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 tube 2.Observe for 1 week

TimeObservations 1 day 2 days 5 days 11 total

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 Parts Epidermis – 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 Root Pressure Cohesion Transpiration Water is pushed into the roots Pull Water sticks together and is pulled up Pull Water evaporates through the leaves Push