b) What energy changes take place in the following processes?
i) When a mango drops from the tree
ii) A carpenter hits a nail with a hammer
iii) A torch is switched on
c) i) Draw a well labelled diagram of a flower.
ii) Of what importance is the flower to the plant?
d) Name the sense organs and start on function of each.
QUESTION 2
a) i) What is soil erosion? Give two types of soil erosion.
ii) Give three activities of man that can cause soil erosion.
iii) List three ways by which soil can be conserved.
b) i) What is a lever?
ii) Classify the following under first class, second class and third class levers.
Sugar tong
Bottle opener
Paper cutter
A pair of scissors
Fishing rod
Claw hammer
c) In each of the following activities state
whether the changes that occurred are:
i) physical or chemical
ii) reversible or irreversible
I. Some boiled cassava and plantain were pounded together into fufu.
II. A piece of ice block is put in a cup. After a while, it was found out that the block had changed into a liquid.
III. A clean piece of nail was put into a beaker of water. After five days it was observed that the colour of the nail had changed.
QUESTION 3
For each of the following diseases, name the causative organism and one method of prevention.
i. Cholera
ii. Bilharzia
iii. Malaria
iv. Tuberculosis
b) Show how you would separate each of the following mixtures:
i) Common salt and sand
ii) Muddy water
c) Explain why the planets and their moons move around the sun but they do not clash.
d) Give two uses of the sun’s energy in everyday life.
QUESTION 4
a) i) What id pollution
ii) Name two types of pollution. For each type give one pollutant and its source.
b) i) Explain the term vegetative reproduction.
ii) Give two local examples of plants that reproduce vegetatively.
c) i) List the part of an atom and show the electrical charges of each of the parts.
ii) Explain the term work.
iii) Distinguish between heat and temperature and give their units.