IB myp 4-5 Biology – Practice Questions- All Topics
Topic :Cells-Vaccination
Topic :Cells– Weightage : 21 %
All Questions for Topic : Tissues,Organs,System,Structure and Function,Life processes,Factors affecting human health,Vaccination
Investigating food absorption
Dialysis tubing is manufactured for use in kidney machines. It can be used to simulate absorption of food by diffusion in the gut, because it is similar in permeability. The diagram shows how such a simulation could be contrived.
Possible foods to test:
The presence of such foods can be detected using these methods:
● glucose—with urine test strips or with Benedict’s test
● starch—with the iodine test
● amino acids—with universal indicator or a pH probe
● casein—with the biuret test.
Question:
Formulate a hypothesis for the function of the gut (to digest food) and explain it using scientific reasoning.
▶️Answer/Explanation
Ans: Undigested food molecules are too large/insoluble; for absorption; so must be broken down into smaller/more soluble molecules.
Question:
Design an experiment to test your hypothesis, including how you will control the variables.
▶️Answer/Explanation
Ans: Design should include clear statement of independent, dependent and control variables, rationale for the method and practical details, consideration of ethics and risks, with marks awarded on a scale from 0 marks for a completely inadequate design to eight marks for an exemplary design.