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
Lives of organisms in ecosystem become threatened due to
- urbanization
- industrialization
- introduction of toxics in ecosystem
- rapid housing
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
When the heart relaxes,
- person respires
- peristalsis movements occur
- bile is produced
- the heart gets filled with blood
Vertebral column faces the
- concave side of kidneys
- convex side of kidneys
- posterior side of kidneys
- inferior side of the kidney
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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- Receptors which produce sensation of pain are
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- Detection of vibration of ground by terrestrial vertebrates is because of receptors in
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- Skeleton of sponges is composed of needle-like structures called
Causes of Pollution: Biology Practice Tests
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