◈ Oracle Prep Sign Up Free

O-LevelBiologyEcology & Environment5090/11 · May/June 2025 · Q381 Mark

What is the principal source of energy in most biological systems?

Abacteria

Bphotosynthesis

Crespiration

Dsunlight

✓ Correct answer

D: sunlight

Practise more questions on this topic

Oracle Prep sorts past-paper questions by topic, so you can drill Ecology & Environment and see which topics are most likely to come up next.

Sign up free →

About this question

Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2025 Paper 1 Variant 1, question 38.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content

Related Biology questions

Ecology & EnvironmentMay/June 20101m

Which bacteria convert urea to ammonia?

Ecology & EnvironmentMay/June 20101m

Which control measure would not help to prevent the spread of malaria?

Ecology & EnvironmentMay/June 20101m

Why is it important to control the amount of nitrate fertiliser used on farm land?

Coordination & ResponseMay/June 20131m

What are the effects of the excessive consumption of alcohol?

RespirationMay/June 20131m

During the production of alcohol, why must air be kept out of the fermenter?

Transport in HumansMay/June 20131m

Where does the placenta allow the exchange of materials to take place between mother and fetus?

← Browse all past-paper questions