photosynthesis reactions

food from light

Most of the energy used by living things comes either directly or indirectly from the sun. Thats because sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms synthesize glucose (C6 H12 O6 ). The process uses carbon dioxide and water and also produces oxygen. The overall chemical equation for photosynthesis is: 6CO2 + 6H2 O + Light Energy C6 H12 O6 + 6O2 Photosynthesis changes light energy to chemical energy. The chemical energy is stored in the bonds of glucose molecules. Glucose, in turn, is used for energy by the cells of almost all living things. Photosynthetic organisms such as plants make their own glucose. Other organisms get glucose by consuming plants (or organisms that consume plants). Q: How do living things get energy from glucose? A: They break bonds in glucose and release the stored energy in the process of cellular respiration.

photosynthetic organisms

The organisms pictured in the Figures 1.1, 1.2, and 1.3 all use sunlight to make glucose in the process of photo- synthesis. In addition to plants, they include bacteria and algae. All of these organisms contain the green pigment chlorophyll, which is needed to capture light energy. A tremendous amount of photosynthesis takes place in the plants of this lush tropi- cal rainforest.

textbook_image

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questions

the reactants of photosynthesis include

-->  a) oxygen.

b) chlorophyll.

c) carbon dioxide.

d) two of the above

the products of photosynthesis include

a) energy.

b) carbon dioxide.

c) water.

-->  d) oxygen.

photosynthesis changes light energy to chemical energy.

-->  a. true

b. false

photosynthesis takes place in a single chemical reaction.

a. true

-->  b. false

organisms that undergo photosynthesis include

a) plants.

b) cyanobacteria.

c) algae.

-->  d) all of the above

diagram questions

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