The role of dead organic matter in the soil is to
- A. make the soil black
- B. increase the mineral salt content
- C. provide food for all living organisms
- D. increase the acidity of soil
- E. make the soil more porous
Which of the following is the unit of transmission of hereditary traits in living organisms
- A. Nucleus
- B. Nucleolus
- C. Gametes
- D. Genes
- E. Chromosomes
which of the following will be the effect of waterlogged top soil on the roots of plants?
- A. the waterlogged soil will stimulate rapid growth of roots
- B. there will be abundant supply of air for the growth of roots
- C. The roots will absorb water i rapidly
- D. There willl be an accumulation of plant nutrients
- E. the roots will be starved of air
The number of individuals in a habitat in relation to the unit space available to each organism is referred to as the
- A. birth rate
- B. density
- C. mortality
- D. frequency
- E. dispersion
fewer number of trees is characteristic of the Savanna zones of Nigeria because
- A. there is too much sunlight
- B. there is limited amount of rainfall
- C. they are usually exposed to grazing animals
- D. they are covered by high mountains
- E. the farmers always engage in bush-burning
Which of the following would be the primary producer in a food chain?
- A. Saprophytes
- B. Herbivores
- C. Carnivores
- D. Green plants
- E. Parasites
Puddles,ponds, rivers, lakes, seas and ocean are grouped together as
- A. ecosystem
- B. biosphere
- C. terrestrial habitat
- D. marine habitat
- E. aquatic habitat
The female part of a flower consist of the
- A. stigma, style and ovary
- B. petals, sepals and anthers
- C. stigma, sepals and anthers
- D. filaments, style and pollen grain
- E. sepals, stigma and pollen grain
Natality is a factor affecting population density because it involves
- A. increase in population due to immigration
- B. increase in population due to emigration
- C. the number of mature females in the population
- D. the number of females in the population
- E. the number of all young ones produced in the population
The part of the alimentary system of a bird where grinding of maize occurs is the
- A. crop
- B. stomach
- C. gizzard
- D. cloaca
- E. rectum
Which of the following adapts the aorta to the high pressure of the blood from the heart?
- A. Thin walls
- B. Fragile membrane
- C. Thick elastic walls
- D. stiff walls
- E. Narrow lumen
In testing for a reducing sugar, the food substance is usually warmed with
- A. sulphuric acid
- B. million's reagent
- C. sudan III
- D. Benedicts's solution
Pellagra can be prevented by taking food rich in?
- A. vitamin A
- B. vitamin B
- C. Vitamin D
- D. calcium
- E. iodine
During which of the following processes is food for animals produced?
- A. Photosynthesis
- B. Respiration
- C. Nutrition
- D. Digestion
- E. Transportation
The bicuspid valve is located between
- A. left auricle and left ventricle
- B. right auricle and right ventricle
- C. left and right ventricle
- D. left and right auricle
- E. left auricle and right ventricle
Which of the following is not seen in the transverse section of a young monocotyledonous stem?
- A. Parenchyma
- B. Phloem
- C. Xylem
- D. Cambium
- E. Sclerenchyma
Which of the following substance from the mother’s blood diffuse through the placenta into the blood vessels of the feotus?
- A. Carbon dioxide and oxygen
- B. Glycogen and starch
- C. Urea and carbon dioxide
- D. Glucose and oxygen
- E. Digested food and carbon dioxide
Which of the following is not part of the female reproductive system?
- A. Ovary
- B. Seminal vessicles
- C. Uterus
- D. Vagina
- E. Fallopian tube
Which part of the ear is responsible for the maintenance of balance?
- A. Ossicles
- B. Tympanic membrane
- C. Eustachian tube
- D. semicircular canals
- E. Cochlea
The part of the brain responsible for the control the controls of voluntary movement and interpretation of sensation is the
- A. cerebrum
- B. cerebellum
- C. optic lobe
- D. medulla oblongata
- E. olfactory lobe
The human skin is regarded as a sense organ because it
- A. separates the body from the outside world
- B. protects the body from cold and heat
- C. regulates the water content of the body
- D. has an outer layer of dead cells
- E. has nerve endings