Transcript Ch. 2
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 Time 1 day 2 days 5 days Observations • 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 Song Photosynthesis Carbon Dioxide Oxygen Chloroplast Sunlight (Energy) *Chlorophyll inside grana absorbs energy in sunlight Glucose (Food) Water Where does photosynthesis occur? • Photosynthesis occurs in the leaves of a plant. • Many chloroplasts found here • Simple Leaves • Compound Leaves Inside a Leaf Leaves Kinds •Simple – one blade •Compound – many blades 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 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 Parts How nutrients move •Always small •No transport structures •Absorbs water and minerals •Flat, close to water source •No roots (diffusion) •Moss, liverwort, hornwort •No stem •No leaves 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 The Upward Flow of Water Root Pressure Push Water is pushed into the roots Cohesion Pull Water sticks together and is pulled up Transpiration Pull Water evaporates through the leaves