What is ment by photosynthesis?

Question

What is ment by photosynthesis?

Answer 1

plants getting life from the sunshine...

and get the green colour for their leaves...

without this plants will die...

Answer 2

plants  make there  own  food  with  the help of  water,sunlight     is called  photo synthesis

Answer 3

The synthesis of glucose from carbon dioxide and water by harnessing light energy.

Answer 4

The raw materials are carbon dioxide and water; the energy source is sunlight; and the end-products are oxygen and (energy rich) carbohydrates, for example sucrose, glucose and starch. This process is arguably the most important biochemical pathway,[1] since nearly all life on Earth either directly or indirectly depends on it. It is a complex process occurring in higher plants, algae, as well as bacteria such as cyanobacteria

Answer 5

Photosynthesis is a series of enzyme-catalysed steps for the the conversion of light energy into chemical energy by living organisms. Its initial substrates are carbon dioxide and water; the energy source is light (electromagnetic radiation); and the end-products are oxygen and (energy-containing) carbohydrates, such as sucrose, glucose or starch. This process is arguably the most important biochemical pathway since nearly all life on Earth either directly or indirectly depends on it. It is a complex process occurring in higher plants, algae, as well as bacteria such as cyanobacteria. Photosynthetic organisms are also referred to as photoautotrophs

The word comes from the Greek φώτο- (photo-), "light," and σύνθεσις (synthesis), "placing with."

Photosynthesis uses light energy and carbon dioxide to make triose phosphates (G3P). G3P is generally considered the first end-product of photosynthesis.[citation needed] It can be used as a source of metabolic energy, or combined and rearranged to form monosaccharide or disaccharide sugars, such as glucose or sucrose, respectively, which can be transported to other cells, stored as insoluble polysaccharides such as starch, or converted to structural carbohydrates, such as cellulose or glucans.

A commonly used slightly simplified equation for photosynthesis is:

6 CO2(g) + 12 H2O(l) + photons → C6H12O6(aq) + 6 O2(g) + 6 H2O(l)

carbon dioxide + water + light energy → glucose + oxygen + water

When written as a word equation, light energy appears above the arrow, as it is required for photosynthesis, but it is not a reactant. Here the monosaccharide, glucose, is shown as a product, although the biosynthetic pathways in plants produce disaccharides.[citation needed]

The equation is often presented in introductory chemistry texts in an even more simplified form as:[2]

6 CO2(g) + 6 H2O(l) + photons → C6H12O6(aq) + 6 O2(g)

Photosynthesis occurs in two stages. In the first stage, light-dependent reactions or photosynthetic reactions (also called the Light Reactions) capture the energy of light and use it to make high-energy molecules. During the second stage, the light-independent reactions (also called the Calvin-Benson Cycle, and formerly known as the Dark Reactions) use the high-energy molecules to capture and chemically reduce carbon dioxide (CO2) (also called carbon fixation) to make the precursors of carbohydrates.

In the light reactions, one molecule of the pigment chlorophyll absorbs one photon and loses one electron. This electron is passed to a modified form of chlorophyll called pheophytin, which passes the electron to a quinone molecule, allowing the start of a flow of electrons down an electron transport chain that leads to the ultimate reduction of NADP to NADPH. In addition, this creates a proton gradient across the chloroplast membrane; its dissipation is used by ATP Synthase for the concomitant synthesis of ATP. The chlorophyll molecule regains the lost electron from a water molecule through a process called photolysis, which releases a dioxygen (O2) molecule.

In the Light-independent or dark reactions the enzyme RuBisCO captures CO2 from the atmosphere and in a process that requires the newly formed NADPH, called the Calvin-Benson Cycle releases three-carbon sugars, which are later combined to form sucrose and starch.

Photosynthesis may simply be defined as the conversion of light energy into chemical energy by living organisms. It is affected by its surroundings, and the rate of photosynthesis is affected by the concentration of carbon dioxide in the air, the light intensity, and the temperature.

Photosynthesis uses only 1% of the entire electromagnetic spectrum, and 2% of the visible spectrum. It has been estimated that the productivity of photosythesis is 115 petagrams (Pg, equals 1015 grams or 109 metric tons). Both land and ocean are equally productive, albeit the land has more biomass. This is due to ocean organisms that consume carbon to recycle it.

In plants

Most plants are photoautotrophs, which means that they are able to synthesize food directly from inorganic compounds using light energy - for example from the sun, instead of eating other organisms or relying on nutrients derived from them. This is distinct from chemoautotrophs that do not depend on light energy, but use energy from inorganic compounds.

6 CO2 + 12 H2O → C6H12O6 + 6 O2 + 6 H2O

The energy for photosynthesis ultimately comes from absorbed photons and involves a reducing agent, which is water in the case of plants, releasing oxygen as product. The light energy is converted to chemical energy (known as light-dependent reactions), in the form of ATP and NADPH, which are used for synthetic reactions in photoautotrophs. The overall equation for the light-dependent reactions under the conditions of non-cyclic electron flow in green plants is

2 H2O + 2 NADP+ + 2 ADP + 2 Pi + light → 2 NADPH + 2 H+ + 2 ATP + O2

Most notably, plants use the chemical energy to fix carbon dioxide into carbohydrates and other organic compounds through light-independent reactions. The overall equation for carbon fixation (sometimes referred to as carbon reduction) in green plants is

3 CO2 + 9 ATP + 6 NADPH + 6 H+ → C3H6O3-phosphate + 9 ADP + 8 Pi + 6 NADP+ + 3 H2O

To be more specific, carbon fixation produces an intermediate product, which is then converted to the final carbohydrate products. The carbon skeletons produced by photosynthesis are then variously used to form other organic compounds, such as the building material cellulose, as precursors for lipid and amino acid biosynthesis, or as a fuel in cellular respiration. The latter occurs not only in plants but also in animals when the energy from plants gets passed through a food chain. Organisms dependent on photosynthetic and chemosynthetic organisms are called heterotrophs. In general outline, cellular respiration is the opposite of photosynthesis: Glucose and other compounds are oxidized to produce carbon dioxide, water, and chemical energy. However, the two processes take place through a different sequence of chemical reactions and in different cellular compartments.

Plants absorb light primarily using the pigment chlorophyll, which is the reason that most plants have a green color. The function of chlorophyll is often supported by other accessory pigments such as carotenes and xanthophylls. Both chlorophyll and accessory pigments are contained in organelles (compartments within the cell) called chloroplasts. Although all cells in the green parts of a plant have chloroplasts, most of the energy is captured in the leaves. The cells in the interior tissues of a leaf, called the mesophyll, can contain between 450,000 and 800,000 chloroplasts for every square millimeter of leaf. The surface of the leaf is uniformly coated with a water-resistant waxy cuticle that protects the leaf from excessive evaporation of water and decreases the absorption of ultraviolet or blue light to reduce heating. The transparent epidermis layer allows light to pass through to the palisade mesophyll cells where most of the photosynthesis takes place.

Plants convert light into chemical energy with a maximum photosynthetic efficiency of approximately 6%.[ By comparison solar panels convert light into electric energy at a photosynthetic efficiency of approximately 10-20%. Actual plant's photosynthetic efficiency varies with the frequency of the light being converted, light intensity, temperature and proportion of CO2 in atmosphere.

Answer 6

procees of production of food with help of chlorophyll, carbon dioxide and water in presence of sunlight (naturally by green plants)

Answer 7

leaf makes their food with the help of water,sunlight oxygen and chlorophyll. this proses called photosynthesis.

Answer 8

Photosynthesis is an anabolic endergonic redox process by which green plants capture convert and conserve solar energy using CO2 and H2O as raw materials

Answer 9

Photosynthesis is the process by which light energy (from the sunlight) is converted to chemical energy by the plants. This chemical energy works as fuel for the survivial and growth of the plant. This energy is stored in bonds of sugar.

This process occurs in plants and some algae (Kingdom Protista). Plants need only light energy, CO2, and H2O to make sugar. The process of photosynthesis takes place in the chloroplasts, specifically using chlorophyll, the green pigment involved in photosynthesis.

Answer 10

photosynthesis is a plant using basically nutrients, carbon dioxide , water and sunlight to make C6H12O6, more commonly known as glucose. this is very much simplified.

Answer 11

The process of peparing food by the plants and trees with the presence of sunlight,water,carbondioxide and mainly due to the presence of chlorophyl in the leaves which help in making there food is known as photosynthesis.

Answer 12

The process by which green plants use carbon dioxide, water and sunlight to make their own food. (Pretty much it means the process at which a plant makes food.)