Ordinary level 2023 northwest regional mock biology 2
Ordinary level 2023 northwest regional mock biology 2
SECTION A
ANSWERALL THREE(3)QUESTIONS
a)i)Define the term enzyme.
ii) State the characteristics ofenzymes.
b)How are carbohydrates important to living organisms?
c)Describe an experiment to show thatproteinis presentin fish.
1
(9,6,5marks)
2. a)i.Explain the term digestion.
ii.Statetheimportanceofdigestiontoman.
b)i)How is the ileum adapted to carry out its function ofabsorption ofnutrients?
ii)Briefly outline the stages involvedintheproduction ofbread. (8,12marks)
3. a)Define the following terms:
i. Ecosystem,
ii. Environment.
b)How is Genetic Engineering useful to man?
c)Describe the water cycle. (9,6,5 marks<
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SECTIONS
ANSWER ANY TWO(2)QUESTIONS ”
4. a)Draw a large labeled diagramto show the longitudinal section ofthe mammalian heart.
b)Howdo whitebloodcells differfromredbloodcells?
c) Why isblood important to mammais? (9,6,5 marks)
5. a)Define the followingterms.
i. Respiration
ii. Breathing
b) What are the differences betweenrespirationandphotosynthesis?
e)Describe an experimentto show that carbon dioxide is producedby mammals during respiration.
(9,6,5 marks)
6 a)Briefly explain the following terms.
i) Pollination
ii)Germination
iii)Fertilization
b)Describehow the process offertilization is carried outin floweringplants
c)How is the cotton seed adapted to its mode ofdispersal? (9,6,5marks)
7. a)Define the following terms as usedin Genetics.
Complete dominance
u; Co-dominance
iii) Heterozygous
(b) When a white-winged Butterfly was crossed with a red-winged Butterfly, all the F, offspring had
patches of red and white on their wings. When the Fj offspring mated amongst themselves some of
theF2 offspring had while wings, some had red wings while the others had red and white patches on
the wings. Using appropriate genetic symbols and diagrams, explain these results as best as possible.
(9,11marks)
