Products of Photosynthesis by Salman Saeed Lecturer Botany
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This document provides information about the Plant Physiology and Ecology course taught by Salman Saeed at the University College of Management & Sciences in Khanewal, Pakistan. The course discusses the products of photosynthesis, including carbohydrates like glucose, fructose, sucrose, and starch. While plant physiologists have tried to determine the first product of photosynthesis, the results are still unclear. Hexoses are thought to be the first carbohydrates produced, followed by sucrose and later starch through condensation reactions. Oxygen is a byproduct of importance to nature, and the ratio of oxygen evolved to carbon dioxide absorbed was found to have a value of unity. Starch accumulates in chloroplasts after photosynthesis and
Products of Photosynthesis by Salman Saeed Lecturer Botany
- 1. Course Title: Plant Physiology and Ecology Course Instructor: SALMAN SAEED Botany department UNIVERSITY college of management & Sciences, Khanewal, PAKSITAN
- 2. Salman Saeed Lecturer (Botany) 2
- 3. ï‚ž The products of photosynthesis are the carbohydrates and oxygen. Four carbohydrates, D-glucose. D-fructose, sucrose and starch are commonly are formed in the green cells during photosynthesis. Plant physiologists and biochemists have tried to find the first product of this process. But still it is not clear which the first product of photosynthesis. 3 Salman Saeed Lecturer (Botany)
- 4. ï‚ž Hexoses: According Weevers the first Carbohydrates were the ï‚ž hexoses. After that sucrose and later starch appeared. Thus the carbohydrates appeared in the order of their complexity. The sucrose and starch are formed from hexoses by following equation. ï‚ž C6H1206 + C6F11206 C12H22011 +H20 ï‚ž Glucose + Fructose Sucrose 4 Salman Saeed Lecturer (Botany)
- 5. ï‚ž : It is a by-product of photosynthesis. It has great significance in nature. It is the most important means of returning oxygen to the atmosphere. The ratio of the volume of oxygen evolved to the volume of carbon dioxide taken in photosynthesis is called the photosynthetic ratio or photosynthetic quotient. Willstatter and Stoll found that the value of this ratio is unity. 5 Salman Saeed Lecturer (Botany)
- 6. ï‚ž : Starch is accumulated in the chloroplasts of most species after photosynthesis. Starch is not the first product of photosynthesis. It is the product of a secondary reaction called starch synthesis. It is formed by the condensation of sugar. The rate of starch synthesis depends upon on the rate of photosynthesis. Starch synthesis is an entirely independent process from photosynthesis. It starts after the process of photosynthesis. It can proceed only when sugar is present in the cells. Leaves of many species do not form starch. Yet photosynthesis takes place in them. Starch synthesis also takes place in the non-green cells of the stem. 6 Salman Saeed Lecturer (Botany)
- 7. ï‚ž Others are Amines and Sugar Phosphates 7 Salman Saeed Lecturer (Botany)
- 8. 8 Salman Saeed Lecturer (Botany)
- 9. Salman Saeed Lecturer (Botany) 9 Email:Salmanbotanist@gmail.com