Note: This past paper question assesses knowledge from other topics alongside the knowledge of the heart assessed in 8.3
Woolly foxglove, Digitalis lanata, shown in Fig. 1A, and common oleander, Nerium oleander, shown in Fig. 1B, are plants grown for the attractive flowers that they produce.
Both plants are poisonous, as their leaves produce toxic organic compounds known as cardiac glycosides. Cardiac glycosides have a powerful effect on the action of cardiac muscle.
Fig. 1
N. oleander is able to grow in very dry conditions. The leaves have adaptations to reduce water loss by transpiration.
State the term used to describe a plant, such as N. oleander, that has adaptations to allow it to grow in conditions where water is in short supply.