(a) Explain the following terms:
(i) Producer
(ii) Consumer
(iii) Community
(iv) Decomposer.
(b) List four characteristics each of:
(i) Trees of the Tropical Rain Forest IP
(ii) Trees/Shrubs of the Savanna.
(a)(i) Define ecological succession.
(ii) List four characteristics of ecological succession of plants.
(b) Explain four factors which affect population size
(c) State the adaptation of tapeworm (Taenia Solium) to its habitat in the gut of human.
(a) What is sexual reproduction?
(b) State five functions of the placenta and four functions of the umbilical cord of a mammal.
(c) List four types of placentation in flowering plants.
(d) State four conditions necessary for seed germination.
(a) List the main constituents of mammalian blood.
(b) State two functions of each constituent.
(c) Tabulate six differences between arteries and veins.
(d) Name the main artery which transports blood to the:
(i) Lung
(ii) Kidney.
(a) What is a receptor?
(b) Describe the general features common to all receptors.
(c)(i) Make a labelled diagram 8cm – 10cm long, to show the outer and middle ear only of human.
(ii) List three ways of caring for the ear.
(a) Explain the terms:
(i) Parasitism
(ii) Commensalism
(b) Mention:
(i) one fungal parasite of a plant and its host
(ii) one bacterial parasite of humans.
(c)(i) List four symptoms of malaria.
(II) Mention six methods of controlling malaria in West Africa
Which of the following can be considered as a direct evidence of evolution?
- A. Classification
- B. Comparative anatomy
- C. Comparative embryology
- D. Fossil record
The following are social insects except
- A. wasps
- B. termites
- C. bees
- D. cotton stainer
Which of the following is an adaptation by plants to reduce the rate of water loss in a dry habitat? Possession of
- A. a few sunken stomata on the lower epidermis only
- B. long leaf tendrils
- C. leaves with serrated edges
- D. strong tap root
The genes affecting the same trait and are located at the same position on the homologous chromosomes
are called
- A. autosomes
- B. alleles
- C. loci
- D. chromatids
A man with heterozygous genotype for blood group B marries a woman with heterozygous A, what percentage
(%) of their children would be universal donor?
- A. 50%
- B. 25%
- C. 15%
- D. 10%
In humans, sex is determined by
- A. two homologous chromosomes
- B. a dominant gene for maleness present in a male
- C. two similar sex chromosomes in the male and dissimilar in the female
- D. the differences in the nature of the X and Y chromosomes in the male.
The name given to a sudden change in a gene or chromosome that can be passed on to the offspring is
- A. inheritance
- B. linkage
- C. alleles
- D. mutation
Which of the following is not a morphological variation in human beings?
- A. Size
- B. Blood groups
- C. Colour
- D. Fingerprints.
When Mendel crossed round seeds with wrinkled seeds of Pea Plant, what was the ratio of wrinkled seeds
to round seeds in the F2 plants?
- A. 3 : 1
- B. 2 : 1
- C. 1 : 3
- D. 1 : 2
Which of the following statements about blood groups in human is not correct?
- A. Siblings may not belong to the same blood group
- B. There are four possible blood groups
- C. People with blood group O can receive blood from all other groups
- D. People with blood group AB are universal recipients
Which of the following is a continuous variation, in human population?
- A. Sex
- B. Rh factor
- C. Height
- D. Down`s syndrome
Some species of animals and plants are considered as endangered, because
- A. they are found in large numbers in most habitats
- B. they are harmful to theta natural habitats
- C. their populations have become so small that they may soon die out
- D. they should be killed or only kept in cages
Which of these statements is true about fingerprint patterns?
- A. Consistent for a lifetime
- B. May be exactly the same for two individuals
- C. Prominent only at puberty
- D. Correlate with the individual blood group
Wildlife conservation is enhanced by
- A. enacting laws to encourage poaching
- B. discouraging elimination of endangered species
- C. encouraging creation of satellite hunting unit
- D. suppressing the activities of wildlife conservation agencies
A vegetable farmer will benefit from a cattle rearer if
- A. the faecal remains of the cattle are made available to the farmer
- B. the farmer makes available fresh green vegetables for consumption by the cattle daily.
- C. the farmer provides shelter for the cattle and the cattle rearer
- D. the cattle rearer makes available meat to the farmer daily