The Vascular Plant as an The Vascular Plant as an OrganismOrganism

Metabolic ProcessesMetabolic Processes1. Photosynthesis (in chloroplasts)1. Photosynthesis (in chloroplasts)

6CO6CO22 + 6H + 6H22O light CO light C66HH1212OO66 + 6O + 6O22

2. Cellular Respiration (in mitochondria)2. Cellular Respiration (in mitochondria)

CC66HH1212OO66 + 6O + 6O2 2 6CO6CO22 + 6H + 6H22O + 36 ATPO + 36 ATP

A Plant Needs…A Plant Needs…

1. Water: 1. Water:

-Absorbed from the -Absorbed from the soil thru root hairs soil thru root hairs

-Transported thru -Transported thru xylemxylem

-Moves via Diffusion -Moves via Diffusion and Transpiration Pulland Transpiration Pull

2. Minerals:2. Minerals:

-Absorbed with water-Absorbed with water

A Plant Needs…A Plant Needs…

3. CO3. CO22

-Enters leaf thru stomata-Enters leaf thru stomata

-Diffuses into mesophyll -Diffuses into mesophyll

cells and finally into the cells and finally into the chloroplasts.chloroplasts.

4. O4. O22

-Diffuses into mesophyll -Diffuses into mesophyll

cells to cells to

mitochondria.mitochondria.

A Plant Needs…A Plant Needs…

5. To distribute Glucose5. To distribute Glucose

-Diffuses thru phloem -Diffuses thru phloem to all plant cells:to all plant cells:

a) Diffuse into a) Diffuse into mitochondriamitochondria

b) Packed into vacuoles b) Packed into vacuoles by active transport by active transport

(stored as starch)(stored as starch)

What about Non-Vascular Plants?What about Non-Vascular Plants?

Eg. Algae, mosses etc.Eg. Algae, mosses etc. They are small enough They are small enough

that water can diffuse to that water can diffuse to each celleach cell

Every cell does Every cell does photosynthesis, so photosynthesis, so phloem is not needed.phloem is not needed.

Fluid Movement in Fluid Movement in PlantsPlants

Demonstration: Before (6 pm)Demonstration: Before (6 pm)

How does water travel upwards?How does water travel upwards? Water travels up to one meter high via diffusionWater travels up to one meter high via diffusion Beyond one meter – Transpiration Pull is responsibleBeyond one meter – Transpiration Pull is responsible

Transpiration PullTranspiration Pull

Water molecules “crawl” up the wall of the Water molecules “crawl” up the wall of the xylem (adhesion)xylem (adhesion)

Water molecules stick to each other (cohesion)Water molecules stick to each other (cohesion) As each molecule of water evaporates from the As each molecule of water evaporates from the

leaf, it pulls the column of water up the xylem. leaf, it pulls the column of water up the xylem. See diagram!See diagram! Do #1-4, 6, 7, 8, 16, 18 on Page 554Do #1-4, 6, 7, 8, 16, 18 on Page 554