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2.06 Introduction to Photosynthesis
Transcript of 2.06 Introduction to Photosynthesis
As organisms respire, they take in free oxygen and give off carbon dioxide. Respiration is dependent on photosynthesis because photosynthesis is the source of virtually all the free oxygen in the atmosphere and in bodies of water. In addition, photosynthesis removes carbon dioxide from the atmosphere and from bodies of water. If this carbon dioxide were not removed, it would eventually smother the organisms that produce it.
Coal and petroleum, composed of the remains of various kinds of organisms, contain energy that was captured from the sun's rays by photosynthesis millions of years ago.
During this presentation I'll be explaining the process of photosynthesis and respiration. Lets look at the beginning stages of A carbon atom's photosynthesis journey
There are two stages in the photosynthesis process
there are membrane sacs called the
. These sacs are intercontected piles and inside them is a membrane called
. Inside the Grana is where the photosynthesis process takes place
You see those little green plates? Those little plates are called chloroplast. Lets us zoom again and examine the Chloroplast.
Lets zoom in even closer
This is a plant leaf. Lets zoom
in and observe more closely
Fun fact: The Color of
comes from the chlorophyll molecules
Light Dependent Reactions
This process is also known as photoredection.This is the first stage of photosynthesis.this is the process in which plants store energy from the sunlight.
Light Independent Reactions
This process is also known as the Calvin cycle. This is the second stage of photosynthesis. This is the Process in which the stored energy carbon dioxide and form glucose.
The chemical energy possessed by ATP and NADPH2 is used in making carbohydrates from hydrogen and carbon dioxide. (The carbon dioxide is obtained from the environment.) The carbohydrates then possess the chemical energy given up by ATP and NADPH2.
Light enters a cell and is absorbed by chlorophyll. The light's energy raises the energy level of some chlorophyll electrons, freeing them from the chlorophyll molecules.
Molecules of water (H2O) from the environment take part in chemical reactions in the cell. Electrons from the hydrogen atoms in each of these water molecules are attracted to the chlorophyll molecules lacking the electrons freed in step 1. This attraction causes the water molecules to break apart into oxygen atoms, protons, and electrons. The oxygen atoms join together in pairs, forming molecules of oxygen. Oxygen molecules, called free oxygen, are released into the environment.
The electrons freed from the chlorophyll molecules and the protons freed from the water molecules take part in chemical reactions in the cell. These reactions result in the production of adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide diphosphate (NADPH2).
The generalized, overall chemical equation for photosynthesis is:
6CO2 + 12H2O + light C6H12O6 + 6O2 + 6H2O
The carbohydrate in this equation (C6H12O6) is glucose, a simple sugar. Glucose is only one of several compounds that can be formed by photosynthesis.
Importance of Photosynthesis
Photosynthesis is the most important chemical process for life. Through photosynthesis, the sun's energy is made available to all organisms. For example, when an animal eats a plant, it obtains chemical energy that the plant acquired through photosynthesis; when a second animal eats a plant-eating animal, it obtains some of the chemical energy that the first animal obtained by eating plants.