1. Video on medicine and plants
4 plants that are great for humans
The effect of seed plants on human welfare
Video on Study.com

2. Chapter 21 Plant structure and function
21.1 Plant cells and tissues

3. Plant tissue Plant tissues are made up of three basic cell types:
1.) Parenchyma cells
2.) Collenchyma cells
3.) Sclerenchyma

4. Parenchyma cells Most common type of plant cell
Stores starch, oil, and water for the plant
Found throughout the plant
Cells have thin walls and large water filled vacuoles in the middle
Photosynthesis occurs in chloroplasts within parenchyma cells in the leaves
Have the ability to divide throughout life span. Important for healing damage and regenerating parts

6. Collenchyma cells Cells range from thin to thick
Provide support while still allowing plant to grow
Most common in younger tissues of leaves and roots
Often form strands…. Celery strings are strands of collenchyma
Flexible and cells do not contain lignin
Cells are stretchy and can change size

8. Sclerenchyma cells Strong cells
These cells have a secondary wall that is hardened by lignin
Very tough and durable
So rigid they cannot grow with the plant
Found in plant parts that are not lengthening anymore
Most die when they reach maturity
Form the major part of fruit pits and outer shell of nuts
Gritty texture of pears are do to sclerenchyma cells

10. Tissue Systems 1.) dermal tissue 2.) ground tissue 3.) vascular tissue
Just as three plant cells, there are three plant tissues
1.) dermal tissue
2.) ground tissue
3.) vascular tissue
Plasmodesmata: strands of cytoplasm that pass through openings in cell walls and connect living tissue.
*cells share water, nutrients, & chemical
Signals through plasmodesmata

12. Tissue systems
Dermal tissue: covers the outside of the plant and provides protection.
Also known as epidermis
Made up of live parenchyma cells in the non-woody parts
On the leaves and stems – secretes wax that becomes the cuticle
Dermal tissue made of dead parenchyma cells – outer bark of wood plants

14. Tissue systems
Ground tissue: surrounded by dermal tissue and makes up much of the inside of a plant
provides support and stores material in roots and stems
In leaves: packed with chloroplast for photosynthesis
Contains all three types of plant cells but parenchyma is by far the most common ground tissue

16. Tissue systems
Vascular tissue: Surrounded by ground tissue, the system transports water, minerals, nutrients, and organic compounds to all parts of the plant
Xylem: carries water and dissolved minerals
Phloem: carries food from photosynthesis through out the plant