The importance of photosynthesis and respiration

Others are taller than people or animals. Animals obtain energy from eating plants. You can again use sodium hydrogencarbonate NaHCO3 as source of carbon dioxide and vary its concentration to vary the carbon dioxide concentration. In this 'set-up' you measure the rate of photosynthesis by measuring the rate of oxygen production as the gas is collected in the gas syringe.

Medicine Plants provide many useful drugs. The near absence of large PS II particles is a distinct feature of the stromal lamellae or intergranal lamellae.

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Rate of photosynthesis versus light intensity at different temperatures 2 factors Initially the graph lines are linear as the rate of photosynthesis is proportional to the light intensity see also Graph 1.

Most of the removed electrons and hydrogen ions ultimately are transferred to carbon dioxide CO2which is reduced to organic products. Then hydrogen and oxygen are produced as by products of the process, by converting water using the energy derived from the sun.

You can use from 0. Varying the light intensity is quite difficult, you need to position a lamp at different measured distances away from the pondweed tube. Photosystem I is composed of a heterodimer of proteins that act as ligands for most of the electron carriers Krauss et al.

Miller shows the inner surface of a thylakoid membrane. The crystal structure has been solved for cytochrome f from turnip Martinez et al. The photosynthetic membrane is composed mainly of glycerol lipids and protein.

Light is collected by pigment molecules that are bound to light- harvesting protein complexes located in the photosynthetic membrane. Indeed, some algae appear to have a closer evolutionary relationship with the protozoa or fungi than they do with other algae.

If the cytochrome is not present in the membrane, a stable PS II reaction center cannot be formed.

Photosynthesis for Kids

It is assumed that the rate of oxygen production is proportional to the rate of photosynthesis. The fate of the excited state energy is guided by the structure of the protein. Sulfur bacteria use hydrogen sulfide H2S as a source of hydrogen atoms and produce sulfur instead of oxygen during photosynthesis.

ATP is an energy storage molecule. Some cells respire aerobically, using oxygen, while others undergo anaerobic respiration, without using oxygen. The electrons are eventually transferred to the photosystem I reaction center.

This chemical change requires the ATP that was stored in the first part of the photosynthesis cycle. Our major sources of energy such as natural gas, coal and oil were made millions of years ago from the remains of dead plants and animals which we already know got their energy from photosynthesis.

Sunlight is absorbed by chlorophyll, a green pigment located in plant cell structures called chloroplasts. The oxygen that blue-green algae produced made it possible for other types of organisms to develop. Almost half a century passed before the concept of chemical energy had developed sufficiently to permit the discovery in that light energy from the sun is stored as chemical energy in products formed during photosynthesis.

The word photosynthesis can be separated to make two smaller words: The oxygen bubbles are channelled into a capillary tube and collected in a syringe.

The absorption spectrum of chloroplast chlorophyll a and b and carotenoids along with the action spectrum of photosynthesis of a chloroplast is shown in Fig.

When varying the temperature it is not easy to maintain a constant temperature - if it falls a little, you could use the average temperature, not as accurate, but better than nothing! Experiments indicate that the inner aqueous space of the photosynthetic membrane is likely continuous inside of the chloroplast.

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This is shown by the graph line becoming horizontal, and the maximum rate is now dependent on the temperature ie the higher the temperature the greater the maximum rate possible.

Photosynthesis Photosynthesis takes place in the cells of plant leaves. For these experiments a suitable light intensity must be chosen and kept constant! Chlorophyll, along with other pigments present in the chloroplast, absorbs the light energy of all colors but green for use in the photosynthesis process.

As the blue-green algae grew in the earth's seas, they began to fill the atmosphere with oxygen. Graphs of experimental data and their interpretation Seven graphs have already been fully described on this page. It might ok just to measure the speed of a bubble down the capillary tube, BUT what happens if it fills with oxygen gas - you won't see any movement See method 3 next.

Both plants and animals are complex organisms that are made up of many types of cells, but plant cells have thick, rigid walls that consist of a material called cellulose. Photosynthetic membranes effectively limit electron transport to two dimensions.Algae, singular alga, members of a group of predominantly aquatic photosynthetic organisms of the kingdom have many types of life cycles, and they range in size from microscopic Micromonas species to giant kelps that reach 60 metres ( feet) in length.

Their photosynthetic pigments are more varied than those of plants, and their cells have features not found among plants. Factors controlling the rate of photosynthesis - detailed discussion of typical data graphs.

Graph 1. Light limitation. Light energy is needed for photosynthesis, so as the light intensity increases, the rate of photosynthesis chemical reactions steadily increases in a linear manner - 1st. After learning about Aerobic and Anaerobic Respiration, revise the topic and test yourself to affirm your knowledge.

Photosynthesis, the beginning of energy flows in plants and animals; food chains and energy pyramids, energy changes and heat flow beginning with photosynthesis. Cellular respiration is the process of oxidizing food molecules, like glucose to carbon dioxide and water.

Learn more about cellular respiration steps. Overview of Photosynthesis. Word Origin. From the Greek: photo, “light”, and synthesis, “putting together”. Definition of Photosynthesis. Photosynthesis is the process by which green plants, algae and some forms of bacteria use energy from sunlight to convert carbon dioxide and water into glucose.

The importance of photosynthesis and respiration
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