant body temperature.
System to monitor temperature:
System to maintain temperature:
▶️Answer/Explanation
Ans:
nervous system
cardio-vascular system or muscular system
Question (3 marks)
Using your answer to part (a), describe how these two systems work together to respond to a reduction in body temperature.
▶️Answer/Explanation
Ans:
the nervous system detects or communicates (the reduction in temperature)
causing vasoconstriction / blood vessels narrow
or
blood is diverted away from extremities
(thereby) reducing heat loss
Or
the nervous system detects or communicates (the reduction in temperature)
causing hairs to rise
(thereby) reducing heat loss
Or
the nervous system detects or communicates (the reduction in temperature)
causing shivering / involuntary muscle contractions
produce heat or increased cellular respiration (in the muscles)
Question:
a) Calculate the difference in body mass between the groups raised in high and low water.
▶️Answer/Explanation
Ans: 1.9 – 1.2 = 0.7 grams
b) Explain the difference in body mass.
▶️Answer/Explanation
Ans: Grow to a larger size before metamorphosis in high water.