IGCSE O Level Biology Practice Test 42

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

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Causes of Pollution: Biology MCQ with Answers PDF Download: Quiz 42

MCQ 206:

Lives of organisms in ecosystem become threatened due to

urbanization
industrialization
introduction of toxics in ecosystem
rapid housing

MCQ 207:

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

tricuspid valve to shut
bicuspid valve to shut
gaseous exchange to effectively take place in lungs
semi lunar valves to prevent backflow of blood

MCQ 208:

When the heart relaxes,

person respires
peristalsis movements occur
bile is produced
the heart gets filled with blood

MCQ 209:

Vertebral column faces the

concave side of kidneys
convex side of kidneys
posterior side of kidneys
inferior side of the kidney

MCQ 210:

At intervals, along the length, the spinal cord

has myelin sheath
has grey matter
gives off spinal nerves
branches off into dendrites

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