Biology Advanced level GCE question Paper 2016

Biology Advanced level GCE question Paper 2016 Cameroon

(1) (a) Define excretion.

(b) state tne waste products of metabolism in vertebrates, their origin and the structures responsible
for their elimination.

(C) Describe:

(I) the production and

(ii) the removal of urea in mammals.

(2, 13, 5 marks)
(Total = 20 marks)

(2) (a) Explain how the structures of:

(I)    Chloroplast and

(11) Mitochondrion are adapted to their functions.

(b) Using only structures, differentiate between a bacterial and a chlorenchyma cell as revealed by an
electron microscope.

(c) What are the advantages and disadvantages of using the light and electron microscopes to study cell
organelles?

(10, 5, 5 marks)
(Total = 20 marks)

3 (a) (I) What are the effects of oil pollution on marine and coastal environments?

(ii) List five recent techniques for treating and preventing oil pollution.

(b) How can our land be conserved to ensure greater survival of species?

(c) State how you can ensure that the clean-up campaigns in our cities are more effective.
(10, 6, 4 marks)
(Total = 20 marks)

4 (a) List the characteristic properties of hormones

   (b) Explain briefly how hormones enter their target cells and exert their effects

(c) Discuss the role of auxins in flowering plants.
(4,8,8 marks)
(Total = 20 marks)

5 (a) (I) What is accommodation with respect to vision?

         (ii) How are far and near objects focused by the eye?

    (b) List the differences between the photosensitive cells tfound in the retina of the eye.

    (c) How are synapses important in the transmission oI nervous impulses in mammals?

(10, 5, 5 marks)
(Total = 20 marks)

6 (a) Why do multicellular animals need a transport system?

(b) Differentiate between lymphatic and blood circulatory systems.

(c) State the role of the lymphatic system in the defence mechanism of the body.
(4,8, 8 marks)
(Total 20 marks)

7 (a) Define the following genetic terms

 -Gamete
 -Zygote
-Chromosome
-Homozygous
-Heterozygous

(b) Assume that browr hair colour is a genetic characteristic which is sex-linked and lethal in the
homozygous recessive state. Carry out a cross and state the proportions of offspring produced if a
woman who is heterozygous with brown hair is crossed with a homozygous dominant brown haired man
(10, 10 marks)
(Total=20 marks)

8 (a) Define the following terms as used in genetic engineering

-Recombinant DNA
-Complementary DNA
-Restriction enzymes
-DNA ligase
-Vector
-Host
-Plasmid
-Reverse transcriptase
-Transgenic organism
-DNA polymerase

(b) Write short notes on the following:


(I) Applications of Biotechnology in the fields of medicine.

(ii) Application of Biotechnology in the field of agriculture.
(10, 10 marks
(Total=20 marko