Questions: Plant-Herbivore Interactions Plants have a variety of adaptations that discourage animals from eating them. The spines on a cactus and the thorns on a rose stem are examples. Another type of adaptation is producing chemicals that taste bad or are toxic to keep animals away. Underline an example of a mutualism. Choose the correct term from the list for each description. 1. waterproof layer 2. contains a cell that becomes a sperm 3. moves water, nutrients, and sugar through a plant 4. helps a plant stem stand up 5. What evidence makes scientists think that land plants evolved from green algae? 6. What challenges did early plants face living on dry land? 7. Why is it important for some plants to attract animals?

Certainly! Let's address the first three questions from the list provided:

1. Waterproof layer: The correct term for a waterproof layer in plants is "cuticle." The cuticle is a waxy layer that covers the surfaces of leaves and stems, helping to prevent water loss.

2. Contains a cell that becomes a sperm: The correct term for this description is "pollen grain." Pollen grains contain the male gametes (sperm cells) in seed plants and are responsible for fertilization when they reach the female reproductive structures.

3. Moves water, nutrients, and sugar through a plant: The correct term for this function is "vascular tissue." Specifically, xylem moves water and nutrients from the roots to the rest of the plant, while phloem distributes sugars produced by photosynthesis.

In summary, the answers are:

1. Cuticle
2. Pollen grain
3. Vascular tissue