IGCSE Biology Paper-4: Specimen Questions with Answers 25 - 26 of 279

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Question 25

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What is the major problem with world food supplies?

Explanation

World food supplies is related to food security, which means when all people, at all times, have physical and economic access to sufficient, safe, and nutritious food.

However, there are different problems are associated with world food supplies.

  • Some parts of the world produce more than enough food for the people live there and in other parts about enough food or less than enough food produced.
  • Transport related problems
  • Natural causes like weather, flood and drought conditions
  • High rate of human population

Question 26

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Which two light sensitive cells or sensory cells are present on retina of eye?

Explanation

Rods and cones sensory cells located on retina. Rods are very sensitive to low light level and it give black and white vision. Cones can properly works in bright light and mainly found in central part of the retina. The color we see depends on the combination of cones stimulated. Some people are missing one or more type of cone – they have disease of colorblindness.

Image Shows Sensory Cells

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