iGCSE Edexcel Biology: Blood Quiz

What are the components of blood?

• Proteins, carbohydrates, and lipids

• Nucleus, cytoplasm, and cell membrane

• Hemoglobin, oxygen, and carbon dioxide

• Red blood cells, white blood cells, platelets, and plasma

Answer explanation

Blood is composed of red blood cells, white blood cells, platelets, and plasma. These components play vital roles in oxygen transport, immune response, and clotting.

Isabelle, Elsie, and William are on a field trip to a science museum. They come across an exhibit about the human body. A guide explains that red blood cells have a specific function in our body. What is the main function of red blood cells that the guide might have explained?

• They help in digesting the food we eat

• They are responsible for producing antibodies

• They are involved in transporting oxygen

• They play a role in regulating our body temperature

Answer explanation

Red blood cells are involved in transporting oxygen.

How is oxygen transported in the blood?

• Attaching to white blood cells

• Transported by platelets

• Dissolving in plasma

• Binding to hemoglobin molecules in red blood cells

Answer explanation

Oxygen is transported in the blood by binding to hemoglobin molecules in red blood cells.

What is the role of haemoglobin in red blood cells?

• Haemoglobin is responsible for maintaining blood pressure.

• Haemoglobin helps in the production of white blood cells.

• Haemoglobin is involved in the digestion of food.

• Haemoglobin carries oxygen .

Answer explanation

Haemoglobin carries oxygen in red blood cells.

Aarav is studying the human circulatory system and wonders about the adaptations of red blood cells for efficient oxygen transport. What are these adaptations?

• Biconcave shape, flexible membrane, lack of nucleus

• Biconcave shape, rigid membrane, presence of nucleus

• Flat shape, rigid membrane, lack of nucleus

• Spherical shape, rigid membrane, presence of nucleus

Answer explanation

The adaptations of red blood cells for efficient oxygen transport include biconcave shape, flexible membrane, and lack of nucleus.

Amelia accidentally cut her finger while cooking. How do platelets in her blood help in clotting?

• Platelets play a role in fighting infections.

• Platelets form a plug and release chemicals that promote clotting.

• Platelets are responsible for maintaining blood pressure.

• Platelets help transport oxygen in the blood.

Answer explanation

Platelets form a plug and release chemicals that promote clotting.