The gland which produces trypsin, amylase and lipase is labeled?
- A. 6
- B. 4
- C. 2
- D. 1
In the digestive system, absorption of nutrient into the blood takes place in the part labeled?
- A. 1
- B. 2
- C. 3
- D. 4
As the tadpole develops, the structure labelled 5
- A. grows longer
- B. becomes shorter
- C. becomes the hind legs
- D. remains unchanged
The structure labelled 4 is for
- A. feeding
- B. attachment
- C. excretion
- D. respiration
Nitrogen- fixing micro-organisms in leguminous plants live symbiotically in the
- A. root nodules
- B. tap root
- C. branch roots
- D. root hairs
Fertilizers are lost from the soil through
- A. sheet erosion and evaporation
- B. leaching, underground seepages and run-off
- C. sheet erosion, gully erosion and wind erosion
- D. wind erosion and heavy rainfall
Sources of air pollutants are
- A. industrial chimneys, burning fossil oils and river dam
- B. sulphur dioxide, acid rain and pesticides
- C. sulphur mines, vehicle exhausts and aerosols
- D. sewage, smoke and old vehicle
Which of the following diseases can be prevented by innoculation?
- A. Syphilis
- B. Malaria fever
- C. Tuberculosis
- D. Acquired Immune Deficiency Syndrom
Which of these is NOT an adaptive features for arboreal life?
- A. Possession of long tail
- B. Possession of claws
- C. Possession of teeths
- D. counter shading in coat colour
Which of the following is likely to occur in a deciduous forest during the dry season?
- A. New leaves are formed
- B. The trees die off
- C. The undergrowth increases
- D. The ground becomes bare
A food web is more stable than a food chain because
- A. it contains more organisms
- B. it has greater energy source
- C. it is not easy to destroy
- D. every organism has an alternative source
The above diagram represents a competitive interaction between organism in communities I and II. Which of the following statements is CORRECT?
- A. The population of I was higher than II at the beginning of the experiments
- B. II was wiped out from the enviroment at the end of the experiments
- C. The population of II was always lower than that of
- D. The population of I was lower at the end of the experiment than at the beginning
Organisms in an ecosystem are usually grouped according to their trophic level as
- A. carnivores and epiphytes
- B. consumers and parasites
- C. producers and consumers
- D. producers and saprophytes
The most important factors which influence an organism’s way of life in its habitat are
- A. the physicals and biotic enviroment
- B. Food and water availability
- C. temperature, water, light and predator-prey relationship
- D. competition for food and spaces
Which of the following characters is NOT sex-linked?
- A. River blindness
- B. Baldness
- C. Haemophilia
- D. Colour blindness
When two heterozygotes mate, the dominant trait will appear in
- A. the F1 generation only
- B. the F2 generation only
- C. both the F1 and F2 generations
- D. neither the F1 nor F2 generation
The exchange of genes between homologous chromosomes is called
- A. test cross
- B. back cross
- C. crossing-over
- D. mutation
The greatest contribution to genetic studies was made by
- A. Thomas Morgan
- B. Gregor Mendel
- C. Charles Darwin
- D. Robert Hooke
A dwarf plant can be stimulated to grow to normal height by the application of
- A. thyroxin
- B. gibberellin
- C. insulin
- D. kinin
Epigeal germination can be found in
- A. sorghum
- B. maize
- C. millet
- D. groundnut
Vegetation propagation is described as asexual reproduction because
- A. reproductive organs are not involved
- B. new individuals are not formed
- C. many new plants are produced
- D. there is no exchange of genetic materials