IGCSE Biology Paper-3: Specimen Questions with Answers 288 - 289 of 358

Passage

Improved food production has contributed to the increase in the human population.

Question 288 (3 of 4 Based on Passage)

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Short Answer▾

State and explain two ways in which modern technology has resulted in increased food production.

Explanation

  • Development and use of chemical fertilizers on farm land to boots levels of nutrients in the soil, increasing crop yields.
  • Development and use of pesticides such as insecticides and fungicides to kill pests that feed on it and damage crops thus increase crop yields.
  • Development and use of herbicides to kill weeds that compete with crops for nutrients, light, water, and space thus increase crop yields.

Question 289 (4 of 4 Based on Passage)

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One Liner▾

In view of the increasing human population, people are sometimes encouraged to eat less meat and more fruit and vegetables, to improve the energy efficiency of their food supply.

Explain why eating less meat and more fruit and vegetables is more energy efficient.

Explanation

One of the benefits of a vegetarian diet is a reduction in our impact on the environment. Animals store only a small fraction of the energy they extract from the food they eat, and the rest is wasted as heat. If we eat animal as foods, most of the energy in the plants those animals ate has been lost as heat and only a fraction of it reaches to us. Eating plants is more efficient, meaning that less of the energy the plants contain is wasted. Ultimately, this means that less land is required to support a population of vegetarians.

Energy Inputs Per Produced Food