IGCSE Biology Paper-4: Specimen Questions with Answers 158 - 161 of 279

Passage

The diagram shows three different types of teeth from a human.

Types of Teeth

Question 158 (1 of 2 Based on Passage)

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State where in the jaw tooth type C is found.

Explanation

Molars teeth are for chewing or crushing the food. The premolars & molars are called cheek teeth and embedded in jaw bone.

Question 159 (2 of 2 Based on Passage)

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Name the types of teeth labelled A and B.

Explanation

Heterodont Teeth Are Present in an Adult Human Being Are 4-Types

  • Incisors: Chisel shaped, for biting or gnawing
  • Canines: Pointed, for tearing flesh.
  • Premolars: For chewing or crushing the food.
  • Molars: For chewing or crushing the food.

The premolars & molars are called cheek teeth.

Types of Teeth

Question 160

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After chemical digestion the products of digestion are absorbed.

Define absorption.

Explanation

Absorption: Ingestion and digestion are the first two phases of the physiological processes occurring in the alimentary tract. The third phase is that of absorption by which the digested nutrients are absorb through the wall of gut into blood.

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 161 (1 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

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