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12 s070201 i_photosynthesis
- 1. Photosynthesis or How Plants Make Food
- 2. Energy from the Sun is necessary to begin the process. Besides green plants, some algae and bacteria can also make their own food.
- 3. Radiant energy from the Sun, in the form of light, begins photosynthesis. Chlorophyll must also be present.
- 4. Water is taken into the plant by the roots and carried to the leaves through the xylem . Xylem is a H20 H20 H20 series of tubes.
- 5. Carbon dioxide gas (CO2) is taken into the plant through the stomata on the underside of leaves. CO2 CO 2 CO 2 H20 H20 H20
- 6. Oxygen gas (O2) is released into the atmosphere through the stomata on the under side of leaves. O2 O2 O2 H20 H20 H20
- 7. During photosynthesis, radiant (light) energy from the Sun is converted into chemical energy through a chemical reaction. The glucose (a type of sugar) that is produced is used both to keep the plants alive and stored by plants to be used by animals that then eat the plants.
- 8. Water vapor is released into the atmosphere through the stomata on the leaves. 0 H2 H2 0 H 20 This process is called transpiration.
- 9. Review the O2 process. CO H 20 2 O2 0 H2 H2 0 O2 CO 2 H20 CO 2 H20 H20 Explain each step as it is shown.
- 10. Remember, this process is continuous in O 2 CO H0 2 light. O 2 2 0 H2 H2 0 O2 CO 2 H20 CO 2 H20 H20
Hinweis der Redaktion
- Organisms that make their own food are called autotrophs. There are only a few organisms, other than green plants, that can do this.
- Radiant energy is energy traveling in waves for example electromagnetic radiation, as heat, light, or x-rays. All components of photosynthesis may be present, but without the plant pigment chlorophyll no photosynthesis will take place.
- Introduce students to the terms xylem and phloem. They do not need to memorize these terms. Xylem is a series of tubes which carry water and minerals up to the leaves. Phloem is plant tissue that conducts and distributes sugars from the places where the food is produced to the places where it is needed or stored.
- To avoid misconceptions from developing, remind students that carbon dioxide is always in the air and that plants to not use all the CO 2 available.
- Oxygen is a product of the process of photosynthesis.
- Glucose (sugar) is also a product of photosynthesis.
- Water in the form of vapor (gas) is a product of photosynthesis.