QUESTION 1 (4 marks)
a) Explain how a species interaction may be classified as symbiotic.
[2 marks]
b) Using an example, describe the symbiotic relationship of mutualism.
[2 marks]
QCAA guide · typeset solution
QCAA sample response and mark allocation
1 | a) | Symbiosis is an interspecific interaction in which the species live together in a long- term relationship. | • states that the interaction is between different species [1 mark] long-term [1 mark] | Alternatives for long-term are: close or intimate one species may benefit. |
1 | b) | Mutualism means that both species benefit from the interaction. An example is the relationship between zooxanthellae (photosynthesis producing nutrients for coral) and coral polyps (hosting the zooxanthellae, providing home). | • describes mutualism [1 mark] • describes a relevant example where each organism benefits [1 mark] | Examples are pairs of different species that demonstrate a mutualistic relationship. |
QCAA sample response and marking criteria reproduced from the official guide.
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