O level north west regional mock gce 2022 biology 2
O level north west regional mock gce 2022 biology 2
(a) What is the chemical conation of:
i) Carbohydrates?
ji) Proteins? (4 marks)
(b) How would you demonstrate that germinating seeds contain proteins? (5 marks)
(c) What ts the importance of
i in defending the body against pathogens?
ii ) Recombinant DNA
iii)Vcetors (9 marks)
(b) How is biotechnology advantageous and disadvantageous to man?
(c) Describe (he process of bread•making.
SEC I ION U: Answer any TWO (2) questions.
4 . a (i) Draw a diagram to locate the various endocrine glands in the human body.
(ii) Name one hormone that is released by each of the six endocrine glands in the human body.
(6 marks)
(6 marks)
b (i) What do you understand by homeostasis?
(ii) Name three homeostatic organs in man and state the factor that each organ controls.
a) Differentiate between complete dominance and incomplete dominance
b) A hortieulturalist crossed a red-flowered plant with a white-flowered plant and all the FI plants had
red flow’ers. WTien these FI plants were self-pollinated, 546 red-flowered and 180 white-flowered
offspring were produced.
(j) Using appropriate genetic symbols and diagrams, explain the genetics of these crosses (12 marks)
(ii) What w’ould be the results of a cross between an F2 heterozygous plant and a white-flowered
Plant?
6. a), (i) Define the term photosynthesis.
(ii) List the environmental factors that affect the rate of photosynthesis.
b). (i) Write down a balanced chemical equation of aerobic respiration in plants,
(ii) What is the importance of respiration to organisms?
c). How is photosynthesis different from respiration ?
7. a). Draw a large labeled diagram to show the structure of the kidney nephron.
b). In a tabular form, state the functions of the parts labeled in 7(a) above.
c). Why is excretion necessary’ in organisms?
d). How does tlie kidney nephron functiun^n osinoregulatiun .
