Presentation on theme: "Photosynthesis is the process by which green plants and certain other organisms create energy. Plants collect energy from sunlight and use this energy."— Presentation transcript:
Photosynthesis is the process by which green plants and certain other organisms create energy. Plants collect energy from sunlight and use this energy to make a sugar called glucose. Glucose is the main source of nutrition for plants, fueling their cells for function and growth. In addition, plants use their roots to drink up water from the soil, and that water travels from the roots to the plant's leaves. Meanwhile, leaves absorb carbon dioxide from the air, and the water and carbon dioxide spread through the leaves into cells called the palisade and spongy cells. These cells contain structures called chloroplasts, which are filled with a green pigment called chlorophyll–it’s chlorophyll that gives plants their green color. In photosynthesis, chlorophyll traps energy from sunlight, storing it as chemical energy. The process splits water molecules into hydrogen and oxygen atoms, and chemical energy is used to create glucose from the hydrogen and carbon dioxide. The glucose dissolves into extra water molecules and gives the plant plenty of food for growth. Most forms of photosynthesis release oxygen as a byproduct. So, in a way, plants breathe in carbon dioxide and breathe out oxygen! Since we do the opposite, the cycle goes back and forth in the air! WHAT IS PHOTOSYNTHESIS? PHOTOSYNTHESIS VIDEO 1.Which of the following do plants gain from sunlight? A. Carbon dioxide B. Energy C. Sugar D. Water 2.What might happen if plants could not produce glucose? A. They would not be green B. They could not grow and function C. They could not absorb energy from the sun D. They would not have leaves 3. Chlorophyll traps energy from sunlight and stores it as what kind of energy? A. Kinetic B. Heat C. Color D. Chemical 4. In photosynthesis, water molecules are split into _______ and _______ atoms. A.Hydrogen and oxygen B.Sulfur and lithium C.Carbon and nitrogen D.Glucose and fructose Chloroplast
Directions for Photosynthesis Leaf: 5 Arrows: Write out each description. Reactants (blue), energy (yellow), products (red). – Reactant & sunlight arrows point INTO leaf; Product arrows point OUT of leaf. – CO2 (carbon dioxide) enters the leaf. – H2O (water) enters the leaf. – Sunlight is trapped by chlorophyll. – C6H12O6 (glucose) travels through leaf to be used by plant. – O2 (oxygen) is released into the atmosphere. Leaf: Glue top leaf onto bottom ONLY up to the dotted line! Top leaf: color green yellow Bottom leaf: color yellow, chloroplasts are green. Glue whole thing onto back of handout. Reactants go into top leaf. Sunlight goes into yellow part. Products go out of bottom leaf.