Cambridge IGCSE · Marine Science (0697)

Cell structure and function: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Cell structure and function.

10 questions25 marksFree, no account

Question 1

1 mark

Which cellular structure is common to all marine organisms, including animals, plants, and bacteria?

Question 2

1 mark

What is a key structural feature of a marine bacterial cell that distinguishes it from a typical marine animal or plant cell?

Question 3

1 mark

How does the presence of a cell wall in marine plants, such as seagrass, provide a survival advantage when the salinity of the surrounding sea water changes?

Question 4

1 mark

Which cellular organelle is characteristic of marine photosynthetic organisms like microalgae and macroalgae, and is essential for converting light energy into glucose?

Question 5

1 mark

Which statement accurately describes the cell boundary structures in a typical marine animal cell compared to a marine plant cell?

Question 6

2 marks

Identify the cellular organelle responsible for storing water, nutrients, and waste products in a marine plant cell.

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Question 7

3 marks

Compare the main difference in cell wall presence between a typical marine plant cell and an animal cell.

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Question 8

5 marks

Explain why a macroalga growing at the bottom of the sunlight zone might have a higher density of chloroplasts in its cells compared to an individual of the same species growing in shallow rock pools.

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Question 9

5 marks

Marine plant cells and marine animal cells share some common structures but also possess distinct differences.

(a) Identify two cellular structures found in a typical marine plant cell that are not present in a typical marine animal cell.
(b) Describe the primary function of the cell membrane in both marine plant and animal cells.
(c) Name one structure that is found in both marine plant and animal cells and state its function in energy production.

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Question 10

5 marks

Microscopes are essential tools for marine biologists to observe tiny organisms like diatoms and dinoflagellates.
(a) State the formula used to calculate magnification using the terms image size and actual size.
(b) A student captures a micrograph of a marine cell. The image size of the cell is \(60 \text{ mm}\) and the actual size of the cell is \(0.012 \text{ mm}\).
Calculate the magnification used. Show your working.
(c) State the actual size of the cell in micrometers (\(\mu\text{m}\)). (Note: \(1 \text{ mm} = 1000 \mu\text{m}\)).

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