The drugs which inhibit the growth of disease-causing organisms and thus used in the treatment* of infections are
referred to as
- A. antibodies
- B. antibiotics
- C. antitoxic
- D. septics
If a piece of abandoned farmland went through a series of floral and faunal changes and became established with
permanent plant and animal population, it could be said to have undergone
- A. transformation
- B. succession
- C. competition
- D. evolution
Which of the following methods is best for the determination of population density of Tridax in an open held?
- A. transect
- B. quadrat
- C. Sweep-net
- D. pit-fall
When a farmer sprays crops with a pesticide, the pesticide becomes
- A. poisonous to all plants
- B. is broken down by soil algae
- C. easily washed down into lakes and rivers
- D. absorbed by bodies of mammals
Plants found in the aquatic habitat are generally referred to as
- A. epiphytes
- B. halophytes
- C. xerophytes
- D. hydrophytes
Which of the following defines symbiosis?
- A. parasites feed on dead organisms
- B. both organisms benefit mutually by living together
- C. Saprophytes feed on living organisms
- D. organisms serve as host to parasite
Which of the following features enables the tapeworm to live successfully in the small intestine of human?
- A. Hook and suckers for strong attachment
- B. Along neck for forming young proglottis
- C. The absence of segmentation and appendages
- D. Possession of flame cells for excretion
The continuity of an ecosystem depends on constant flow
of energy and circulation of matter. However,
the amount of energy passed on from decomposers to
producers should be
- A. great
- B. small
- C. reversible
- D. zero
An importance of food web is that living organisms
- A. use web to collect food
- B. can live on their own
- C. have to form a web
- D. depend on one another for their existence
Which of the following are consumers in these food chains?
- A. maize and rabbits
- B. chicken, rats and maize
- C. eagle, maize and snakes
- D. humans, eagle and snakes
Conservation of soil fertility employs crop rotation because
- A. crops are allowed to grow at their own rates
- B. it encourages the healthy growth of plants
- C. it allows utilization of soil nutrients at different levels
- D. different crops grow at the same time
Which of the following is not essential in the studying of the ecological factors that directly affect plants?
- A. wind
- B. temperature
- C. herbivores
- D. carnivores
Biosphere is best described as
- A. all parts of the earth where life exists
- B. the non-living parts of an ecosystem
- C. a components of an ecosystem
- D. all the members of a single species in a habitat
Which of the following teeth are well-developed to form the carnassial teeth of carnivorous mammals? The
- A. first lower premolar and third upper molar
- B. first lower molar and third upper premolar
- C. second lower premolar and first lower molar
- D. first lower molar and last upper premolar
The break-down of food in o simple, soluble and absorbable end-products is termed
- A. absorption
- B. ingestion
- C. nutrition
- D. digestion
An organism is considered a heterotroph when it
- A. feeds on inorganic food
- B. feeds on already manufactured food
- C. fixes atmospheric nitrogen
- D. respires anaerobically
The deficiency of vitamin D and calcium ions in the diet of a human causes
- A. anaemia
- B. night-blindness
- C. kwashiokor
- D. rickets
Which of the following is not true about a potted plant left in the laboratory for one week without watering?
- A. the cells of the plant will be turgid
- B. there will be wilting of the plant
- C. the leaves are likely to tum yellow
- D. plant will not take in enough nutrients
The deficiency of manganese in plants results in?
- A. death of shoot
- B. leaves turning yellow
- C. stunted growth
- D. poor root development
A solution which contains all the required elements in their correct proportions is known as a
- A. culture nutrient
- B. growth medium
- C. complete culture solution
- D. nutrient solution
Which of the following groups contains only macro-nutrients?
- A. phosphorus, nitrogen and molybdenum
- B. manganese, copper and zinc
- C. boron, sulphur and iron
- D. calcium, magnesium and potassium