IGCSE Biology Paper-3: Specimen Questions with Answers 282 - 284 of 358

Passage

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

Diagram of a Fetus in the Uterus

Question 282 (2 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 283 (3 of 3 Based on Passage)

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Describe the process of Let Down reflex in human female.

Explanation

  • The mammary glands of the female undergo differentiation during pregnancy and starts producing milk towards the end of pregnancy by the process called lactation.
  • This helps the mother in feeding the new- born.

  • The milk produced during the initial few days of lactation is called colostrum which contains several antibodies essential to develop resistance for the new-born babies.

  • Breast-feeding during the initial period of infant growth is recommended by doctors for bringing up a healthy baby.

Let down Reflex

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.