Recall that leaves form in distinct arrangements (whorled, opposite or alternate) on the stems of vascular plants. How might chemical factors secreted by neighboring structures cause new leaves to form in these particular patterns?

Question

Select all correct choices.
A. Leaf primordia secrete chemical inhibitors
that prevent the formation of leaves nearby.
B. Leaf primordia secrete chemical activators
that promote the formation of leaves nearby.
C. Mature leaves secrete chemical inhibitors
that prevent the formation of leaves nearby.
D. Mature leaves secrete chemical activators
that promote the formation of leaves nearby.

Answer 1

A