A researcher applies a treatment to bean leaves during daylight. After the treatment, both carbon dioxide uptake and water loss from the leaves decrease.
Which statement explains these observations?
The palisade cells contain fewer chloroplasts
The guard cells have closed the stomata
The guard cells have opened the stomata
The waxy cuticle has become thicker
74 exam-style questions on AQA GCSE Biology 2.3 Plant tissues, organs and systems, covering 2.3.1 Plant tissues and 2.3.2 Plant organ system. Each one has a worked solution and a mark scheme showing where the marks go.