Which of the following organelles are likely to be present in cells that are actively respiring and
hotosynthesizing?
- A. Nucleoli and centrioles
- B. Lysosomers and ribosomes
- C. Endoplasmic reticulum and Golgi bodies
- D. Chloroplasts and mitochondria
- E. Food vacuoles and contractile vacuoles
The scientist who discovered the honey-comb structure of the cell was
- A. Robert Hooke
- B. Felix Dujardin
- C. Mathias Schleiden
- D. Theodore Schowann
- E. Louis Pasteur
The autonomic nervous system comprises
- A. sympathetic and parasympathetic systems
- B. cranial and sacral nerves
- C. brain and cranial nerves
- D. spinal cord and spinal nerves
- E. brain and spinal nerves
Over-crowding in seedlings of different species is less serious than over-crowding involving one species
because different species may
- A. have different nutritional needs
- B. lack the same nutrient
- C. be active at the same time
- D. have similar tolerance
- E. need equal spacing
The term afforestation is used in describing
- A. harvesting of natural forest resources
- B. planting trees of value to man
- C. fallowing of forestland
- D. felling of trees in the forest
- E. recycling of waste forest products.
The inability of some individuals to perceive the taste of some substances is an example of
- A. individual adaptation
- B. physiological variation
- C. morphological variation
- D. morphological adaptation
- E. physical variation
The spaces between neutrones through which impulses cross by means of chemical reaction are called
- A. axons
- B. ganglia
- C. synapses
- D. dendrites
- E. pia mater
Which of the following fixes atmospheric nitrogen?
- A. Rhizobium
- B. Nitrosomonas
- C. Nitrobacter
- D. Putrefying bacteria
- E. Denitrifying bacteria
Group instinct or social behaviour is not displayed in
- A. soldier ants
- B. bees
- C. chickens
- D. weaver birds
- E. termites
One of the methods of preventing measles is by
- A. sleeping under mosquito net
- B. attacking the vectors
- C. attacking the secondary host
- D. vaccinating young children
- E. providing clean water supply
Which of the following effects would desertification have on the
ecological balance represented in the diagram above? The calorific
value’ of the energy
- A. . 10 x 104k cal obtained from the sun would decrease
- B. 10 x 104k cal obtained from the sun would increase
- C. 6 x 104k cal obtained at level I would increase
- D. 1 x 104k cal obtained at level V would increase
- E. 3.5x 104k cal obtained at level II would increase
What phenomenon in ecosystem does the diagram illustrate?
- A. Pyramid of numbers
- B. Food web among organisms
- C. Pyramid of energy
- D. Pyramid of biomass
- E. Evolutionary trend in organisms
The similarity between the bone structure of the arm of a human and the fore-limb of a
rabbit indicates
- A. adaptive radiation
- B. continuous variation
- C. a common origin
- D. convergent evolution
- E. adaptation to the same environment
The evidence for evolution can be obtained from the following except
- A. fossil
- B. anatomy
- C. history
- D. embryology
- E. taxonomy.
What is the name given to the structure labelled A at this stage of cell division
- A. Chromatin
- B. Centrtomere
- C. Chromatid
- D. Gene
- E. Daughter-chromosome
What stage is illustrated by the diagram?
- A. lnterphase
- B. Prophase
- C. Metaphase
- D. Anaphase
- E. Telophase
All hereditary characters in a cell are passed on from parent-cell to daughter-cell through the process of
- A. mitosis
- B. meiosis
- C. fertilization
- D. implantation
- E. gestation
Which of the following represents the phenotypic ratio, when a plant Rr is crossed with another plant Rr,
assuming that the gene R for round seed is dominant and wrinkled r is recessive?
- A. 1:2:1
- B. 2:2:1
- C. 3:2
- D. 3:1
- E. 4:1
At which of the following stages of cell division can the cell be said to be resting
- A. Anaphase
- B. Telophase
- C. Prophase
- D. interphase
- E. Metaphase
Breathing roots are characteristic structures of plants growing in
- A. mangrove swamp
- B. desert
- C. shrub biome
- D. savannah
- E. tropical rain forest
The term used in describing the effective management of national resources by man is
- A. preservation
- B. utilization
- C. economics
- D. development
- E. conservation