4.3 Reduce the urchin population.  4.4 Sea otter would become extinct. 


Question 5 5.1 A: bacteria,  B: protest,  C: virus 


5.2 Virus: influenza, rabies, HIV  (any 1) Bacteria: TB  Protist: malaria 


5.3 Product


Yoghurt Bread


Antibiotic Bacteria 


Yeast (fungus)  Bacteria 


(3) [9]


Total: 35 marks Strand 2 Revision memorandum Learner’s Book pages 98–99


Question 1 1.1 D 


1.2 C  1.3 A  1.4 E  1.5 B 


Question 2 2.1 B,  has 1 proton 


2.2 A,  has 6 protons 


Question 3 3.1 2  3.2 1 


3.3 Water  3.4 Compound  140


(1) (1) (1) (1)


(1) [5]


(2)


(2) [4]


(1) (1) (1) (1)


Made by …


(1) (1)


4.5 They are very spiny  and few predators are adapted to eat them.  (2) [9]


(3) (1) (1) (1)


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