"It's not easy being green."
- Kermit, the Frog
Until about 500 million years ago, the life on this planet was almost purely aquatic. Photosynthetic organisms covered the world's oceans while the land remained a desolate, barren wasteland. In those early days of life's history on Earth, it was hard to imagine that one day the land would be covered in living organisms. The first multicellular plants most likely came from green algae which teamed up with a fungus, similarly to how lichen survives today. This symbiotic relationship continues to be a popular way to move energy through the ecosystem, as four-fifths of modern plants have fungal partners (called mycorrhizae), on their roots.
Plants provide nearly all of the food that supports terrestrial life. They are now the dominant feature of land life. The angiosperms, or flowering plants, are the most diverse with more than 275,000 species.
Go to the following website: The Plant Kingdom
Go through the slide show about the plant kingdom.
Answer the following questions:
1. What does mycorrhizal fungi do for plants?
2. What are the main characteristics of plants?
3. What is xylem and phloem?
4. What is fruit?
5. Why is an angiosperm more complex than other plants?
6. What is your favorite plant and why?