Here are the solutions to your questions:
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In an investigation, a student collected two plants A and B. Plant A had hairy leaves and epidermis. Leaves of plant B
a) (i) Plant A: Hairy epidermis
b) (ii) Plant B: Smooth epidermis (assuming it is the contrasting type, as no specific information is provided for Plant B's epidermis)
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An investigation was carried out between 1964 and 1973 to study the changes of fish population in a certain small lake. Four species of fish A, B, C and D were found to live in this lake. In 1965 a factory was built near the lake and was found to discharge hot water