(a) (i) State the difference between an opaque object and a translucent object.
(ii) Give one example each of an opaque and a translucent material.
(b) (i) What is the importance of seed dispersal?
(ii) Name two types of fruits and state their mode of dispersal.
(c) (i) What is recycling?
(ii) Give two advantages of recycling of materials
(iii) List three recycled products in Ghana.

(a) (i) Explain the term bedwetting?
(ii) State two diseases that may result from bedwetting
(b) (i) State the difference between hard water and impure water.
(ii) Give the stages involved in the treatment of water for a community.
(c) A piece of stone has a mass of 36.0 g. When it is put into water in a glass container, the level of water rises from 60.0 cm3 to 90.0 cm3.
(i) Calculate the density of the stone.
(ii) Explain what will be observed when the stone is put into another liquid of density 1.4 gcm3?

(a) (i) What is an echo?
(ii) State two uses of echoes
(b) (i) State three diseases that affect the respiratory system of human.
(ii) Name one method each by which the diseases you have named can be prevented.
(c) (i) What is biotechnology?
(ii) List three products that are obtained from biotechnology.

(a) (i) Define pressure
(ii) State three applications of pressure in everyday life.
(b) State four functions of the liver in digestion (c) (i) What is a compound?
(ii) Give two properties of a compound
(iii) Write down the name and the chemical formula of the compound formed between the following elements:
(α) hydrogen and chlorine
(β) magnesium and oxygen