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2021-05-14

When a filament of algae is illuminated with light that is passed through a prism?

When a filament of algae is illuminated with light that is passed through a prism?

Question: 1. When A Filament Of Algae Is Illuminated With Light That Is Passed Through A Prism, Different Segments Of Algae Are Exposed To Different Wavelengths Of Light. When Aerobic Bacteria Are Present, They Congregate In Highest Concentrations In The Areas Illuminated By The Red And Blue Light.

Why did Engelmann conclude that cells illuminated by blue and red light were releasing the most oxygen?

What did Engelmann conclude about the congregation of bacteria in the red and blue areas? Bacteria congregated in these areas because these areas had the most oxygen being released. the relationship between wavelengths of light and the rate of photosynthesis.

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Who was Engelmann and how did he use a prism?

1. Engelmann passed white light through a prism and exposed a filament of alga to the different wavelengths of the visible light spectrum. 2. He placed aerobic bacteria (require O2) with the alga to determine which segments of the alga were performing the most photosynthesis and thus releasing the most oxygen.

Why was Engelmann’s use of a prism with natural sunlight a key to his discovery?

In Engelmann’s experiment, he used aerotactic (oxygen-seeking) bacteria to determine which wavelengths of visible light were most effective in driving the reactions of photosynthesis in green algae. First, Engelmann used a prism to disperse white light from the sun into the colors (wavelengths) of the visible spectrum.

Which wavelength of light is best absorbed by chlorophyll b?

In the case of chlorophyll a the maximal absorption in the red region is at 642 nm and in the blue region at 372 nm; for chlorophyll b the values are 626 nm and 392 nm, respectively.

What are the 3 products of light reaction?

Light reactions harness energy from the sun to produce chemical bonds, ATP, and NADPH. These energy-carrying molecules are made in the stroma where carbon fixation takes place. The light-independent reactions of the Calvin cycle can be organized into three basic stages: fixation, reduction, and regeneration.

What two products of light reactions are used up?

What two products of the light reactions are used up in the calvin cycle? NADPH, which is an electron carrier and can be reused, and ATP, or ADP, which is an energy molecule that can be rebuilt in another light reaction.

What comes out the light dependent?

The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. In plants, the light reactions take place in the thylakoid membranes of organelles called chloroplasts.

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What are the raw materials needed in the light dependent reaction?

CO2, water, light, and chlorophyll are the raw materials for photosynthesis. But, in case of light dependent reaction or light reaction of photosynthesis, it is most influenced by presence or absence of light.

Do the different colors or pigments matter in terms of how light energy is absorbed?

Chlorophyll, the green pigment common to all photosynthetic cells, absorbs all wavelengths of visible light except green, which it reflects to be detected by our eyes. Black pigments absorb all of the wavelengths that strike them. White pigments/lighter colors reflect all or almost all of the energy striking them.

How many steps does glycolysis pathway produce ATP?

10 steps

What is the main final product of the Calvin cycle?

glucose

What is the difference between cyclic and noncyclic electron flow?

As the name suggests, in cyclic photophosphorylation the electrons move in a circular pattern. Electron movement is non-cyclic in noncyclic photophosphorylation. *Photophosphorylation: The addition of phosphate group in the presence of light during the light reaction of photosynthesis is called photophosphorylation.

What is the noncyclic pathway?

In the non-cyclic pathway, when photosystem I receives electrons from the electron transport chain, it re-energizes them. Those electrons then pass through another electron transport chain until they are accepted by NADP+.

Which of the following is the main difference between cyclic and noncyclic Photophosphorylation?

So in non-cyclic photophosphorylation, you make oxygen, from splitting the water molecule, you make ATP using the H+ ions and you make NADPH. In cyclic photophosphorylation, you only use photosystem I. There is no splitting of water – the electrons only come from the light harvesting complex.

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What is the purpose of cyclic electron flow?

In higher plants, the generation of proton gradient across the thylakoid membrane (ΔpH) through cyclic electron flow (CEF) has mainly two functions: (1) to generate ATP and balance the ATP/NADPH energy budget, and (2) to protect photosystems I and II against photoinhibition.

Why are algae different colors?

All algae contain chlorophyll. Some algae have pigments that mask the green chlorophyll. Algae exhibits different color variations because of the other photosynthetic pigments they contain. The major algae divisions can, for the most part, be drawn based on the algae’s predominant apparent color.

Why are most leaves green in color?

So, plants and their leaves look green because the “special pair” of chlorophyll molecules uses the red end of the visible light spectrum to power reactions inside each cell. The unused green light is reflected from the leaf and we see that light.

Why plants do not absorb green light?

Short answer: plant absorbs mostly “blue” and “red” light. They rarely absorb green for its mostly reflected by plant, that makes them green! Long answer : Photosynthesis is the ability of plants to absorb the energy of light, and convert it into energy for the plant.

What will happen if plants are exposed to green light?

Answer: Most colors of light are absorbed, but the green color is reflected. What would happen if a plant were exposed ONLY to green light? Why? Answer: Because plants reflect green light, they would have a difficult time collecting enough light to perform photosynthesis.

Which leaves and stems are greener in color Why?

The reflected colors are what give pigments their color. Chlorophyll pigments are green because they reflect green light. Most land plants are green (their stems and leaves, anyway) because the accessory pigments are chlorophylls, including chlorophyll-b and chlorophyll-c.