top-rated free essay

Green Plants

Dec 21, 2011 574 Words
Green plants absorb light energy using chlorophyll in their leaves. They use it to react carbon dioxide with water to make a sugar called glucose. The glucose is used in respiration, or converted into starch and stored. Oxygen is produced as a by-product. This process is called photosynthesis. Temperature, carbon dioxide concentration and light intensity are factors that can limit the rate of photosynthesis. Plants also need mineral ions, including nitrate and magnesium, for healthy growth. They suffer from poor growth in conditions where mineral ions are deficient. Photosynthesis

Photosynthesis is the chemical change which happens in the leaves of green plants. It is the first step towards making food - not just for plants but ultimately every animal on the planet. During this reaction, carbon dioxide and water are converted into glucose andoxygen. The reaction requires light energy, which is absorbed by a green substance called chlorophyll. Photosynthesis takes place in leaf cells. These contain chloroplasts, which are tiny objects containing chlorophyll.

Cross-section through a leaf cell
Here is the equation for photosynthesis:
carbon dioxide + water (+ light energy)    →    glucose + oxygen 'Light energy' is shown in brackets because it is not a substance. You will also see the equation written like this:

Plants absorb water through their roots, and carbon dioxide through their leaves. Some glucose is used for respiration, while some is converted into insolublestarch for storage. The stored starch can later be turned back into glucose and used in respiration. Oxygen is released as a by-product of photosynthesis.

Plants and minerals
Plants need to take in a number of elements to stay alive. The most important are: * carbon
* hydrogen
* oxygen
Plants get hydrogen and oxygen from water in the soil, and carbon and oxygen from carbon dioxide and oxygen in the atmosphere. Water and carbon dioxide are used to synthesise food during photosynthesis. Oxygen is used to release energy from food during respiration. In addition to these three elements, plants need a number of minerals for healthy growth. These are absorbed through the roots as mineral ions dissolved in the soil water. Two important mineral ions needed by plants are: * nitrate - for making amino acids, which are needed to make proteins * magnesium - for making chlorophyll

If a plant does not get enough minerals, its growth will be poor. It will suffer from deficiency symptoms: * deficient in nitrate - it will suffer from stunted growth * deficient in magnesium - it's leaves will turn yellow

The tomato plant on the left is healthy, the one on the right is growing in conditions where mineral ions are deficient

CO2 is absorbed, O2 is released, much like in a mammal respiratory system, O2 is absorbed, CO2 is released. This is the chemical equation of photosynthesis from http://www.purchon.com/chemistry/chemical.htm: Carbon Dioxide + Water = Glucose + Oxygen

6CO2 + 6H2O Light ...........= Chlorophyll C6H12O6
This is the chemical equation of cellular respiration from http://www.purchon.com/chemistry/chemical.htm: Glucose + Oxygen = Carbon Dioxide + Water + Energy
C6H12O6 + 6O2 = 6CO2 + 6H2O + Energy
As you can see, the reactants of photosyntheis are the products of cellular respiration, and vise versa. The two chemical equations make a cycle, which sustains plant and animal life. Plants use carbon dioxide in photosynthesis, which produces oxygen through chemical reactions. Plants need carbon dioxide to live, and animals (indluding humans) require oxygen. Therefore, it is a beneficial cycle to both plants and animals. Good luck!

Read more: http://wiki.answers.com/Q/How_are_the_reactants_and_products_of_photosynthesis_related

_to_the_idea_of_respiration#ixzz1Ujt1cOym

Cite This Document

Related Documents

  • People and Plants

    ...The symbiotic relationship between plants and people is made possible by the differences between cellular respiration and photosynthesis. While cellular respiration occurs in all living organisms, photosynthesis relies on chlorophyll and is unique to plants, algae, and some bacteria. Respiration and photosynthesis are essentially the same proce...

    Read More
  • Transpiration Rates in Plants

    ...Biology Assignment Transpiration rates between Exotic vs. Native plants In this investigation we will be looking at transpiration. The topic we will be focusing on is transpiration rates between native plants as well as exotic plants. We will be experimenting with 2 native plants as well as 2 exotic plants. The reason we are experimenting ...

    Read More
  • The Affect of Diffrent Colored Light on Plant Growth

    ...The Affect of Different Colored Light on Plant Growth Puprose: Just as we are happier and healthier when we receive adequate sunlight, so are the plants and vegetation that we grow. Sunlight, or other means of artificial lighting is essential to help a plant grow into maturity. It is also necessary in aiding the plant to get the nutrients...

    Read More
  • Lab Report Plant Pigment

    ...Lab 11- Plant pigment and Photosynthesis Zelda Salfati December 20th, 2012 ...

    Read More
  • Macroscopic Nutrient's Effects on Tomato Plants

    ...DATA 21 WEAKNESSES OF INVESTIGATION 23 IMPROVEMENTS OR FUTURE INVESTIGATIONS 23 CONCLUSION 25 INTRODUCTION Hydroponics is a technique of growing plants without basing them in soil. Hydroponic systems have been used since ancient times; it is believed that the legendary Hanging Gardens of Babylon employed a technique of ‘flowing wa...

    Read More
  • Extraction of Plant Pigment

    ...INTRODUCTION Plant pigments consist of four main chemicals. These are Chlorophylls, The carotenoids, Anthocyanin and Betacaine. The aims of this experiment is to separate the plant pigment into different colours using solvents and column chromatography. The hypothesis of this experiment is that this plant pigment from spinach will contain the...

    Read More
  • Plant Symbiosis

    ...Abstract: Symbiosis is very important in the plant world. Fungus has a symbiotic relationship with other plants. This may help the plant through tough times, for example; droughts and long winters. There are many careers that study the problems of symbiotic plants. Symbiosis with Plants Symbiosis with plants is very important. Fungus helps ...

    Read More
  • Lab Experiment: Effect of Amount of Water on Plant Growth

    ...What Amount of Water Grows the Plant the Longest? Daniel Rivera Alfonso Pineda Mrs. Fraijo AP Biology 10 June 2012 Abstract: In this experiment, 8 plants will be tested. Each except one plant (which will be the control group) will receive a certain amount of water starting at 0 teaspoons of water. Each plant will receive 1 more tea...

    Read More

Discover the Best Free Essays on StudyMode

Conquer writer's block once and for all.

High Quality Essays

Our library contains thousands of carefully selected free research papers and essays.

Popular Topics

No matter the topic you're researching, chances are we have it covered.