Lecture 14 Flashcards Preview

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Flashcards in Lecture 14 Deck (18):
1

Evidence for Charophyte Sister Arrangement

1. Cellulose - synthesizing rights
2. Peroxisome enzymes
3. flagellated sperm
4. Phragmoplast
5. Genetic Data

2

Land Plants

multicellular eukaryote that is often photosynthetic

3

Land Plants differ from other organisms:

- apical meristem
- life cycle with alternation of multicellulrar
- thick-walled spores that grow into haploid plants

4

Apical Meristem

s found at the apices, or tips of the plant, both the tip of the shoot and the root and is a region of actively dividing cells

5

Place evolutionary innovations into a logical sequence:
-Vascular Tissues
-Flowers
-Chloroplasts
-Think-walled spores
-photosynthesis
-seeds
-fruits

Photosynthesis
Chloroplasts
Think-walled spores
Vascular Tissues
Seeds
Flowers
Fruits

6

Anatomy of a Plant

Cells --> Tissues --> Tissue Systems --> Organs

7

Three Tissue Systems

Dermal
Ground
Vascular

8

Basic Plant Growth

Indeterminate growth
Cell division localized in meristems
Development "fate" determined immediately after mitosis

9

Challenges of Land

Gravity
-various adaptations
Desiccation and Gas exchange
-many adaptations
-stoma: pores on stems and leaves
Cell communication
plasmodesmata - pores between cells
Sexual Reproduction
-alternation of multicellular generations

10

Plasmodesmata

pores between cells

11

stoma

pores on stems and leaves

12

Counteract Gravity

body support

13

Plant Support

rigid cell walls
steems
woody tissue layers

14

Diffusion

tendency to move down a concentration gradient

15

Semi-permeable membrane

water moves passively, solutes generally do not

16

Cohesive

stick together
-surface tension

17

Adhesive

stick together hydro

18

Transpiration

trade off
Gain CO2 for photosynthesis, get rid of excess CO2