Tag: botany
Questions Related to botany
PS I and PS II occur over
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Grana of chloroplast
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Matrix of mitochondria
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Stroma of chloroplast
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Inner membrane of mitochondrion
The process that converts light energy into chemical energy takes place in a multi-protein complex called a photosystem. Two types of photosystems are embedded in the thylakoid membrane:- photosystem II ( PSII) and photosystem I (PSI). Each photosystem plays a key role in capturing the energy from sunlight by exciting electrons. These energized electrons are transported by “energy carrier” molecules, which power the light-independent reactions.
How many PGAL molecules would regenerate 15 RuBP
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30
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25
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15
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20.
Excitation of chlorophyll by light is
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Exergonic reaction
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Anabolic reaction
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Photochemical reaction
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Photooxidation reaction
The first and foremost step of photosynthesis is the excitation of chlorophyll molecule which occurs with the absorption of light. This reaction is photochemical reaction since involves light and results in chemical change by transfer of electrons. The pigments present in the photosystems absorb photon of light. The photons excite electrons in the chlorophyll which then move through the electron transport chain and results in the production of carbohydrates and energy packets NADPH, ATP with the release of oxygen.
Light reaction of photosynthesis is also called
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Calvin cycle
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Hill reaction
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TCA cycle
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All of the above
The Hill reaction implies that the light-dependent reaction of photosynthesis is a result of a series of redox reactions and a suitable terminal electron acceptor is required for that reaction to occur. Hence, solar energy is converted to chemical energy by the reduction of NADP to NADPH.
First reaction in photosynthesis is
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Photolysis of water
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Excitation of chlorophyll molecules
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Formation of ATP
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Fixation of CO$ _2$
During the first stage of photosynthesis, called the light-dependent reaction, sunlight excites the electrons in the chlorophyll pigment. The organism uses this energy to create the energy carrier molecules ATP and NADPH, which are crucial for carbon fixing during the second stage.
How much oxygen is formed from 264 g of $CO _2$ and 216 g of $H _2O$?
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96 g
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216 g
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264 g
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192 g.
- Moles = Weight in gms/molecular weight
- In same way moles of H2O = 216/18 = 12 moles.
Fluoroscence differs from phosphorescence in being
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Delayed emission
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Instant emission
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Bioluminescence
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Chemiluminescence
In plants, food formation during photosynthesis takes place
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In root
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In leaf
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In stem
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In flower
Photosynthesis is the process by which plant utilizes the energy obtained from sunlight to produce glucose from carbon dioxide and water. During this process, oxygen is released as the by product. It takes place in leaf cells. Leaf cells contain chloroplasts. The chloroplasts contain green pigment chlorophyll which prepares the food during photosynthesis.
Red drop and Emerson effect have proved the existence of ______________.
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Light and dark reactions is photosynthesis
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Two distinct photo systems is photosynthesis
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The supply of electrons from oxygen evolving complex
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Electron transport from water to NDAP$+$ across thylakoids
When sun light hits the chloroplast, then
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Increase in $pH$ of thylakoid lumen relative to stroma occurs
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A measurable decreases in $pH$ in the thylakoid lumen relative to stroma occurs
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A measurable decrease in $pH$ in the stroma relative to thylakoid lumen occurs
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The $pH$ of both stroma and thylakoid luman becomes equal
When the light hits the chloroplast, the chemiosmotic potential is established by thylakoid membrane. The carriers in the electron transport chain use some of the electron’s energy to actively transport protons from the stroma to the lumen. During photosynthesis, the lumen becomes acidic, as low as pH 4, compared to pH 8 in the stroma. Therefore answer B is correct.