IB DP Biology D4.3 Climate change-FA 2023 IB Style Questions For SL Paper 1

Question

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?

1. 1. Heterotrophs consume more phytoplankton.

   2. Phytoplankton have increased rates of photosynthesis.

   3. Corals deposit less calcium carbonate to form skeletons.

   4. Increased pH reduces enzyme activity in marine organisms.