Commonly confused

C4 plants vs CAM plants

The tell

C4 plants separate carbon fixation in space, from mesophyll to bundle sheath. CAM plants separate it in time, opening stomata at night. Both pay extra ATP — the drought tax.

Pairs like this are where exam points go missing — the concepts are fine, the labels swap. Retrieval fixes it faster than rereading: the daily quiz mixes confusable pairs into every set.

Today’s daily quiz All confusable pairs