NEET Exam > NEET Videos > Biology Class 11 > Light Reactions & Photo-Phosphorylation
Light Reactions & Photo-Phosphorylation Video Lecture | Biology Class 11 - NEET
|
181 videos|361 docs|148 tests
|
FAQs on Light Reactions & Photo-Phosphorylation Video Lecture - Biology Class 11 - NEET
| 1. What are light reactions in photosynthesis? |  |
Ans. Light reactions are the initial phase of photosynthesis where light energy is converted into chemical energy. These reactions occur in the thylakoid membranes of chloroplasts and involve the absorption of light by pigments such as chlorophyll. The energy is then used to generate ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate), which are essential for the subsequent dark reactions.
| 2. How does photo-phosphorylation occur in light reactions? | |
Ans. Photo-phosphorylation is the process of generating ATP using light energy during the light reactions of photosynthesis. It occurs through two different mechanisms: cyclic and non-cyclic photo-phosphorylation. In cyclic photo-phosphorylation, the excited electrons from the reaction center of photosystem I are passed back to the electron transport chain, creating a proton gradient that drives ATP synthesis. In non-cyclic photo-phosphorylation, the excited electrons from photosystem II are used to reduce NADP+ to NADPH, and the resulting proton gradient is utilized by ATP synthase to generate ATP.
| 3. What is the role of chlorophyll in light reactions? | |
Ans. Chlorophyll is a pigment found in chloroplasts that plays a crucial role in light reactions. It absorbs light energy from the electromagnetic spectrum, particularly in the red and blue regions, and transfers this energy to the reaction centers of photosystems I and II. The excited electrons from chlorophyll are then passed through an electron transport chain, leading to the generation of ATP and NADPH. Without chlorophyll, plants would not be able to capture and utilize light energy for photosynthesis.
| 4. How does the electron transport chain function in light reactions? | |
Ans. The electron transport chain is a series of protein complexes embedded in the thylakoid membrane of chloroplasts. During light reactions, this chain functions by accepting high-energy electrons from the reaction center of photosystem II. These electrons are then passed through a series of redox reactions, releasing energy that is used to pump protons (H+) across the thylakoid membrane and create a proton gradient. This gradient is essential for ATP synthesis and the subsequent reduction of NADP+ to NADPH.
| 5. What is the significance of light reactions in photosynthesis? | |
Ans. Light reactions are vital for the process of photosynthesis as they capture and convert light energy into chemical energy. They produce ATP, which is the primary energy currency of cells, and NADPH, a reducing agent necessary for the dark reactions (Calvin cycle) that produce glucose. Without light reactions, plants would not be able to generate the energy and reducing power required for the synthesis of carbohydrates, essential for their growth and survival.
About this Video
|
1.4K Views |
|
4.76/5 Rating |
|
Dec 23, 2024 Last updated |
Video Description: Light Reactions & Photo-Phosphorylation for NEET 2024 is part of Biology Class 11 preparation.
The notes and questions for Light Reactions & Photo-Phosphorylation have been prepared according to the NEET exam syllabus.
Information about Light Reactions & Photo-Phosphorylation covers all important topics for NEET 2024 Exam.
Find important definitions, questions, notes, meanings, examples, exercises and tests below for Light Reactions & Photo-Phosphorylation.
Introduction of Light Reactions & Photo-Phosphorylation in English is available as part of our Biology Class 11 for NEET & Light Reactions & Photo-Phosphorylation in
Hindi for Biology Class 11 course. Download more important topics related with notes, lectures and mock test series for
NEET Exam by signing up for free.
Description
Video Lecture & Questions for Light Reactions & Photo-Phosphorylation Video Lecture | Biology Class 11 - NEET - NEET full syllabus preparation | Free video for NEET exam to prepare for Biology Class 11.
Information about Light Reactions & Photo-Phosphorylation
Here you can find the meaning of Light Reactions & Photo-Phosphorylation defined & explained in the simplest way possible.
Besides explaining types of Light Reactions & Photo-Phosphorylation theory, EduRev gives you an ample number of questions to practice Light Reactions & Photo-Phosphorylation tests,
examples and also practice NEET tests.
|
181 videos|361 docs|148 tests
|
|
Explore Courses for NEET exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
Related Searches
Light Reactions & Photo-Phosphorylation Video Lecture | Biology Class 11 - NEET
,video lectures
,ppt
,Light Reactions & Photo-Phosphorylation Video Lecture | Biology Class 11 - NEET
,study material
,Important questions
,Sample Paper
,Viva Questions
,Extra Questions
,mock tests for examination
,past year papers
,Light Reactions & Photo-Phosphorylation Video Lecture | Biology Class 11 - NEET
,shortcuts and tricks
,Semester Notes
,Objective type Questions
,Previous Year Questions with Solutions
,Summary
,MCQs
,Free
,practice quizzes
,Exam
;
Study Light Reactions & Photo-Phosphorylation on the App
Students of NEET can study Light Reactions & Photo-Phosphorylation alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Light Reactions & Photo-Phosphorylation,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Light Reactions & Photo-Phosphorylation is prepared as per the latest NEET syllabus.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup