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Summary BiologyChemistryPhysicsQuestionsForOcr
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Questions for Biology, Chemistry and Physics. Exam Board: OCR Gateway. Perfect for revision at GCSE's
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Biology: B21. Mushrooms are decomposers, what’s the role of mushrooms in the
nitrogen cycle?
Respiration/ excretion
2. Suggest how plants are adapted to live in hot and dry conditions
Have long or deep or wide or spreading roots to collect water
3. How it CO2 added to the atmosphere?
Decay of organisms / combustion
4. What process removes CO2 from the atmosphere?
Photosynthesis
5. How is ammonia converted in the nitrogen cycle?
Converted to nitrates by nitrifying bacteria in soil, plants absorb nitrates
from the soil
6. How can an increase of CO2 lead to global warming?
Allows the sun’s rays pass through the atmosphere, CO2 traps heat
7. Why is it harder to obtain the data to draw a pyramid of biomass than a
pyramid of numbers?
The pyramid of biomass needs dry mass which means killing the organism
and drying all the water out of it.
8. What does parasite mean?
An organism which lives off another organism, its host
9. What information is needed to construct a pyramid of biomass?
Measurement of dry mass in each trophic level
10. Describe how the counter-current system works.
Warm blood entering the feet flows past cold blood leaving the feet and
warms it up. The warmed-up blood re-enters the body and doesn’t affect the
penguin’s core temperature.
11. Why does a pyramid of biomass have a different shape to a pyramid of
numbers?
Organisms are different sizes so biomass depends on number and size
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