IGCSE Biology Paper-1: Specimen Questions with Answers 112 - 113 of 208

Question 112

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Question

MCQ▾

The photograph shows human blood cells as seen under a microscope at high power.

Which are Red Cells?

Which Are Red Cells?

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Which are red cells?

Choices

Choice (4)
a.R and Q
b.Only R
c.P and Q
d.Only Q

Answer

b.

Explanation

A blood smear is a sample of blood that’s tested on a specially treated slide. For a blood smear test, a laboratory professional examines the slide under a microscope and looks at the size, shape, and number of different types of blood cells. These include:

  • Red blood cells, which carry oxygen from your lungs to the rest of your body
  • White blood cells, which fight infection
  • Platelets, which help your blood to clot
Blood Cells

Blood Cells

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Question 113

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MCQ▾

The table shows the percentage of carbohydrates, fat, and proteins in four (A-D) samples of food.

Which sample has the highest energy content?

Which sample has the highest energy content? Which sample has the highest energy content?
carbohydrates%fats%proteins%
A16772
B85516
C323823
D59518

Choices

Choice (4)
a.D
b.B
c.A
d.C

Answer

a.

Explanation

  • Fats are complex molecules composed of fatty acids and glycerol. The body needs fats for growth and energy. It also uses them to synthesize hormones and other substances needed for the body’s activities (such as prostaglandins).
  • Fats are the slowest source of energy but the most energy-efficient form of food. Each gram of fat supplies the body with about 9 calories, more than twice that supplied by proteins or carbohydrates. Because fats are such an efficient form of energy, the body stores any excess energy as fat. The body deposits excess fat in the abdomen (omental fat) and under the skin (subcutaneous fat) to use when it needs more energy. The body may also deposit excess fat in blood vessels and within organs, where it can block blood flow and damage organs, often causing serious disorders.