Micro-organisms are important in recycling nutrients because
- A. they are capable of multiplying quickly
- B. they are eaten by large organisms
- C. they break down dead organic materials
- D. many of them are parasites
Measles in infants can be prevented by
- A. sleeping under mosquito nets
- B. providing clean water supply
- C. taking anti-malaria tablets
- D. vaccinating young children
The numbers in a population would rise, if there was an increase in the
- A. spread of disease
- B. number of deaths
- C. number of predators
- D. amount of food available
The possession of breathing roots is a characteristic of plants growing in
- A. mangrove swamp
- B. coastal savanna
- C. guinea savanna
- D. shrub biome
The concave shape of a birds wing during flight, ensures that the greater air pressure under the wings will
- A. counteract the effect of gravity
- B. lift the bird so that it can remain airborne
- C. enable the pectoral ,muscles to contract easily
- D. change the direction of the flying bird
Which of the following terms ensures the survival of an organism in its environment?
- A. Hibernation
- B. Succession
- C. Adaptation
- D. Competition
The total amount of energy entering a food chain is that which is present in the
- A. consumer
- B. ecosystem
- C. producer
- D. decomposer
Which of the following measures is most likely to cause a damage to the ecosystem in the control of pests
and weeds?
- A. Use of ladybird insects to feed on aphids
- B. introduction of bacterium to kill larvae of butterfly
- C. Introduction of Tilapia fish in ponds to feed on mosquito larvae
- D. Spraying insecticides to destroy cotton- stainers in a cotton-field
In any food chain, the first member must be a
- A. carnivore
- B. herbivore
- C. zooplankton
- D. autotroph
The importance of practising crop-rotation in agriculture is to
- A. control soil erosion
- B. maintain the fertility of the soil
- C. improve the nutritional value of crops
- D. ensure growth of cash crops
Which of the following processes removes water from the water cycle?
- A. Condensation
- B. Perspiration
- C. Photosynthesis
- D. Transpiration
Ecology simply means the study of
- A. the properties of a habitat
- B. interrelationship between organisms and their environment
- C. several species of plants and animals
- D. interrelationship between plants and animals.
Using iodine solution, Biuret test, Benedict reagents and ethanol, respectively in testing for reducing
sugars, which of the following trends of colour changes would be observed?
- A. Blue → black → blue → brown → clear
- B. Brown → blue → brick red → clear
- C. Brown → violet → blue → clear
- D. Brown → blue → violet → milky
The structures labelled II are associated with
- A. storage of plant nutrients
- B. organic acids
- C. nitrogen-fixing bacteria
- D. putrefying microbes
The structures labelled II are
- A. groundnut seeds
- B. underground root nuts
- C. root Tubers
- D. root nodules
Which of the following substances is contained in chloroplasts?
- A. Starch
- B. Sugar
- C. Glycogen
- D. Dextrin
After fertilization in the flowering plants, the zygote develops into the
- A. plumule
- B. radicle
- C. cotyledon
- D. embryo
In flowering plants, fertilization would occur when
- A. the pollen grows downwards penetrating the style
- B. a pollen grain is transferred to the stigma
- C. one of the nuclei inside the pollen tube fuses with the ovum
- D. the nucleus of the pollen tube divides
Which of the following is not an example of entomophilous flower?
- A. Hibiscus
- B. Flamboyant
- C. Guinea grass
- D. AlIamanda
When a person moves from a darkroom into bright light, the pupil becomes
- A. red
- B. larger
- C. white
- D. smaller
The structure of the ear that is responsible for balancing is the
- A. semi-circular carnals
- B. pinna
- C. auditory nerve
- D. fenestra ovalis