G10 Biology IGCSE

Which of the table below shows the correct chambers of the heart, from those with the thinnest walls to those with the thickest?

• A

• B

• C

• D

The diagram below shows a vertical section through a human heart. Which row of the following table has the correct names for the structures labeled in the diagram?

• X-atrioventricular valve, Y-semilunar valve, Z- Septum

• X-Semilunar valve, Y-Atrioventricular valve, Z- Septum

• X- semilunar valve, Y-semilunar valve, Z- Atrioventricular valve

• X-atrioventricular valve, Y-atrioventricular valve, Z- Septum

The image below shows a cross-section of a blood vessel taken from an arm. Which type of blood vessels is shown in the image, and in which direction will blood flow?

• Capillary / flows from S to T / low oxygenated blood

• Vein / flows from T to S / High oxygenated blood

• Artery / flows from S to T / High oxygenated blood

• Vein / flows from T to S / low oxygenated blood

Some components of the blood of a mammal are shown in the image below. Which row of the table has the correct cells from the image above assigned to their names?

• 4-lymphocyte, 2-phagocyte, 3- platelets

• 2-lymphocyte, 4-phagocyte, 3- platelets

• 1-lymphocyte, 2-phagocyte, 1- platelets

• 2-lymphocyte, 4-phagocyte, 1- platelets

Four different stages in one heartbeat are shown in the diagram below. Which of the following depicts the correct order of stages?

• W→X→Y→Z

• X→Z→Y→W

• W→Y→Z→X

• X→W→Y→Z

Which of the following depicts the correct order of stages in the formation of a blood clot?

• soluble fibrin → insoluble fibrinogen → blood clot

• soluble fibrinogen → insoluble fibrin → blood clot

• insoluble fibrin → soluble fibrinogen → blood clot

• insoluble fibrinogen → soluble fibrin → blood clot

What makes the alveoli suitable as a gas exchange surface in mammals?

• A

• B

• C

• D

Some amphibians, such as frogs, can use their skin as a gas exchange surface. what are the most likely characteristics of the surface of the skin in these amphibians?

• A

• B

• C

• D

When the diaphragm relaxes and internal intercostal muscles contract, how does the volume and pressure inside the thorax change? points: 3

• A

• B

• C

• D

The diagram shows the composition of four samples of air (O₂ = oxygen, CO₂ = carbon dioxide, N₂ = nitrogen). Which sample is inspired air and which sample is expired air?

• inspired air- R,

  expired air - S

• inspired air- P,

  expired air - R

• inspired air- Q,

  expired air - P

• inspired air- S,

  expired air - R