Evolution of plants (Plants)

Question 1

age of earth

Answer 1

5 billion years

Question 2

age of life

Answer 2

4 billion years

Question 3

age of oldest fossils

Answer 3

3.5 billion years

Question 4

first 3.6 billion years of life

Answer 4

confined to sea and water
land was completely barren
highly speculated why it took so long for land to become inhabited

Question 5

theory for why it took so long for land to become habitable

Answer 5

photosynthetic organisms in sea hadn’t produced enough O2 to form ozone layer

Question 6

ozone layer

Answer 6

essential to filtering out UV rays and radiation from the sun
organisms could grow on land once there was an ozone layer

Question 7

development of the ozone layer

Answer 7

took a long time

evolution caused simple algae to mutate and adapt into much more complicated organisms

Question 8

2 evolutionary lines of plants

Answer 8

1. non-vascular

2. vascular

Question 9

vascular plants

Answer 9

have specialized cells for transporting H2O and food

more adapted and complex than non-vascular

Question 10

non-vascular plants

Answer 10

no vascular tissue

Question 11

phylogenic tree for plants

Answer 11

1. algae -> moss and vascular plants
2. vascular plants -> ferns and seed plants
3. seed plants -> conifers and angiosperms

Question 12

seed plants

Answer 12

could survive better than fern-like plants

Question 13

gymnosperms

Answer 13

naked seeds

Question 14

angiosperms

Answer 14

flowers

survive better because seeds are protected