Transfer of Energy & Matter | HL IB Biology Topic Questions 2025

11 mark

Identify the main energy transfers carried out by the organisms in the food web below:

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1

1 mark

Which row of the table correctly identifies an observation of food chains and the theory used to explain that observation?

	Observation	Theory
I	Food chains are short	Energy losses occur at each trophic level
II	Food chains have a pyramid structure	Organisms with a larger biomass provide more energy to the next trophic level
III	Food chains all start with a producer	Producers transfer energy most efficiently
IV	Energy losses occur at each trophic level	Energy is transferred to the surroundings during respiration

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11 mark

Which of the following statements about inorganic nutrients are correct?

Living organisms gain all of their inorganic nutrients from the abiotic environment.
Inorganic nutrients include simple compounds of carbon, hydrogen, oxygen, and nitrogen.
Organisms need inorganic nutrients to build organic molecules.

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A	Carbon dioxide levels fluctuate yearly due to seasonal changes in photosynthesis	Average carbon dioxide levels are increasing	Average yearly carbon dioxide level increases vary from year to year
B	Carbon dioxide levels fluctuate yearly	Average carbon dioxide levels increased between 1960-2010	Average yearly carbon dioxide level increases vary from year to year
C	Carbon dioxide levels fluctuate yearly	Average carbon dioxide levels are increasing	Average yearly carbon dioxide level increases vary from year to year
D	Carbon dioxide levels fluctuate yearly due to seasonal changes in photosynthesis	Average carbon dioxide levels increased between 1960-2010	Average yearly carbon dioxide level increases are linear

Transfer of Energy & Matter (HL IB Biology)