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Leaves turn yellowish in the fall because the chlorophyll, which is green in color, disappears from the leaves. In the fall and winter, there is not enough light or water for the plant to form photosynthesis, and so the chlorophyll kind of "dies down. Instead the pigments of the carotenoids start to show.

Chlorophyll - green.

Carotenoid - yellow, orange, brown.

Anthocyanin - red.

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http://www.buzzle.com/articles/photosynthesis-and-cellular-respiration.html

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Video comparing Photosynthesis and Cellular Respiration

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Comparison of Cellular Respiration and Photosynthesis

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A video for my UMass on-line class, Botany for Gardeners.

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How are respiration and photosynthesis related

Photosynthesis
Is the chemical process where plants can capture and organically fix the energy of the sun. This chemical reaction can be described by the following simple equation:
CO₂ + H₂O + light energy = Sugars + O₂
The main product of photosynthesis is a carbohydrate, such as the sugar glucose, and oxygen which is released to the atmosphere (the earth's atmosphere presently contains 20% ofO₂)

Respiration
Is the typical process where mitochondria of cells of organisms release chemical energy from sugar and other organic molecules through chemical oxidation. This process occurs in both plants and animals. In most organisms, respiration releases the energy required for all metabolic processes. This chemical reaction can be described by the following simple equation:
Sugars + O₂ = CO₂ + H₂O + released energy

-Through the process of photosynthesis, green plants absorb solar energy and remove carbon dioxide from the atmosphere to produce carbohydrates (sugars). Plants burn these carbohydrates (and other products derived from them) through the process of respiration, the reverse of photosynthesis. Respiration releases the energy contained in sugars for use in metabolism.
-This process is not balanced because the oxygen used for respiration is much less than what is given off during the photosynthetic reaction and the carbon dioxide given off is much less than what is taken up during photosynthesis. This is because plants need the sugar molecules not only for energy but also for structural elements (plants are largely cellulose - which is a long sugar molecule).

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During photosynthesis, a plant is able to convert solar energy into a chemical form. It does this by capturing light coming from the sun and, through a series of reactions, using its energy to help build a sugar molecule called glucose.

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5 Similarities
1) Both involve electron transport chains.
2) Chemiomosis allows ATP synthase to produce ATP.
3) Both take place at some point within an organelle (mit. = CR, chloroplast= photo.)
4) Both utilize ATP for energy at some points.
5) Both provide power for cellular activities.

5 Differences
1)Cellular respiration depends on oxygen as a substrate.
2)Photosynthesis utilizes 2 electron transport chains (not just 1).
3)In Photo. , energy is provided by photons and not catabolic processes, processes in which more complex structures are broken down into simpler ones, as in cell. resp.
4)Photosynthesis involves the production of NADPH (CR involves NADH and FADH2)
5)Photosynthesis involves CO2 and H20 as substrates (splitting h20 provides the electrons for the process).

Substrate in this case refers to the thing that CAUSES the change, much like in enzymes.

Courtesy of Yahoo Answers.

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The explanation to the graph shown above is as follows:

Sunlight mainly gives off red and blue wavelengths of lights are most common among sunlight, so the chlorophyll absorbs these two types of wavelength the most, indicated by the spikes in the graph when the wavelength of the light is in the blue and red region. Because green is not absorbed but reflected, as shown by the lower levels of amount of light absorbed, leaves tend to be green, as visible colors are because of the light that is reflected rather than absorbed.

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1.) The first video explains basic functions of Cell Respiration (The red weirdo) and Photosynthesis (the green weirdo) in a human body or in any forms of life.

To obtain energy needed for life, organisms depend on the processes of cellular respiration and photosynthesis. Though they share the same function of changing energy from one form to another, there are many differences between cellular respiration and photosynthesis in regard to the input and output molecules, energetics, cellular location, and ecological importance.

-The chemical equations of cellular respiration and photosynthesis are opposites.

(http://www.studymode.com/essays/Cellular-Respiration-Vs-Photosynthesis-141565.html)

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Introduction to Photosynthesis & Cellular Respiration Flipped Video Lecture

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Comparison of Cellular Respiration and Photosynthesis

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Science of Photosynthesis and Resperatopm

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Chlorophyll absorbs light energy of the Red end of the Spectrum, Green middle of Spectrum and the Blue end of the spectrum.

Substances can either absorb the wavelength (Color) of light (the energy is used) or reflect that wavelength (you will see the color).

Chlorophyll absorbs light for photosynthesis and since chlorophyll is is green it reflects the green and absorbs the re and blue. The red and blue are then used for photosynthesis and the green is reflected which is why we see the plant as green.

Equation: 6H2O + 6CO2 + Light Energy -> C6H12O6 + 6O2.

Stages: 1) A set of reactions that trap light energy and convert it to chemical energy of ATP.

2) A set of reactions where ATP is used to help bond carbon dioxide and water molecules together to create a sugar, such as glucose.

HL Biology Book

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Graph that compare these two

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Photosynthesis and respiration are reactions that complement each other in the environment. They are in reality the same reactions but occurring in reverse. While in photosynthesis carbon dioxide and water yield glucose and oxygen, through the respiration process glucose and oxygen yield carbon dioxide and water.

They work well since living organisms supply plants with carbon dioxide which undergoes photosynthesis and produces glucose and these plants and bacteria give out oxygen which all living organisms need for respiration.

Comparison chart

Contents: Photosynthesis vs Cellular Respiration

Definitions of photosynthesis and respiration

Photosynthesis is a process in photoautotrophs that converts carbon dioxide into organic compounds in the presence of sunlight. Respiration is the set of metabolic reactions that take in cells of living organisms that convert nutrients like sugar into ATP (adenosine tri phosphate) and waste products.

Processes involved

Processes in photosynthesis are divided on basis of requirement of sunlight while respiration processes are divided on basis of requirement of oxygen. Hence in photosynthesis you have the light dependent reactions and the dark reactions while in respiration there is aerobic respiration and anaerobic respiration.

In photosynthesis light dependent reactions, ultra violet light strikes chlorophyll pigments which excites electrons leading to separation of oxygen molecules from carbon dioxide. In the dark reactions, carbon molecules now independent of oxygen are converted into carbohydrates and stored in plant cells as energy and food source. In aerobic cellular respiration oxygen is utilized to convert organic compounds into energy and in anaerobic respiration converts organic compounds into energy without using oxygen.

Site of Reactions

Photosynthesis takes place in the chloroplasts and organelles of a plant cell. Respiration takes place in the cytoplasm and mitochondria in the cell of a living organism.

Reaction kinetics

The electron acceptor in photosynthesis is NAD+ while in respiration the electron acceptor is NADH. In cellular respiration reaction 36 molecules of ATP are produced in complete oxidation of one molecule of glucose.

Video comparing Photosynthesis and Respiration

References

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What's the difference between Cellular Respiration and Photosynthesis? Photosynthesis and respiration are reactions that complement each other in the environment. They are in reality the same reactions but occurring in reverse. While in photosynthesis carbon dioxide and water yield glucose and oxygen, through the respiration...