Cambridge IGCSE · Marine Science (0697)

Photosynthesis: Practice Questions

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

10 questions24 marksFree, no account

Question 1

1 mark

Which of the following best describes the process of photosynthesis?

Question 2

1 mark

Which group of marine organisms primarily performs photosynthesis?

Question 3

1 mark

A marine scientist observes a decrease in the biomass of phytoplankton in a specific coastal area. Which of the following environmental changes would most likely explain this observation?

Question 4

1 mark

Which substance is produced and subsequently released as a vital by-product during photosynthesis in marine producers?

Question 5

1 mark

Certain marine protoctists, such as diatoms and dinoflagellates, are vital primary producers. What cellular component enables them to carry out this role?

Question 6

2 marks

What is the primary function of chlorophyll in photosynthetic organisms?

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Question 7

3 marks

Explain why a local upwelling event in a coastal marine ecosystem typically leads to a significant increase in the productivity of primary producers.

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Question 8

5 marks

A student investigates the effect of light intensity on the rate of photosynthesis in a macroalga. Explain why controlling other environmental factors is crucial for obtaining valid results.

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Question 9

4 marks

Describe the process of photosynthesis, highlighting its significance as the foundation of marine food webs.

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Question 10

5 marks

(a) State the word equation for photosynthesis.
(b) Explain why microscopic phytoplankton are considered crucial primary producers in the open ocean and discuss their contribution to the global oxygen supply.

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