DP Biology (first assessment 2025)

Test builder »

Question 20N.1A.SL.TZ0.19

Select a Test
Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.1A.SL.TZ0.19
Level SL Paper 1A Time zone TZ0
Command term Question number 19 Adapted from N/A
19.
[Maximum mark: 1]
20N.1A.SL.TZ0.19

The oceans absorb much of the carbon dioxide in the atmosphere. The combustion of fossil fuels has increased carbon dioxide ocean concentrations. What adverse effect does this have on marine life?

A. Heterotrophs consume more phytoplankton.

B. Phytoplankton have increased rates of photosynthesis.

C. Corals deposit less calcium carbonate to form skeletons.

D. Increased pH reduces enzyme activity in marine organisms.

[1]

Markscheme

C

Syllabus sections