Plants

Ch 2

The student will:

• Learn what photosynthesis is and how it helps plants.

• Learn what a plant needs for photosynthesis.

Plants #1• Question – What happens to the Oxygen

produced during photosynthesis?• Hypothesis – I think the Oxygen______

______________________________. Procedure:

-Materials: Elodea plant (water plant), test tube, water, plastic cintainer

1. Place plant in water under test tube2. Observe for 1 week

Time Observations

1 day

2 days

5 days

11total

• Conclusion- I thought ______________. I learned ______________________. I think this because _________________ ____________________(talk about what you observed). I still wonder ___________________________ ____________________________.

What is photosynthesis?• Plants make their own food. This

process is called photosynthesis.

Photosynthesis sing along

What is needed for photosynthesis to occur?

• Light is needed for photosynthesis to occur. The plant’s leaves use the light to make a sugar called glucose.

Why do plants need glucose?

• Glucose is the food for the plant. It gives the plant energy to grow.

How much glucose does a plant make?

• Plants make enough glucose to be used during the night and on cloudy days when they don’t get sunlight. The extra glucose is stored in the plant’s leaves and other parts.

How does photosynthesis help us?

• During the process of photosynthesis, oxygen is produced. We use this oxygen to breathe.

Photosynthesis

Carbon Dioxide

Sunlight(Energy)

Water

Chloroplast*Chlorophyll inside grana

absorbs energy in sunlight

Glucose(Food)

Oxygen

Photosynthesis Song

Where does photosynthesis occur?

• Photosynthesis occurs in the leaves of a plant.

• Many chloroplasts found here

• Simple Leaves

• Compound Leaves

Inside a Leaf

Leaves

PartsEpidermis – outer layer (skin)

Stomata – small openings on the bottom (mouths). Open during day and close at night to let gases in and out

Veins – long thin tubes that transport water and materials

Kinds•Simple – one blade

•Compound – many blades

Processes• Photosynthesis

•Chloroplasts mostly found here

Vocabulary• Chlorophyll

• Chloroplast

• Grana

• Photosynthesis

• Stomata

Carbon and Oxygen Cycles

• Plants use Carbon Dioxide and give off Oxygen• People and animals use Oxygen and give off Carbon

Dioxide• The cycle balances the amount of Oxygen and Carbon in

the air. It also recycles the air.• People are upsetting the balance by polluting the air (car

exhaust) and cutting down trees (deforestation)

Carbon and Oxygen Cycles

Vascular Tissues

• Roots• Stems • Leaves

Nonvascular Plants

Physical Characteristics•Always small

•Flat, close to water source

•Moss, liverwort, hornwort

Parts•No transport structures

•No roots

•No stem

•No leaves

How nutrients move•Absorbs water and minerals

(diffusion)

Vascular Plants

Physical Characteristics•Small to really large

•Specialized parts and organs

•Palm trees, bushes, daisies

Parts•Roots – keeps plant in ground and absorbs water and minierals

•Leaves – photosynthesis

•Stem – supports the plant

•Veins – transport water and minerals

How nutrients move•Xylem – moves water up (roots leaves)

•Phloem – moves sugar in both directions

Root

pressure

Transpiration

Cohesion

The Upward Flow of Water

RootPressure Cohesion Transpiration

Water is pushedinto theroots

Pull

Water stickstogetherand is

pulled up

Pull

Water evaporates

throughthe leaves

Push