(a) Write short notes on the following:
(i) habitat
(ii) ecological niche.
(b) (i) List three instruments used in the measurement of different ecological factors.
(ii) Briefly state what each instrument listed in (b) (i) above is used for.
(c) Name; (i) three plants (ii) two animals found in savannah vegetation.
(a) Explain the following terms:
(i) trait
(ii) recessive gene
(iii) test cross
(iv) heterozygous
(b) How do you determine whether a man with blood group ‘0’ and married to a woman with blood group ‘AB’ is the father of a child with blood group ‘AB’ born to them?
(c) (i) In rabbit brown hair is dominant over white hair colour. How could you determine that a brown coloured male rabbit is homozygous?
(ii) What is the difference between the chromosome number of a gamete and that of the body cell of the same organism?
(a) (i) Define asexual reproduction.
(ii) Name two types of asexual reproduction which occur in animals giving one example in each case.
(b) In a tabular form outline four differences between sexual and asexual reproduction.
(c) Make a large, labelled diagram 8 – 10cm long of the human spermatozoon to show its structure.
(d) State one function each of any three organelles found in the spermatozoon.
(a) Define enzymes.
(b) State six characteristics of enzymes.
(c) Describe the role of pancreatic juice in the digestion of carbohydrates and proteins in a mammal.
(d) In what form is carbohydrate stored in (i) animals (ii) plants
(e) Describe the saprophytic nutrition of Rhizopus.
(a) List four functions of.the mammalian skeleton and name a particular part of the skeleton which performs each of these functions.
(b) Briefly describe how muscles and bones bring about movement at the elbow.
(c) How is support provided for in each of the following plants? (i) Herbaceous plants (ii) Woody plants.
(d) Name one vitamin and one mineral element necessary for healthy development of bones.
(a) Write a short note on the importance of the presence of an effective transport system in mammals.
(b) state eight functions of blood in mammals.
(c) list four materials transported in the bodies of flowering plants.
Which of the following is not an evidence of evolution?
- A. Fossil records
- B. Comparative embryology
- C. Polymorphism
- D. Comparative anatomy
A honey bee worker communicates with others on locating a source of food by
- A. dancing
- B. stinging
- C. instinct
- D. flares
Territoriality is a phenomenon among
- A. lower organisms
- B. plants of different species
- C. male animals with a group of females
- D. animals and plants
Which of the following organisms is a social insect?
- A. Grasshopper
- B. Honey bee
- C. Butterfly
- D. Housefly
Which of the following is not a correct base pairing on the DNA strand?
- A. Adenine, Thymine
- B. Cytosine, Guanine
- C. Guanine, Cytosine
- D. Uracil, Thymine
In a living cell, factors which are responsible for inheritance are located
- A. on the nuclear membrane
- B. on the nucleolus
- C. on the chromosomes
- D. in the nucleoplasm
Which disease is sex-linked and mainly afflicts male offspring?
- A. Sickle cell anaemia
- B. Haemophilia
- C. Diabetes
- D. Malaria
If two parents are sickle cell carriers then their genotypes would be
- A. HbA HbA and HbS HbS
- B. . HbS BbS and HbS BbS
- C. HbA HbS and HbA HbS
- D. HbA HbA and HbA HbA
If the pink colour of a petal is dominant over white what would be the colour of the flower of the F generation when a pure pink flowered plant is crossed with a white flowered plant?
- A. Purple
- B. Pink
- C. White
- D. Yellow
A person with blood group B can only donate blood to individuals with blood groups
- A. A and B
- B. B and AB
- C. O only
- D. B only
Which of the following is an example of physiological variation?
- A. Blood groups
- B. Skin colour
- C. Finger prints
- D. Human height
Variation which exhibits a wide range from one extreme to the other with very little difference between the intermediates is described as
- A. phenotypic
- B. discontinuous
- C. continuous
- D. genotypic
Which of the following statements about mutation is true?
- A. The genotype is not affected
- B. The genotype is affected
- C. The phenotype is not affected
- D. It cannot be induced by artificial means
Which of the following is not a means of conservation?
- A. Controlling excessive deforestation
- B. Prevention of poaching
- C. Replacing harvested mature trees with seedlings
- D. Burning of vegetation before cropping
Conservation of wild life is necessary mainly because
- A. wild species cannot resist disease better than their domesticated species
- B. many predator wild animals help in control of pests
- C. many people derive pleasure from observing wild animals
- D. it helps to prevent extinction of species