Biology - Photosynthesis

Olympiad, Foundation, NEET, AIIMS, CBSE, iGCSE, GCSE, MCAT, AP-Biology & More

4.00 (1 reviews)
Udemy
platform
English
language
Science
category
instructor
Biology - Photosynthesis
6
students
2 hours
content
Jan 2022
last update
$22.99
regular price

What you will learn

What do we Know?

Early Experiments

Where does Photosynthesis take place?

How many Pigments are involved in Photosynthesis?

What is Light Reaction?

The Electron Transport

Where are the ATP and NADPH Used?

The C4 Pathway

Photorespiration

Factors affecting Photosynthesis

Why take this course?

SUMMARY

Green plants make their own food by photosynthesis. During this process carbon dioxide from the atmosphere is taken in by leaves through stomata and used for making carbohydrates, principally glucose and starch. Photosynthesis takes place only in the green parts of the plants, mainly the leaves. Within the leaves, the mesophyll cells have a large number of chloroplasts that are responsible for CO2 fixation. Within the chloroplasts, the membranes are sites for the light reaction, while the chemosynthetic pathway occurs in the stroma. Photosynthesis has two stages: the light reaction and the carbon fixing reactions. In the light reaction the light energy is absorbed by the pigments present in the antenna, and funnelled to special chlorophyll a molecules called reaction centre chlorophylls. There are two photosystems, PS I and PS II. PS I has a 700 nm absorbing chlorophyll a P700 molecule at its reaction centre, while PS II has a P680 reaction centre that absorbs red light at 680 nm. After absorbing light, electrons are excited and transferred through PS II and PS I and finally to NAD forming NADH. During this process a proton gradient is created across the membrane of the thylakoid. The breakdown of the protons gradient due to movement through the F0 part of the ATPase enzyme releases enough energy for synthesis of ATP. Splitting of water molecules is associated with PS II resulting in the release of O2 , protons and transfer of electrons to PS II.

In the carbon fixation cycle, CO2 is added by the enzyme, RuBisCO, to a 5- carbon compound RuBP that is converted to 2 molecules of 3-carbon PGA. This is then converted to sugar by the Calvin cycle, and the RuBP is regenerated. During this process ATP and NADPH synthesised in the light reaction are utilised. RuBisCO also catalyses a wasteful oxygenation reaction in C3 plants: photorespiration.

Some tropical plants show a special type of photosynthesis called C4 pathway. In these plants the first product of CO2 fixation that takes place in the mesophyll, is a 4-carbon compound. In the bundle sheath cells the Calvin pathway is carried out for the synthesis of carbohydrates.


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Reviews

Marius
October 23, 2023
Yes, I find the course on photosynthesis very interesting. I like the way that the course is presented. She speaks clearly and I can keep up with her explanations. Her drafting skill is fantastic!

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4499504
udemy ID
1/17/2022
course created date
2/20/2022
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