Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall...

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Plant Cells and Tissues Chapter 23.1

Transcript of Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall...

Page 1: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Plant Cells and Tissues

Chapter 23.1

Page 3: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Plant Tissues

• There are four types of tissues in plants:– Dermal tissue– Vascular tissue– Ground tissue– Meristematic tissue

Page 4: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Dermal Tissue• Also called the epidermis

• Composed of flattened cells

• Protects and covers the body of the plant

• Produces the cuticle

Page 5: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Located in the Epidermal Layer…

• Stomata:– Opening in leaf tissue– Help control water loss from plant

• Guard Cells:– Controls the opening/closing of stomata

• Trichomes:– Hairlike projections on stem and leaf– Reduces evaporation of water from plant

Page 6: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Vascular Tissue

• Main function is to transport water, food throughout plant

• Two types of vascular tissue– Xylem– Phloem

Page 7: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Xylem

• Transports water from roots to plant

• Composed of tracheids– Tubular cells tapered

at each end

Page 8: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Phloem

• Transports sugars to all parts of the plant

• Made up of tubular cells joined end to end

Page 9: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Ground Tissue

• In charge of photosynthesis, storage, and secretion

• Found throughout plant

Page 10: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Meristematic Tissue• Produces most of a

plant’s new cells• Located in regions of

actively dividing cells

Page 11: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Roots, Stems, and Leaves

Chapter 23.2

Page 12: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Roots

• Anchor, absorb nutrients, contain vascular tissue to transport materials

• Can be short or long, thick or thin

• Have root hairs– Tiny extensions – Increase surface area of root

Page 13: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Stems• Support leaves and flowers, contains

vascular tissue to transport materials• Arrangement of vascular tissue:

– Monocots: Xylem and phloem scattered throughout stem

– Dicots: Xylem and phloem in a circle that form a ring

Page 14: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Growth of Stem

• Primary growth– Increase in length

• Secondary growth– Increase in diameter

Ex: Woody Stem:

Page 15: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Leaves

• Primary function: Photosynthesis• Some leaves joined directly to stem

– Example: grass blade

• In some leaves, a stalk called a petiole joins the leaf blade to the stem

• Simple leaf– Blade that is not divided

• Compound leaf– Blade divided into leaflets

Page 16: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

• Transpiration:– Loss of water through

the stomata

• Leaf venation:– Patterns of veins in the

leaves• Parallel• Pinnate• Palmate

Page 17: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Plant Responses

Chapter 23.3

Page 18: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Plant Hormones

• Plants have hormones that regulate growth and development

• Auxins and Gibberellins (2 hormones) that promote growth in plants

Page 19: Plant Cells and Tissues Chapter 23.1. Plants are composed of cells which contain: –Cell wall –Central vacuole –Chloroplasts.

Plant Responses

• Why do stems grow up and roots grow down?

• Tropism– Plant’s response to an external stimulus

• Phototropism– Plant growth toward light

• Gravitropism– Plant growth in response to gravity