Photosynthesis Essay

THE FACTOR AFFECTİNG THE RATE OF PHOTOSYNTHESIS: LIGHT WAVELENGHT

İpek Kâhya

10B

No:55

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CONTENTS

Autotrophs

chemoautotrophs photoautotrophs Photosynthesis

Factors affecting the rate of photosynthesis

Environmental

Genetic

Lab report

Introduction

Purpose

Materials

Experimental set-up

Procedure

Analysis

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Autotrophs, can build organic compounds from simple molecules such as water and carbon dioxide and their type of feeding is called autotrophic nutrition. While they are building complex molecules, they need large amounts of energy. They are divided into two groups according to their source of energy: chemoautotrophs and photoautotrophs. Chemoautotrophs can synthesize organic compounds from CO₂ AND H₂O by using inorganic oxidation energy and they do not require sunlight. However, photoautotrophs, including green plants, produce sugar and O₂ from CO₂ and H₂O by using sunlight. The green pigment which absorbs the light is called chlorophyll and this process is called photosynthesis.

Photosynthesis can occur in any green part of the plant. This green part contains chloroplasts. Chloroplasts separate photosynthesis and other cellular activities. The cytoplasm like liquid, stroma, in chloroplast consists of ribosome, DNA, and enzymes which takes part in photosynthesis. There are two stages in photosynthesis: light dependent and light independent. In light dependent stage, by using light energy water is broken into hydrogen and oxygen. In light independent stage, hydrogen reacts with CO₂. Also, water is reformed. This stage both happens when it is dark or light.

Photosynthesis has very important roles in our lives. Michael Roberts says:”Although it is difficult to arrive at a total world figure for photos...

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...k, split off one leaf from both of the plants.

Drop iodine to both of the leaves.

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Analysis:

When I dropped iodine to the leaf where I split off from the plant which had waited in red light, its color changed into blue. However, when I dropped iodine to the leaf where I split off from the plant which had waited in green light, its color stayed the same. It is because the plant waited in red light could make more photosynthesis than the other one, so it has more glucose and an iodine solution makes substance’s color blue if it has starch. It is used to test the presence of starch.

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WORKS CITED

Aydın Parim, Ganime. Biology with activities. İstanbul: Oran, Print.

Kent, Michael. Advanced Biology. Oxford: Oxford UP, 2000. Print.

Roberts, Michael, Michael J. Reiss, and Grace Monger. Advanced Biology. Walton-on-Thames: Nelson, 2000. Print.

Works Cited