Bece Past Questions & Answers -2016 ( Science)

21. Which of the following plants has its leaves modified for storing food?
A. Ginger
B. Onion
C. Pineapple
D. Tomato

22. Gases enter and leave the leaf of a plant through the
A. mesophyll cells
B. stomata
C. pith
D. palisade cells

23. Which of the following vegetable crops is cultivated for its leaves?
A. Carrrot
B. Lettuce
C. Okro
D. Pepper

24. An example of a body that does not produce its own light is the
A. moon
B. sun
C. star
D. fire fly

25. Which of the following devices converts electrical energy into sound energy?
A. Electric heater
B. Electric fan
C. Washing machine
D. Loudspeaker

26. Transplanting of young seedlings is usually done in the evening because
A. darkness promotes rapid growth
B. seedlings require less nutrients
C. pest attack is minimal
D. transpiration is minimal

27. A mixture of sugar and water could be separated by
A. decantation
B. evaporation
C. filtration
D. sublimation

28. Which of the following processes results in the formation of new substances?
A. Cooling water to form ice
B. Adding saliva to cooked yam
C. Dissolving sugar in water
D. Mixing iron dust and sand

29. Photosynthesis is important to living organisms because it produces
A. glucose and oxygen
B. glucose and carbon dioxide
C. oxygen and carbon dioxide
D. water and carbon dioxide

30. Global warming is caused by the
A. circulation of oxygen in the atmosphere
B. excessive release of carbon dioxide into the atmosphere
C. release of hydrogen into the atmosphere
D. circulation of nitrogen in the atmosphere