Biology Past Questions and Answers

b. List five parts of the alimentary canal of an earthworm. [5 marks]
c. State six ways by which water could be polluted by agricultural. [6 marks]
d. Describe briefly the life cycle of a housefly. [5 marks]
e. Make a diagram, 6 cm – 8 cm long of the hypogeal germination in a mature maize seedling and label fully. [8 marks]

The table below shows the percentage composition of fat and protein in six different meat types. Study it and answer questions 2(a) to 2(d).

Meat Type	Fat (%)	Protein (%)
A	07.2	21.3
B	25.3	10.6
C	20.0	22.5
D	03.1	28.2
E	12.6	17.3
F	13.2	14.3

a. (i) Which two of the meat types may be recommended for an obese patient? [2 marks]
(ii) State one reason for the answer in 2(a)(i). [1 mark]
b. (i) Which two of the meat types would provide the most energy? [2 marks]
(ii) State two reasons for the answer in 2(b)(i). [2 marks]
c. (i) Which three of the meat types could be recommended for a child suffering from kwashiorkor? [3 marks]
(ii) State one reason for the answer in 2(c)(i) [1 mark]
d. Which of the meat types would most likely be suitable for:
(i) an active teenager; [1 mark]
(ii) a 70-year old human? [1 mark]
e. Which other class of food provides energy? [1 mark]
f. State three uses of fat in the human body. [3 marks]
g. Describe briefly the procedure for testing for fat in a meat sample using a piece of white paper. [3 marks]

a. Classify the following biological associations under the headings in the table below:
(i) Remora and shark;
(ii) Lichen;
(iii) Cattle and white Egret;
(iv) Tapeworm in the gut of humans;
(v) Flowers and Honeybees;
(vi) Mistletoe and Cacao plant.

Parasitism	Mutualism	Commensalism

[6 marks]
b. (i) State three adaptive features of parasites. [6 marks]
(ii) State two effects of parasites on their hosts. [2 marks]
c. (i) What are saprophytes? [2 marks]
(ii) Give four examples of saprophytes. [4 marks]

Use the information below to answer questions (a)(i) and (a)(ii).
Hb Are presents normal haemoglobin,
HbS represents sickled haemoglobin.

a. A female heterozygote for sickle cell married a sickler. With the aid of a genetic diagram, determine the:
(i) possible genotypes of their offspring; [8 marks]
(ii) phenotypic ratio of the offspring. [2 marks]
b. Explain briefly the reason why a Rhesus negative woman married to a Rhesus positive man might lose her second pregnancy. [5 marks]
c. Name two examples of features in animals that support the theory of use and disuse of body parts as used by Lamarck. [2 marks]
d. List three structures in mammals that are vestigial. [3 marks]

a. Explain briefly the importance of the following factors and organisms in the nitrogen cycle
(i) lightning; [3 marks]
(ii) Nitrosomonas; [2 marks]
(iii) Azotobacter. [2 marks]
b. Name the excretory organ in:
(i) insects: [1 mark]
(ii) earthworm.
c. Define
(i) hepatitis; [4 marks]
(ii) kidney stones [4marks]
d. (i) State three effects of lack of sense receptors in the skin to humans. [3 marks]
(ii) List three layers of the epidermis in the skin of humans. [3 marks]
e. (i) What is metamorphosis? [2 marks]
(ii) State the type of metamorphosis exhibited by each of the following insects listed in the table below.

Insect	Type of metamorphosis
Grasshopper
Cockroach
Butterfly
Mosquito
Housefly