IGCSE Biology Paper-4: Specimen Questions with Answers 162 - 163 of 279

Passage

Drugs such as heroin restrict the movement of impulses across synapses. Users can become addicted to heroin. When users stop taking heroin, they may experience withdrawal symptoms.

Question 162 (2 of 2 Based on Passage)

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State two withdrawal symptoms that heroin users may experience.

Explanation

Common Symptoms of Withdrawal Include

  • Nausea and vomiting
  • Insomnia

  • Agitation

  • Diarrhea

  • Dilated pupils

  • Sweating

  • Anxiety

  • Abdominal cramping

  • Muscle aches

Passage

Carbon dioxide is a greenhouse gas.

Question 163 (1 of 2 Based on Passage)

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Explain how carbon dioxide enhances the greenhouse effect.

Explanation

Sun gives out UV, infrared and visible radiation gets received by the earth. The incoming solar energy from the sun is redirected back towards space by the atmosphere and clouds and then some of the solar energy gets absorbed by the atmosphere and clouds. And the remaining energy gets absorbed by the Earth’s surface making it warm. This energy then gets converted into heat. Now once this heat gets absorbed by the earth’s surface, it is trapped in the earth’s atmosphere and thereby adding to increase the earth’s temperature. This effect is what we call the ‘Greenhouse Effect. ’ Therefore, if the amount of greenhouse gases present in the earth’s atmosphere is high then the earth’s temperature too will keep getting higher; which is what has been happening lately adding to the greenhouse effect and warming up earth than it already is. Extreme weather conditions, global warming, and rise in sea levels are the results of the greenhouse effect.

The Greenhouse Effect