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Roots, Stems, and Leaves Biology 11

Roots, Stems, and Leaves

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Roots, Stems, and Leaves. Biology 11. Organs Systems. Plants have 4 organ system 3 are vegetative organs Leaf, stem root 1 is reproductive Flower . Roots. Absorb water and dissolved nutrients from soil Anchor plants to ground Hold plant upright. Stems. - PowerPoint PPT Presentation

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Page 1: Roots, Stems, and Leaves

Roots, Stems, and LeavesBiology 11

Page 2: Roots, Stems, and Leaves

Organs SystemsPlants have 4 organ system• 3 are vegetative organs•Leaf, stem root• 1 is reproductive•Flower

Page 3: Roots, Stems, and Leaves

Roots•Absorb water and dissolved nutrients from soil•Anchor plants to ground•Hold plant upright

Page 4: Roots, Stems, and Leaves

Stems•Can be thin and herbaceous or massive and woody•Provide structural support•Water and nutrient transport•Some stems for storage (ex. Potato is a tuber)

Page 5: Roots, Stems, and Leaves

LeavesFunction:• Large surface area for receiving sunlight•photosynthesis takes place in mesophyll

• Covered in waxy cuticle

Page 6: Roots, Stems, and Leaves
Page 7: Roots, Stems, and Leaves

Stomata• Small openings in leaf that open or close•Opening and closing is regulated by guard cells

•Mainly found on the underside of leaves (for land plants)

Page 8: Roots, Stems, and Leaves

• Functions:•Open to take in carbon dioxide and release oxygen and water•Close to decrease water loss

Page 9: Roots, Stems, and Leaves

Vascular TissueXylem•Carries water and dissolved nutrients from roots to stems and leaves•Provides strength •Made of tracheid Cells•Functioning cells are dead

Page 10: Roots, Stems, and Leaves

Phloem• Carry products of

photosynthesis from one part to another

• Main cells are sieve tube elements and companion cells

• Functioning cells are alive

Page 11: Roots, Stems, and Leaves

How Water Moves Up to the Leaves• Root Pressure•Roots absorb water that must move up

• Capillary Action•Water movement opposes gravity in small tubes•adhesion (stick to side of tube) and cohesion (stick to each other) of water molecules

• Transpiration from Leaves • evaporation of water causes the pulling of the

next water molecule up to take place