Meeting the Needs

Plants can’t eat… …what do they release energy from?

Photosynthesis Water + Carbon dioxideOxygen + Glucose sunlight

How do plants absorb light?

Chlorophyll in chloroplasts

Which colour of light do plants absorb?

Plants absorb blue and red light

How do plants take in, and transport, water?

Water enters roots by osmosis. Water is transported in xylem vessels

Xylem vessels carry water throughout the plant, from root to leaf. They work just like our circulatory system.

Place your piece of celery in a small beaker of food colouring. Place your white flower in a test tube of food colouring. How does water get from roots to leaves?

How do plants take in carbon dioxide and release oxygen?

Gases enter and exits leaves through pores called stomata.

Stomata

Where are the stomata on lily pads?

View Stomata by taking a print of a leaf using clear nail varnish and then make a slide to view under the microscope

What happens to the glucose made by photosynthesis?

Used immediately for energy Stored as Starch Used as building material Cellulose in cell walls. Food store in tuber. Fruit production.

Stored as Starch

Test a leaf for Starch

How is glucose transported around plants?

Glucose (food) is transported in phloem vessels. Phloem vessels are made of living cells.

Absorbed by the chemical chlorophyll found in chloroplasts. Is used by the plant or exits through the stomata. Enters through the stomata. How does water get from root to leaf?

Cuticle: stops water loss Epidermis: protects leaf Pallisade mesophyll: cells close together with lots of chloroplasts to absorb light Spongy mesophyll: cells are spread out to let gases move easily inside the leaf Stomata: lets gases in and out of leaf Leaf Cross Section

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