Land Plant Problems
Plants Invade the Land
Plants invade the Land
Green Algae Land Plants
Kingdom Protista
• Photosynthetic
• Multicellular
• Live in water
Kingdom Plantae
Photosynthetic
Multicellular
Live on land
Problems Land Plants Need to
Solve
1. How to Prevent Dehydration?
Answer = cuticle
waxy covering
Problems Land Plants Need to
Solve
2. How to do Gas Exchange?
(CO2 in, O2 out)
Answer: Stomata*
Guard cell
*Also release
excess water
stoma
Guard cell
Stomata Solve another Problem
Open & close to control water loss
Open
Closed
Problems Land Plants Need to
Solve
3. How to Get Nutrients from Land?
Answer: Roots
Problems Land Plants Need to
Solve
4. How to have Reproduction NOT
dependent on water?
a. Make pollen
(plant sperm
that won’t
dry out)
Problems Land Plants Need to
Solve
4. How to have Reproduction NOT
dependent on water?
b. Find ways to disperse pollen: wind,
insects, birds, small mammals
Problems Land Plants Need to
Solve
4. How to have Reproduction NOT
dependent on water?
c. Keep developing embryo from
drying out with seed coat