IB myp 4-5 Biology – Practice Questions- All Topics
Topic :Human interactions with environments-Pollution/Conservation
Topic :Human interactions with environments– Weightage : 21 %
All Questions for Topic : Human influences,Habitat Change or destruction,Pollution/Conservation,Over Exploitation,Mitigation of adverse effects
Question
b.Due to various man made and non man made reasons, the population sizes of a species can decrease. This can be caused by disease, competition, lack of resources, habitat loss, climate change, pollution, invasive species and overhunting.
▶️Answer/Explanation
Ans:
One example of a change, for example (1 max):
- increased predation
- habitat reduction
- decreased food supply
- increased competition
- disease
- natural disaster
- a specific example of human interference
Correct justification, for example:
- eaten before they reproduce
- insufficient resources for shelter or camouflage
- unlikely to be healthy enough to reproduce
- decreased availability of resources
- large scale death
- any direct link to human interference
Question:
The bar chart below shows the age estimates produced by the research.
a) What was the age of the oldest narwhal?
▶️Answer/Explanation
Ans: 110–115 years
b) What was the most frequent age of the narwhals?
▶️Answer/Explanation
Ans: 0–9 years
c) Suggest a reason for the scientists not being able to determine the sex of some of the narwhals.
▶️Answer/Explanation
Ans: Too young/had not yet reached puberty.
Question:
The chart below is an age pyramid for the human population in Greenland in 2014.
a) Draw an age pyramid chart for the narwhals investigated in West Greenland.
▶️Answer/Explanation
Ans: Award marks on a scale from 0 marks for an age pyramid without merit up to three marks for a clear and accurate pyramid.
b) Suggest reasons for the differences between the human and the narwhal age pyramids.
▶️Answer/Explanation
Ans: Hunting of narwhal causes lower life expectancy/steeper decline in numbers with increasing age; human life expectancy is increased by health care/good nutrition/lack of competition for food/fewer physical dangers; any reasonable reason for larger numbers of male than female narwhal.