Characteristics that exhibit continuous variation are generally controlled by
- A. a single gene
- B. recessive genes
- C. epistatic interactions
- D. multiple genes
Which of the following statement is not a reason for banning bush burning? It
- A. allows for quick regrowth of grasses
- B. Kills soil microorganisms.
- C. leaves the soil bare of vegetation
- D. burns off organic soil nutrients
Which of the following natural resources is non-renewable?
- A. Water
- B. Coal
- C. Forest
- D. Air
Which of the following substances constitute domestic waste?
I Fertilizer II. Insecticides III. Sewage IV. Crude oil
V. Sulphur dioxide
- A. l only
- B. lll only
- C. lV only
- D. ll and V only
l. Fertilizer II. Insecticides III. Sewage IV. Crude oil V. Sulphur dioxide. The atmosphere can polluted by
- A. l only
- B. lll only
- C. lV only
- D. ll and lV only
The following organisms are consumers except
- A. earthworm
- B. spirogyra
- C. bacteria
- D. Rhizopus
Which of the following statements about the circulation of water in nature is not correct? Water
- A. constantly evaporates from seas, rivers, lakes and soil
- B. vapour rises, cools, condenses and precipitates as rain and dew
- C. removed from ocean is permanently lost
- D. is lost in plants by transpiratin and decay
The difference between a community and population is
- A. a community is made up of organisms of the same species while a population is made up of organisms of different species
- B. a community is made up of populations of living organisms while a populations is made up of organisms of the same secies
- C. an ecological niche does not exist in the community but it does in a population
- D. a community attracts competition but a population does not
The following adaptations are associated with the flight of birds except
- A. reduced body weight
- B. streamlined shape
- C. presence of powerful muscles
- D. clawed digits
The following habitats can be found in West Africa except
- A. mangrove swamp
- B. sahel savanna
- C. savanna grassland
- D. temperate grassland
The part of a leguminous plant where bacteria like Azotobacter can be found is
- A. at the nodes of the stem
- B. at the internodes
- C. in the root nodules
- D. in the spongy mesophyll
A characteristic feature of plant parasites is the
- A. possession of holdfast
- B. possession of rhizoids
- C. development of hanging roots
- D. development of haustoria
In a Biuret test , some protein was mixed with sodium hydroxide solution. Which of the following chemicals should be added to the mixture for a positive result?
- A. mercurous nitrate
- B. copper sulphate
- C. sodium carbonate
- D. silver nitrate
A meal consisting of yam and a lot of vegetables is not balanced because it does not contain
- A. carbohydrates
- B. proteins
- C. vitamins
- D. minerals
The purpose of treating poor soil with lime is to increase the quantity of
- A. nitrogen
- B. phosphorus
- C. carbohydrates
- D. sulphur
The amount of starch in a germinating seed decreases because the starch is used up
- A. for respiration and building up of cells
- B. to build cellulose cell wall
- C. to develop meristematic tissues
- D. for the production of enzymes
Older parts of plant roots do not normally absorb water because
- A. they lack xylem
- B. they have small surface area
- C. the phloem is dead
- D. they lack root hairs
An inferior ovary of a flower is situated
- A. below the floral parts
- B. above the floral parts
- C. at the same level with all the floral parts
- D. at the centre of the floral parts
The following substances pass into the blood of the foetus from the mother’s blood via the placenta except
- A. carbon dioxide
- B. glucose
- C. viruses
- D. antibodies
The inability to maintain proper balance of the body in humans may be due to a defect in the
- A. cochlea
- B. Euastachian tube
- C. Semi-circular canals
- D. oval window
Which of the following conditions in flowering plants enhance self-pollination?
- A. Cleistogamy
- B. Heterostyly
- C. Protandry
- D. Protogyny