Which of the following is not an effect of overcrowding on a population?
- A. Death
- B. Competition
- C. Commensalism
- D. Aggression
- E. Cannibalism
Maize is best stored against insect attack
- A. on raised platforms
- B. in fumigated silos
- C. in a sunny area
- D. while still on the cob
- E. in humid metal tanks
Which of the following methods is used in food preservation for a long period?
- A. adding oil to food
- B. Exposing food to fresh air
- C. keeping the food in a store
- D. Warming the food daily
- E. Salting and drying the food
Which of the following. groups of organisms feeds directly on green plants?
- A. Producer
- B. Decomposer
- C. Primary consumer
- D. Secondary consumer
- E. Tertiary consumer
The activities of an organism which affect the survival of another organism in a habitat can be described as
- A. biotic factors
- B. climatic factors
- C. physiographic factors
- D. edaphic factors
- E. abiotic factors
Pests can be controlled without the subsequent danger of polluting the ecosystem by
- A. introducing a population of species similar to that of the pest
- B. increasing the population of the natural enemies of the pest
- C. eliminating the natural enemies of the pest
- D. keeping the population of natural enemies of the pest constant
- E. spraying the ecosystem with pesticide
Which of the following statements is not correct about the ecological effects of agricultural activities?
- A. The use of herbicides and pesticides in farms can cause pollution
- B. Bush-burning encourages desertification
- C. Excessive use of fertilizers in farms may have harmful effects
- D. Tillage of tropical soils with ploughs and harrows may encourage erosion
- E. Monocropping is one of the cultural methods of controlling pests.
Which of the following characteristics is associated with commensalism?
- A. Both organisms are harmful to each other
- B. The association involves many organisms
- C. The association is beneficial to one of the organisms
- D. Both species are beneficial to each other
- E. This relationship is found only among higher plants
Which of the following statements is not correct about food chains?
- A. All food chains start with a green plant
- B. Food chains involve feeding relationships among organisms
- C. horter food chains indicate more effective utilization of energy than longer ones
- D. There is no energy loss in a food chain
- E. All food chains have primary consumers.
An association between living organisms in which one lives on and feeds at the expense of the other
organism is known as
- A. parasitism
- B. commensalism
- C. mutualism
- D. symbiosis
- E. predation
The translocation of food materials in plants takes place in the
- A. xylem
- B. cambium
- C. phloem
- D. parenchyma
- E. sclerenchyma
A dehiscent fruit formed from several fused carpels with many seeds is classified as
- A. an achene
- B. a capsule
- C. a follicle
- D. a legume
- E. a nut
Which of the following is not an adaptation of the small intestine for absorption of digested food? The
- A. villi are well supplied with blood and lymph vessels
- B. villi are numerous and thin-walled
- C. small intestine has large surface area
- D. small intestine is long and coiled
- E. small intestine leads into the large intestine
In photosynthesis, the following processes are part of the light reaction
except
- A. transfer of radiant energy which reduces a co-factor
- B. absorption of radiant energy by chlorophyll
- C. utilization of the energy in the electron transfer chain to form ATP
- D. formation of glucose using energy from NADPH
- E. splitting of water into its component parts.
Autotrophs are also described as
- A. consumers
- B. decomposers
- C. carnivores
- D. producers
- E. herbivores
The aqueous humour is represented by the part labelled
- A. I
- B. II
- C. III
- D. VI
- E. VII
The greatest concentration of light receptors is found in the part labelled
- A. VI
- B. V
- C. IV
- D. III
- E. I
The light – sensitive layer is labelled
- A. I
- B. III
- C. IV
- D. VI
- E. VII
Which of the following organisms is at the tissue level of organization?
- A. Euglena
- B. Paramecium
- C. Volvox
- D. Hydra
- E. Chlamydomonas.
The bone that articulates with the part labelled III is the
- A. humerus
- B. femur
- C. tibia
- D. sacrum
- E. fibula
The part labelled I is the
- A. lumbar
- B. sacrum
- C. ilium
- D. pubis
- E. coccyx