Which of the following is a function of the chromosome?
- A. Transmission of hereditary traits
- B. Protein synthesis
- C. Excretion
- D. Energy production
- E. Manufacture of enzyme
Which of the following diseases or disorders can be prevented by the application of the knowledge of heredity through marriage counseling ?
- A. Sickle cell anaemia
- B. Haemophilia
- C. Diabetes mellitus
- D. Colour blindness
- E. River blindness
The offspring produced when pure strains interbreed is descried as
- A. dominance
- B. phenotype
- C. allele
- D. genotype
- E. hybrid
Identical twins inherit their genes from
- A. the same ovum and different sperms
- B. the same sperm and different ova
- C. different sperms and many ova
- D. the same ovum and the same sperm
- E. many ova and many sperms
One of the major criticisms against Mendelian laws is that they do not recognise that
- A. one trait is often controlled by many pairs of genes
- B. single factor inheritance is never a reality
- C. complete dominance is always possible
- D. incomplete dominance is not possible
- E. hybrids exist in living organisms
One of the factors that must be considered for sate blood transfusion is
- A. social class of the donor
- B. age of the recipient
- C. rhesus factors of the donor and the recipient
- D. nationality of the donor
- E. weight of the recipient
The table below indicates the result of an experiment during which grains of different colours in two maize cobs were counted
Maize Cob Colours of Maize Grains
White Pink Red
l. 30 60 30
II. 50 99 49
Which of the following ratios agrees with the result?
- A. 9:3:3
- B. 1:2:1
- C. 1:3:1
- D. 2:1:1
- E. 2:3:2
The largest game reserve in Nigeria is the
- A. Kainji Game Reserve in Niger State
- B. Zamfara Forest Reserve in Sokoto State
- C. Yankari Game Reserve in Bauchi State
- D. Borgu Game Reserve in Niger State
- E. Oban Hills Game Reserve in Cross River State
The following agencies are responsible for conservation in Nigeria except
- A. Forestry Department
- B. Nigerian Conservation Society
- C. Games Reserve Authority
- D. Nigerian Red Cross Society
- E. Ministry of Agriculture and Natural Resources
Which of the following is the underling principle in the adoption of biological control of pests?
- A. Knowledge of agricultural practices by the farmer
- B. relationship between plants and animals
- C. the presence of poisonous chemicals in the farm
- D. the relative population of plants and animals in the farm
- E. The predator-prey relationship in the ecological community
Which of the following substances cannot control the growth of harmful microoganisms?
- A. Antibiotics
- B. Hypertonic salt solution
- C. disinfectants
- D. isotonic sugar solution
- E. Antiseptics
The use of predators or parasites to control pests in the farm is known as
- A. predator control
- B. chemical control
- C. biological control
- D. animal control
- E. parasitic control
Which of the following is not a characteristic of overcrowding in plant and animal community?
- A. Population outstripping available space
- B. Population exceeding available food
- C. Competition within the population
- D. increase in primary production
- E. population increasing at the same rate as the bith rate
A climax community is characterised by
- A. a stable composition of plant and animal species
- B. rapid changes in the composition of species
- C. constant changes in appearance of the habitat
- D. different species occurring at different times
- E. gradual change in animal population
Which of the following is not an adaptation of plants or animals to desert environment?
- A. Well developed tap root system
- B. Small leaves with thick epidermis
- C. Stems with spike-like leaves
- D. Metabolic waste in the form of uric acid in some animals
- E. broad leaves for storage
Which of the following is not an adaptation of plants or animals to desert environment?
- A. Well developed tap root system
- B. small leaves with thick epidermis
- C. Stems with spike-like leaves
- D. Metabolic waste in the form of uric acid in some animals
- E. Broad leaves for storage
In which of the following processes is carbondioxide not given out?
- A. respiration in plants
- B. decay of organism
- C. burning of organic matter
- D. burning of fuels
- E. during photosynthesis
Which of the following explains the term pyramid of numbers?
- A. the number of organisms in a trophic level
- B. the relationship between plants in different trophic levels
- C. the number of saprophytes and parasites in a habitat
- D. the number of predators in a habitat
- E. progressive decrease in the number of individuals from lower to higher trophic level
The following are features of Northern Guinea Savanna except
- A. presence of tall trees with thick bark
- B. bare soil with very few trees
- C. presence of fire-resistant trees
- D. abundant herbivores
- E. predominance of woody trees
The following are features of the tropical rain forest except
- A. abundant water supply
- B. loose and moist soil
- C. short trees growing benealth tall trees
- D. scanty trees with small leaves
- E. presence of many animals
Which of the following best describes a marine habitat?
- A. large body of water
- B. which has no distinctive color or taste
- C. with high concentration of salt
- D. with little suspended materials
- E. with no water weed