Answer:
(a)Able to explain the interaction in X and Y
Organism X
F: mutualism (reject symbiosis) ...1m
E1: nitrogen-fixing bacteria/ Rhizobium convert atmospheric nitrogen into ammonia and ammonium ions that are used by (legume) plant for protein synthesis ....1m
E2: The bacteria obtain food/nutrient/ space/ shelter (from the plants) ...1m
Organism Y
F: commensalism (reject epiphyte) ....1m
E1: (pigeon orchids) grow on the trunks of the tree to obtain light energy for photosynthesis ...1m
E2: the host plant do not get benefit or harm .....1m maximum 5 marks
(b) Able to identify the interaction and explain how the organism survive on the habitat.
Interaction: Saprophytism ....................1m
F: Fungi/ mushroom secrete enzyme ...........................1m
E1: digest (organic food in) dead organism/ the tree trunk .....................1m
E2: (hypha) absorb the digested food such as glucose ................1m
E3: glucose is used for respiration//to get energy ...................1m
(5 marks)
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