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CIE iGCSE Co-Ordinated Science B2.1 Cell structure Exam Style Questions Paper 1

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Question

The diagram shows a plant cell.

Which row names X and describes its function?

▶️ Answer/Explanation
The arrow points to the outermost layer of the plant cell, which is the cell wall. The cell wall is a rigid structure made of cellulose that provides support and maintains the shape of the cell. The cell membrane, located just inside the cell wall, is responsible for controlling the movement of substances in and out. Therefore, row D correctly identifies X as the cell wall and describes its function as maintaining cell shape.
✅ Answer: (D)

Question

Which diagram shows a cell adapted to transport oxygen around the body?

▶️ Answer/Explanation
Red blood cells are adapted for oxygen transport. They have a biconcave disc shape which increases their surface area for oxygen diffusion. They also lack a nucleus, leaving more space for haemoglobin, the protein that binds to oxygen. Looking at the diagrams, Diagram C shows a red blood cell with its distinctive biconcave shape and no nucleus, which is the correct identification of a cell adapted for oxygen transport.
✅ Answer: (C)

Question

The diagram shows part of the breathing system in humans.

Which cell type makes up part of structure X?

A. ciliated
B. gamete
C. palisade mesophyll
D. phloem

▶️ Answer/Explanation
Structure X is the trachea (windpipe), which is lined with ciliated epithelial cells.
The cilia beat to move mucus and trapped particles upwards.
Gametes are reproductive cells, palisade mesophyll is found in leaves, and phloem is a plant tissue.
✅ Answer: (A)

Question

Which part of a plant cell allows the movement of substances into and out of the cell?

A. cell membrane
B. cell wall
C. nucleus
D. vacuole

▶️ Answer/Explanation
The cell membrane is a partially permeable barrier that controls the movement of substances into and out of the cell. The cell wall is fully permeable and only provides structural support, while the nucleus contains genetic material and the vacuole stores cell sap.
✅ Answer: (A)

Question

Which statements about cell structure are correct?

  1. Animal cells have cell membranes but no cell walls.
  2. Animal cells have cell membranes and cell walls.
  3. Plant cells have cell walls but no cell membranes.
  4. Plant cells have cell membranes and cell walls.

A. 1 and 3
B. 1 and 4
C. 2 and 3
D. 2 and 4

▶️ Answer/Explanation
Animal cells only have a cell membrane and never have a cell wall, so statement 1 is correct and statement 2 is wrong.
Plant cells have both a cell wall and a cell membrane (the membrane lies just inside the wall), so statement 3 is wrong and statement 4 is correct.
The correct pair of true statements is therefore 1 and 4.
✅ Answer: (B)
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