IGCSE O Level Biology Practice Test 42

Causes of Pollution: Biology MCQ (Multiple Choice Questions) PDF - 42

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Causes of Pollution: Biology Questions and Answers PDF Download: Quiz 42

MCQ 206: Lives of organisms in ecosystem become threatened due to

A) urbanization

B) industrialization

C) introduction of toxics in ecosystem

D) rapid housing

MCQ 207: Blood in pulmonary arteries is at a lower pressure than blood in aorta allowing

A) tricuspid valve to shut

B) bicuspid valve to shut

C) gaseous exchange to effectively take place in lungs

D) semi lunar valves to prevent backflow of blood

MCQ 208: When the heart relaxes,

A) person respires

B) peristalsis movements occur

C) bile is produced

D) the heart gets filled with blood

MCQ 209: Vertebral column faces the

A) concave side of kidneys

B) convex side of kidneys

C) posterior side of kidneys

D) inferior side of the kidney

MCQ 210: At intervals, along the length, the spinal cord

A) has myelin sheath

B) has grey matter

C) gives off spinal nerves

D) branches off into dendrites

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