Oak leaves have a _________ covering on them.

Hairy leaves help trap________.

A kind of leaf that is stiff, thin, and very sharp.

A sharp pointy structure that is a kind of branch or stem.

These are hard, sharp, and pointy, and grow out of the outer covering of a plant stem.

This protects a plant from insects and other animals that may try to eat the soft inner parts of the plant.

Thick bark protects a tree from...

Which image shows a birch tree?

Waxy leaves not only help a plant conserve water, but also make the leaf....

Conifers produce this to protect it from insects.

What do black walnut trees produce in their roots in order to keep other trees from growing nearby?

Which picture shows the plant structure, spines?