Plant Biodiversity Flashcards
1
Q
What did plants evolve from?
A
Aquatic algae
2
Q
How many plant species are there
A
250 000
3
Q
What are the 4 major classification divisions of plants
A
- Bryophytes
- Pteridophytes
- Gymnosperms
- Angiosperms
4
Q
What are the key characteristics of plants
A
Presence / absence of…
- vascular tissue
- true leaves and roots
- seeds or spores
- cones or flowers
- fruit
5
Q
What are non vascular plants
A
Plants without a vascular system: xylem and phloem
6
Q
What is a spore
A
A one-celled reproductive unit capable of giving rise to a new individual without sexual fusion
7
Q
What is vascular tissue
A
Xylem and phloem
8
Q
What is the advantage of vascular tissue
A
Adaption that allows the plane to cope in a dry environment
9
Q
What is a true leaf
A
- Organized inside for maximum sunlight
- Dense network of veins
- Waterproof cuticle covering
10
Q
What is a true root
A
- Absorb water and minerals from the soil
- Root hairs
- Efficient absorption
- Plant grows faster and taller
