1. Plant Organs and their Structure & Function

2. Structure

3. PLANT CIRCULATION AND RESPIRATION
Water and dissolved minerals enter a plant's roots from the soil by means of diffusion and osmosis.
These substances then travel upward in the plant in xylem vessels.
Transpiration creates a pull from above, as lost water molecules are replaced with new ones

4. Water is lost through stomata. Stomata are small openings in the leaf.
STRUCTURES
Water is lost through stomata. Stomata are small openings in the leaf.
Stomata have guard cells, which open and close to let water and gases through.

5. Carbohydrates, produced in leaves by photosynthesis, travel downward in plants in specialized tissue called PHLOEM.
Water pressure forces these substances from cell to cell, back down to the rest of the plant
Circulatory System - Circulation In Vascular Plants - Water, Travel, Phloem, Cell, and Substances

6. Plant Tissues Meristematic Tissue
Function: division of new cells for growth or repair
Form:
Apical meristems are located at root and shoot tips and are directly involved in their elongation
--plants protect their meristems with young leaves, buds, and root caps

7. Plant Tissues… Meristermatic
Lateral meristem are
responsible for horizontal
expansion
3. Intercalary meristem
helps regenerate parts
removed by lawnmowers,
herbivores, etc

8. Plant Tissues Ground Tissue
Function: bulk of plant tissue; store starch, photosynthesis and respiration, physical support
Form:
1. Parenchyma
Large spherical cells for
storage and cell processes

9. Plant Tissues Ground Tissue Form cont’d: 2. Collenchyma
Elongated, flexible cells just
beneath surface to support growth
3. Sclerenchyma
Thick, nonflexible dead cells
form shells of nuts and grittiness of pears
Structural support
Thick cell walls of sclerenchyma

10. Plant Tissues Dermal Tissue Function:
protection from dehydration and bacteria, nutrient absorption
Form: single layer of cells
Root Hairs—increase surface
area for absorbing water

11. Plant Tissues - Dermal 2. Leaf Hairs (Trichomes)
Reflects light, breaks wind
currents, traps humidity, barbs
to deter insects
3. Stomata underneath leaves
allow CO2 in and H20 out
4. Salt glands removes excess salt

12. Plant Tissues Vascular Tissue Function: movement of fluids/food
and physical support
Form:
Xylem
dead, hollow cells; have a large diameter, so water movement through them is rapid

13. Plant Tissues - Vascular
Phloem
tube cells with pores at ends
transports dissolved sugars
from leaves to rest of plant

14. DEMO

16. Plant Reproduction: Flowers

17. Questions about Plant Reproduction
What is the role of the petals in reproduction?
Protects reproductive parts of flower
Attracts Pollenators
What is the purpose of fruit that develops in flowering plants?
It is the ovary of the plant. Provides nutrients and protects seeds.