Biology Past Questions and Answers

a. Name five vertebrae in mammals with their corresponding locations. [10 marks]
b. State one function each of the following parts in a dicotyledonous leaf:
(i) palisade;
(ii) vascular bundle;
(iii) epidermis. [3 marks]
c. State one function each of the following parts in the stem of a flowering plant:
(i) sieve tube;
(ii) cortex;
(iii) pith.
d. In a tabular form, state:
(i) two external structural differences between the stem and root of a maize seeding. [2 marks]
(ii) two internal structural differences between the stem and root of a maize seeding. [2 marks]

a. State three features of the small intestine that increase the rate of absorption of digested food. [3 marks]
b. Explain briefly what happens to the glucose formed in a plant during photosynthesis. [3 marks]
c. Explain briefly the mode of feeding in each of the following organisms:
(i) Euglena; [4 marks]
(ii) Spirogyra. [4 marks]
d. State three characteristics of an Estuarine habitat. [3 marks]
e. State three differences between an aquatic habitat and a terrestrial habitat. [3 marks]

a. State five :
(i) challenges that make conservation of resources difficult; [5 marks]
(ii) ways by which the Government of a country ensures conservation of natural resources. [5 marks]
b. What is an endangered species? [3 marks]
c. A child with blood group O was born to a mother of blood group A.
(i) What is the blood group genotype of the child? [1 marks]
(ii) What are the possible blood group genotypes of the father? [3 marks]
d. State three reasons why genetic variation is important to plants. [3 marks]

A homozygous tall, red flower plant was crossed with a homozygous dwarf, white flower plant. The F1 were selfed and 160 F2 plants were obtained.

a.(i) Name the type of genetic cross. [1 marks]
(ii) State one reason for the answer in 4(a)(i). [1 marks]
b.(i) What is evolution? [2 marks]
(ii) With the aid of a genetic diagram, state the phenotypic ratio of F2 generation. [13 marks]
(iii) Calculate the number of tall and white flowers that would be obtained in the F2 generation. [3 marks]

a. (i) Complete the table below with the respiratory surface of each of the listed organisms.

organism	respiratory surface
Tadpole (2days old)
Cockroach
Domestic fowl
Talinum
Earth Worm
Amoeba

(ii) State five characteristic features of respiratory surfaces in organisms. [5 marks]
b. Make a drawing, 4 cm – 6 cm long of the respiratory organ in Tilapia and label fully. [9 marks]