Download From Cell to Seed p. 134-‐138 1. List 4 things plants do for us. 2.

November 04, 2014
From Cell to Seed p. 134-­‐138
1. List 4 things plants do for us. oxygen, food, medicine, materials
2. Each of the events involved the appearance of ______________.
3. From what type of organism did plants evolve?
single celled organism that first lived in ancient seas and resembled
modern prokaryotes (bacteria).
4. Why couldn’t plants and animals survive 3.5 BYA ? little to no oxygen
5. What trait was an advantage to have because of compeKKon for primiKve food sources?
ability to use Sulfur compounds, CO 2,
and energy from the sun to
make food
6. What substance was abundant at this Kme? Water
7. How did oxygen increase in the atmosphere?
cells that used H 2 O, CO2, and sun to make food released oxygen as
waste (photosynthesis).
8. What is the composiKon of ozone? three atoms of oxygen (O) 3
9. What did the ozone layer make possible? Explain.
It helped organisms live on land because it protects them from UV ray
exposure which can damage their DNA.
10. How did eukaryotes gain the ability to go through photosynthesis?
They incorporated photosynthetic bacteria within their cell.
11. Why would a mulK-­‐celled organism have a beTer chance of survival on land
than a single celled organism?
Outer layer of cell protected inner layer from drying out. Some of the
cells may have been specialized to collect H 2O.
12. Name 2 traits of plants that help them retain water.
waxy coating on leaves, vascular system to transport water
13. How did plants adapt to reproduce without water?
had a protective structure like a cone or flower. Used seeds.
14. What are two benefits to seeds?
helps with wide dispersal and protection of embryo from drying out.