Question 1
Which is the correct definition for a species?
A group of organisms which look similar.
A group of organisms with similar characteristics.
A group of organisms which can interbreed to produce fertile offspring.
A group of living things.
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DP IB Biology: HL
Topic Questions
4.1 Species, Communities, Ecosystems & Energy Flow
Question 2
Euglena is an autotroph.
Identify, from the diagram, the feature which indicates this is an autotrophic organism.
Nucleolus
Chloroplast
Contractile vacuole
Mitochondria
Question 3
Which option correctly lists some abiotic features of an ecosystem?
Mineral ions, light intensity, temperature
Competition, predation
pH, producers, mineral ions
Wind speed, decomposition, mineral ions
Question 4
Identify the main energy transfers carried out by the organisms in the food web below:
| Grass | Rabbit | |
| A | light → chemical | chemical → light |
| B | chemical → light | kinetic → heat |
| C | light → heat | chemical → thermal |
| D | light → chemical | chemical → kinetic |
Question 5
A simple aquatic mesocosm is shown below
Why is A an important component of the mesocosm?
A provides protection for the primary consumers from predators.
A converts heat energy to chemical energy.
A provides carbohydrates and oxygen to support the mesocosm.
A helps to maintain a stable temperature.
