Form 4 Biology Question Paper

Form 4 Biology

Course:Biology

Exam Year:2012

ST. BERNARD SECONDARY SCHOOL
END OF TERM ONE EXAMINATION
FORM FOUR
BIOLOGY.
ANSWER ALL THE QUESTIONS
SECTION A
1. Define the term photosynthesis. ( 1 mk)

2.Illustrate by means of a simple labeled diagram the structure of a chloroplast.
(4 mks)
3. Explain the reason why variegated plants accumulate less food than non – variegated plants under similar conditions ( 3 mks)
4. State two functions of lipids in human body. ( 2 mks)

5. List four components of the pancreatic juice ( 4 mks)

6. Where is pepsin produced in the body? ( 1 mk)

7. What is homeostasis? ( 1 mk)

8. Explain the role of the following in the homeostasis
i) Skin
ii) Liver
iii) Hypothalamus ( 6 mks)

9. Name two common diseases that affect the liver and kidney. ( 2 mks)

10. Differentiate between homoitherms and ectotherms

11. Differentiate between continuous variation and discontinuous variation ( 2 mks)

12. What do we mean by the term genetics? ( 1 mk)

13. State one role of DNA in protein synthesis. ( 1 mk)
SECTION B 30 MKS
(Questions 14 and 15 are compulsory)
14. State and explain five types of chromosomal mutations (5mks)

15. Using a pedigrees show the genetic composition of the offspring between a marriages of a colour blind male with a woman of normal colour vision. (5mks)

(Do only one question)
16. In an experiment,a variety of garden peas having a smooth seed coat was crossed with a variety having a wrinkled seed coat.All the seeds obtained in F1 had a smooth seed coat.The F1 generation was selfed.The number of F1 generation was 7324.
a) Using appropriate letter symbols,work out the genotypes of the F1 generation.
b) From the information above,work out the following for the F2 generation.
1) Genotypic ratio.
2) The total number of wrinkled seeds.
3) Phenotypic ratio. (10mks)

OR
17.A couple with normal color vision had a color blind son Ali,and two normal daughters Edith and Grace .Ali had a daughter with a normal color vision. Edith had two sons, one color blind and the other had a normal color vision. What are the probable genotypes of the parents, their children and their grandchildren? Explain how you arrived at your conclusions; use a pedigree diagram to represent these genotypes. (10mks)

SECTION C

(Do only one of the questions below)
18. With a well labeled diagram, describe the function of kidney in the purification of blood and urine formation. (20MKS)

19. Describe the process of food digestion in duodenum of the human body. (20mks)
XXXENDXXX

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