IGCSE Biology Paper-3: Specimen Questions with Answers 287 - 288 of 358

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Passage

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

Question 287 (2 of 4 Based on Passage)

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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

Question 288 (3 of 4 Based on Passage)

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State one reason, other than food production, why the human population has increased so rapidly between 1910 and 2010.

Explanation

Improved health care, beginning in the 1960՚s, is one of the leading causes of the increased growth rates that created the population explosion.

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