IGCSE Biology Paper-1: Specimen Questions with Answers 198 - 199 of 208

Question 198

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Question

MCQ▾

Erythroblastosis fetalis occurs when

Choices

Choice (4)
a.Mother is Rh negative, and father is Rh positive
b.Father is Rh negative, and mother is Rh positive
c.None of the above
d.All of the above

Answer

a.

Explanation

Erythroblastosis fetalis is also known as erythroblastosis neonatorum. It is hemolytic anemia in the fetus. It is caused when either Rh positive mother has the Rh-negative baby or Rh-negative mother has Rh positive baby. Baby’s Rh antigens will be perceived as foreign and mother’s body produces antibody against the Rh-negative antigen and attacks the blood cells of the baby which results in anemia. It is also caused due to incompatible blood group. When a mother with an O blood type gives birth to a baby who has an A, B, or AB blood type. Because O blood types have both A and B antibodies, the mother’s blood can attack the baby’s blood cells.

Question 199

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Question

MCQ▾

The graphs show the quantities of selected vitamins and mineral ions in four foods.

Transport of Oxygen by the Blood

Transport of Oxygen by the Blood

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Which food is the richest source of the vitamin or mineral ions essential for the transport of oxygen by the blood?

Choices

Choice (4)
a.Fish
b.Fruit
c.Bean
d.Egg

Answer

d.

Explanation

Fish

  • Fish is a good source of 9 out of 14 essential vitamins.
  • These include Vitamins A, B1, B2, B3, B5, B6, B12, D, and E. Among all fish Tuna and Trout provide the most vitamins but be sure to eat a wide variety of fish for a healthy diet.

Eggs

  • Eggs are a good source of 4 out of 14 essential vitamins.
  • These include Vitamins B2, B5, B12, and D.

Beans

High in vitamins B1, and B9

Fruits

  • Bananas are high in vitamin B6
  • Berries are high in vitamin C
  • Citrus fruits are high in vitamin C