a) What is a living cell?

b) Give one function of each of the following components of a living cell:
(i) cell membrane
(ii) chloroplast
(iii) nucleus

c) Make sketches to show the arrangement of the particles in each of the three states of matter.

d) What instrument would you use to measure each of the following quantities:
(i) volume of a liquid
(ii) mass of a stone
(iii) time
(iv) speed of the wind?

a) Name three deficiency diseases associated with diet and state their causes.

b) (i) What is hard water?
(ii) Mention three ways by which hard water can be made soft.

c) (i) Explain how sound is produced.
(ii) State one example each, of the following instruments
α) wind instrument
β) string instrument

a) State two examples of a
(i) carnivore
(ii) herbivore

b) What is the difference between egestion and excretion?

c) Explain briefly why
(i) gold is used to make necklaces and earrings.
(ii) steel is used instead of iron to make car bodies

d) (i) What is surface tension?
(ii) Explain why the surface of water in a container is not flat but curved.

Copy and complete the table below:

b) Name two different particles of matter which carry
(i) a negative charge
(ii) a positive charge
(iii) no charge

c) A simple machine moves a load of 20N through a distance of 2m. If it uses an effort of 25N which moves through a distance of 4 m, calculate the
(i) work input
(ii) work output
(iii) efficiency of the machine