IGCSE Biology Paper-3: Specimen Questions with Answers 283 - 286 of 358

Passage

Fig. is a diagram of a fetus in the uterus.

Diagram of a Fetus in the Uterus

Question 283 (3 of 3 Based on Passage)

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Compare the growth and development of the fetus in the early stages of pregnancy with its growth and development in the late stages of pregnancy.

Explanation

Vital Organs

Question 284

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The lower surface of most leaves has many pores.

The pores allow gases to move into and out of a leaf for photosynthesis.

State the name of the gas that is used for photosynthesis.

Explanation

Carbon Dioxide

Oxygen is released during the process of photosynthesis. Photosynthesis is the process in which green plants produce glucose. It involves the conversion of carbon dioxide gas, water, and minerals the plants take in from their surroundings into sugar and gaseous oxygen. Photosynthesis involves the intake of carbon dioxide and the release of oxygen. The release of oxygen is due to photolysis of water.

Question 285

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Lipase is involved in the breakdown of fats.

State the two products of fat digestion.

Explanation

Fatty Acids and Glycerol

Passage

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

Question 286 (1 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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