Multiple ChoiceThe shoot system of a prickly pear cactus consists of broad paddle-like structures covered with clusters of spines. The spines are modified leaves, so the flat green paddles must be modified versions of what structure? 2views
Multiple ChoiceWhich of the following is the correct arrangement of structures from the inside to the outside of a leaf blade? 2views
Multiple ChoiceA cross section of a plant part exposes epidermis, a thick cortex, and a central cylinder of xylem and phloem. This part is a __________. 1views
Multiple ChoiceLeaves occur at intervals along the plant stem. What is the region where a leaf is attached to the stem? 2views