NOVA - Official Website | Illuminating Photosynthesis NOVA - Official Website | Illuminating Photosynthesis

Leaf photosynthesis and respiration, plant pigments and photosynthesis

In scientific equations, photosynthesis takes carbon dioxide from the air, water and sunlight to create sugar. The antenna system is at the core of the chlorophyll molecule of the photosystem II reaction center.

Oxygen is a waste product of light-dependent reactions, but the majority of organisms on Earth use oxygen for cellular respirationincluding photosynthetic organisms. Leaf photosynthesis and respiration the non-cyclic reaction, the photons are captured in the light-harvesting antenna complexes of photosystem II by chlorophyll and other accessory pigments see diagram at right.

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The photosynthetic action spectrum depends on the type of accessory pigments present. This lab compares the production of starch in leaves kept in the light and those in the dark. This occurred independently in several separate lineages of vascular plants, in progymnosperms like Archaeopterisin Sphenopsidaferns and later in the gymnosperms and angiosperms.

The parts above the soil get their oxygen directly from the air through pores.

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The transparent epidermis layer allows light to pass through to the palisade mesophyll cells where most of the photosynthesis takes place. In order to study respiration in green plants we must block out the light, because although green plants respire all the time they only photosynthesize in the light.

Links Aerobic and anaerobic respiration animations: It is often the location of a bud.

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In " The Heat is On - The Energy Stored in Food " students will burn several types of nuts and snack foods in order to determine their heat content per gram. The plant takes in the energy from the light and carbon dioxide to produce its 'food' and as a result oxygen is given out as a by product.

Respiration is the breakdown of glucose to make energy using oxygen. Photosynthesis is the plant process where light energy is used to generate the production of ATP.

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After the photosynthesis happens, then the cells in the plant use cellular respiration to turn this food into energy that the plant can actually use. Cellular respiration takes place inside the mitochondria, which are the organelles that are able to break down glucose.

They serve primarily as protection for the rest of the leaf.

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That photo receptor is in effect reset and is then able to repeat the absorption of another photon and the release of another photo-dissociated electron. Photosynthesis does the opposite of respiration. There it is further excited by the light absorbed by that photosystem.

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The mesophyll cells have chloroplasts and this is where photosynthesis occurs. The plant must therefore bring these three ingredients together in the leaf for photosynthesis to take place.

Photosynthesis needs energy from the light in order to start the whole process.