DP Biology (first assessment 2025)

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Question 22N.1A.HL.TZ0.8

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1A.HL.TZ0.8
Level HL Paper 1A Time zone TZ0
Command term Question number 8 Adapted from N/A
8.
[Maximum mark: 1]
22N.1A.HL.TZ0.8

The action spectra for two different types of photosynthetic organisms are shown. Ulva, or sea lettuce, is a green marine alga composed of two layers of cells. The action spectrum for crop plants was plotted from an average of 22 species of plants.

What describes photosynthesis in these organisms?

A.  Ulva photosynthesizes more than crop plants at red wavelengths.

B.  Crop plants photosynthesize more than Ulva in green light.

C.  Photosynthesis by Ulva is highest in red light while that of crop plants is highest in blue.

D.  Both have zero photosynthesis at 750 nm.

[1]

Markscheme

B

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