Q1.(i) What is an enzyme?
(ii) Give three characteristics of enzymes.
iii) State the end product of digesting each of the following foods:
(!)carbohydrate
(!!) Proteins
(!!!) Fats
Q2a.Define the following terms
(I) salt ii) tissue iii)magnetic field
b. Name one example of each of the following salt.
(i)a normal salt (ii)an acidic salt (iii)a double salt
C. List four types of tissues and state one function of each.
Q3. a. Define each of the following terms and state one application of each
i) Cracking
ii) Polymerization
iii) Saponification
b.(i) Differentiate between music and noise.
(ii) Explain the following observation :
No sound is heard by an observer when an electric rings in an evacuated bell jar.
Q4. Distinguish between a saturated hydrocarbon and an unsaturated hydrocarbon.
ii) write down the molecular formulae of the following hydrocarbon, a named
(ą) four carbon Alkane
(¥) four carbon alkene
Q5. Distinguish between a cereal and a grain.
(ii) Give two examples of each.
Q6. What is a computer hard disc?
(ii) State five benefits of nuclear energy to humans.
b. What is a fertilizer?
(ii) State three effect of improper application of inorganic fertilizer.
Q7a. Distinguish between electromotive force (e.m.f) and potential difference.
b. Draw and label the apparatus for the preparation and collection of oxygen gas from hydrogen peroxide.
C. Explain how the ear brings about hearing.
Q8. What is fermentation?
ii. State three important application of fermentation.
b. What is a lawn?
ii. List three ways of maintaining an established lawn.
c. Name the components of steel.
(ii) Give four advantages that steel have over iron in the construction industry.
Q9a. What is a hedge?
ii) State three ways in which hedges can be useful to man
b. What is an alloy?
ii) What are the main elements present in each of the following alloys:
Bronze
Duralumin
Nichrome
Q10. What is a hormone?
(ii)Name three mammalian and state one function each.
b. Describe an experiment to show that light travels in a straight line.
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