What are plant hormones?

What are pneumatophores? How do they help the plant? Name an example.

Give an example of a plant hormone that promotes growth.

In a wheat field, some broad leaved weeds were seen by a farmer. Which plant hormone would you suggest to get rid of them?

What is plant anatomy?

State the function of the following : Plant hormones.

What is the least concentration of an element that could be detected in plants, using modern techniques.