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Biology WAEC Past Questions

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231
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
View Answer & Discuss WAEC 1989
232
Which of the following is not true about a bacterial colony growing on an agar plate?
  • A. They are visible without the aid of the microscope
  • B. Bacterial cells found in one colony often belong to one species
  • C. Different colonies have different colours
  • D. Only one species of bacterial colony can grow on a culture at any time
  • E. Colonies growing on an agar plate under the same conditions must belong to one species
View Answer & Discuss (5) WAEC 1989
233
The theory that new organs or characteristics develop in organisms when there is a need for them was
postulated by
  • A. Charles Darwin
  • B. Jean Lamarck
  • C. Gregor Mendel
  • D. Wallace
  • E. Louis Pasteur
View Answer & Discuss (2) WAEC 1989
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234
Which of the following is an example of reproductive adaptation?
  • A. Succulent stems of cactus plant
  • B. Changing colour of chameleon
  • C. Possession of spines by desert plants
  • D. Neck colouration in Agama lizard
  • E. Leaf-shedding in trees
View Answer & Discuss (1) WAEC 1989
235
The large intercellular air spaces which penetrate the tissues of most hyrophytes provide a pathway through
which
  • A. carbondioxide absorbed by leaves can diffuse to the roots
  • B. oxygen produced in the leaves can diffuse to the submerged parts
  • C. salts absorbed by roots can reach other parts of the plant
  • D. plant hormones are transported to various parts
  • E. manufactured food is translocated
View Answer & Discuss WAEC 1989
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