The parameters of size, height, weight and colour in a population of living things are examples of
- A. environmental variation
- B. non-heritable variations
- C. continuous variations
- D. discontinuous variations
Which of the following is an example of variation?
- A. Blood
- B. Tongue rolling
- C. Reproduction
- D. Growth
The main reason for the conservation of wildlife is to
- A. create national parks for recreation
- B. maintain ecological balance in communities
- C. prevent hunters from being 'cruel to animals
- D. save some species from extinction.
The following effects are associated with deforestation except
- A. gully erosion
- B. extinction of plant species
- C. migration of wildlife
- D. increase in rainfall
In a population, food shortage may lead to
- A. an increased survival rate
- B. high reproduction rate
- C. intra-specific competition
- D. low rate of migration
Muscles are attached to bones by means of
- A. tendons
- B. ligaments
- C. cartilage
- D. nerves
Rural-urban migration in developing countries can be prevented by
- A. increasing the number of years in school
- B. putting up more factories in urban areas
- C. having boarding schools in rural areas
- D. even distribution of facilities in both regions
The following are greenhouse gases except
- A. carbon dioxide
- B. chlorofluorocarbon
- C. methane
- D. oxygen
Which of the following factors is the main problem facing xerophytic plants?
- A. Competition for sunlight
- B. Conservation of excess water
- C. inadequate roots for water absorption
- D. Lack of adequate water
A moss plant can withstand drought by means of its
- A. spores
- B. rhizoids
- C. antheridia
- D. achegonia
Which of the following is a biotic component of an ecosystem?
- A. Soil
- B. Rainfall
- C. Light
- D. Fungi
The speed of wind is measured using the
- A. wind vane
- B. anemometer
- C. photometer
- D. barometer
The distribution of organisms in a fresh water habitat like a stream or pond is determined by the following
factors except
- A. light penetration
- B. pH of the soil
- C. rainfall
- D. temperature
In a particular habitat the role of an organism is referred to as its
- A. level
- B. biomass
- C. niche
- D. space
An herbivore cannot feed on a piece of meat because it has no
- A. incisors to out the meat
- B. canines to tear up the meat
- C. premolars to grind the meat
- D. molars to mash the meat
The bacterium in a mutualistic association with legumes converts
- A. nitrates to ammonia
- B. ammonium compounds to nitrites
- C. nitrogen gas to ammonia
- D. nitrites to nitrates
Which of the following pH values is the best for the action of the enzymes – renin and pepsin in the
stomach?
- A. pH2
- B. pH7
- C. pH8
- D. pH9
Which of the following food substances is incorrectly linked to its enzyme?
- A. Protein - trypsin
- B. Fat - lipase
- C. Sucrose - pepsin
- D. Starch - amylase
In testing for starch in a leaf, the leaf is first boiled in water for about a minute so that the
- A. cell walls are hardened
- B. cells are killed
- C. chlorophyll is dissolved out
- D. iodine will penetrate
A man suffering from obesity must avoid meals containing
- A. margarine and butter
- B. rice and beans
- C. carrots and oranges
- D. beef and fish
In which of the following organic compounds is the hydrogen-oxygen ratio equal to 2:1?
- A. Proteins
- B. Carbohydrates
- C. Lipids
- D. Vitamins