21. A population is best described as
- A. A group of the same species of organisms living together
- B. A group of animals and plants living together
- C. A group of insects and grasses
- D. Different species of wild animals
22. The number of times an organism occurs within a given area of a habitat is referred to as
- A. Population growth rate
- B. Population frequency
- C. Population growth rate
- D. Population density
23. Reading the verdict of a case by a magistrate is an example of
- A. A reflex action
- B. An instinct
- C. A conditioned reflex
- D. A voluntary action
24. Which of the following structures controls the activities of the living cell?
- A. Nucleus
- B. Centrosome
- C. Mitochondrion
- D. Golgi body
25. Which of the following are components of glomerular filtrate?
- A. All the components of blood except mineral salts
- B. Water and salt only
- C. All the components of blood except plasma protein and cells
- D. Blood cells, amino acid, salts and nitrogenous wastes
26. The sum total of adaptive changes from pre-existing form that have taken place over a long time resulting in diversity of forms, structures and functions among organism is referred to as
- A. Specification
- B. Inorganic Evolution
- C. Evolution
- D. Organic Evolution
27. The specific portion of a habitat which is occupied by a particular species is referred to as
- A. Ecological population
- B. Ecological niche
- C. Biotic community
- D. Ecosystem
28. In plants, respiration occurs in
- A. The stomata and lenticel only
- B. Mesophyll cells only
- C. All living cells
- D. The root only
29. Which of the following is an example of discontinous variation?
- A. The range in height of a pea plant from 30cm to 50cm
- B. Offsprings including two male cats and three female cats
- C. The colour of pear plants grown in the dark
- D. The adult body weight ranging from 50kg to 95kg
30. Which of the following type of soil has the highest water retaining capacity?
- A. Loam
- B. Laterite
- C. Clay
- D. Sand
