IGCSE Biology Paper-4: Specimen Questions with Answers 124 - 126 of 279

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Passage

Fig. is a photomicrograph of part of a cell from the pancreas that produces enzymes that are released into the small intestine.

The Photomicrograph

Question 124 (2 of 2 Based on Passage)

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Structure D is part of the nucleus of the cell.

State one function of a nucleus.

Explanation

Some of the main functions of the nucleus include:

  • Protein synthesis, cell division, and differentiation
  • Control the synthesis of enzymes involved in cellular metabolism
  • Controlling hereditary traits of the organism
  • Store DNA strands, proteins, and RNA
  • Site of RNA transcription - e. g. mRNA required for protein synthesis

Question 125

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Lack of protein in the diet can result in protein-energy malnutrition.

State the name of one disease caused by protein-energy malnutrition.

Explanation

Difference between Kwashiorkor and Marasmus

Passage

Plants produce glucose in leaves and convert some of it to sucrose.

Question 126 (1 of 7 Based on Passage)

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Explain how glucose is produced in leaves.

Explanation

Photosynthesis in plants occurs when a plant gets its energy from light, typically sunlight. Using water and carbon dioxide taken in from the surrounding air, a plant can convert these molecules into glucose and oxygen. The plant then releases oxygen into the air. Glucose, which is a sugar, feeds the plant. There are many uses of glucose in plants. Glucose helps plants grow, form flowers, and develop fruit. It also helps plants develop seeds.

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