Which of the following statements is not a reason for conserving wildlife?
- A. Attraction of tourists into the country
- B. Serving as a source of food
- C. Serving as a source of income
- D. increasing the amount of rainfall
Which of the following human activities would help prevent endangered species from extinction?
- A. Uncontrolled killing of species
- B. Regular clearing of the forest vegetation
- C. Temporary maintenance of species in zoological gardens
- D. Regular irrigation of their natural habitats
The absence of alimentary canal in the parasitic flatworm can be attributed to the fact that
- A. its body does not feed
- B. it has no enzymes
- C. its body absorbs digested food
- D. it has suckers on the scolex
The following organisms are pests of plants except
- A. birds
- B. nematodes
- C. bacteria
- D. rodents
Ascaris lumbricoides is a parasitic
- A. flat worm
- B. round worm
- C. arthropod
- D. elastic worm
Rhizobium which lives in the root nodules of leguminous plants is an example of the association known as
- A. commensalism
- B. epiphytism
- C. mutualism
- D. saprophytism
The main reason for immunizing children is to
- A. destroy pathogens in their bodies
- B. increase the production of white blood cells
- C. stimulate the production of antibodies
- D. simulate the production of antigens
A pyramid of numbers is constructed by
- A. comparing living and non-living things
- B. measuring productivity
- C. conducting census
- D. labelling the living organisms
The bacteria that reduce nitrates in the soil into gaseous nitrogen are referred to as
- A. nitrifying bacteria
- B. denitrifying bacteria
- C. putrefying bacteria
- D. saprophytic bacteria
The frog is considered a better swimmer than the toad because it
- A. has more pronounced webbed digits
- B. has much longer and stronger hind limbs
- C. lives in water most of the time
- D. is more streamlined than the toad
The producers in a food chain in an aquatic environment are
- A. birds
- B. phytoplankton
- C. zooplankton
- D. fishes
The maximum size of a population that a given area can support is known as
- A. population density
- B. carrying capacity
- C. population growth
- D. maximum population
Ecology simply means the study of
- A. particular species of plants and animals
- B. the interrelationship between orgganisms and their environment
- C. the properties of a habitat
- D. the interrelationship between plants and animals
Which of the following associations is an example of epiphytism?
- A. Lice in the human hair
- B. Mistletoe on citus fruit.
- C. Egret on cow
- D. Fern on palm tree
Which of the following substances is not complex carbohydrate?
- A. Glycogen
- B. Cellulose
- C. Starch
- D. Glucose
The correct arrangement of food classes of the same quantity in the order of magnitude of energy value in animals in descending order is
- A. Carbohydrates, fats and oils, water, protein
- B. Fats and oils, carbohydrates, protein, water
- C. Water, fats and oils, carbohydrates, protein
- D. Protein, fats and oils water and carbohydrates
The name of the enzyme that catalyses the conversion of glucose to glucose-6-phosphate at the beginning of glycolysis is
- A. phospho-fructokinase
- B. glucose isomerase
- C. hexokinase
- D. glucose-6-kinase
Which of the following factors is likely to increase the rate of transpiration in plants?
- A. A reduction in the number of stomata per unit surface area
- B. Increase in humidity around the leaves of plants
- C. An increase in leaf surface area to volume ratio
- D. Removal of leaves from plant
Conduction of water and mineral salts through the xylem vessels is enhanced because the xylem cells are
- A. thickened with lignin
- B. long, narrow tubes placed end to end
- C. close to the endodermis
- D. centrally placed in the roots
The process by which plants manufacture food from carbon dioxide and water using energy from the sun is called
- A. chemosynthesis
- B. photosynthesis
- C. anabolism
- D. catabolism
The resolution of a microscope refers to its power to
- A. increase an object's apparent size
- B. distinguish clearly between two objects
- C. scan the surface of an object
- D. focus on an object