Do Aquatic Plants Use Photosynthesis? - YouTube
Plants need photosynthesis because the process fuels them with the energy that they require to survive
Are there any animals that use photosynthesis in the …
Another test uses a device called a fluorometer to measure the amount of chlorophyll in a sample. Because plankton have a relatively fixed ratio between the chlorophyll and carbon in their cells, knowing the chlorophyll concentration allows us to estimate the carbon value. This in turn gives us biomass—the size and number of phytoplankton in an area—which corresponds to the plants' primary productivity. This is the total amount of carbon and nitrogen that the plants were able to extract from seawater and incorporate into their tissues through photosynthesis and growth.
By Martin Schweig
My first interest in succulent plants developed because of their unique physical differences to most other botanical species. What I did not realize was how different they were in many other aspects of their existence.
Their basic biochemical process is somewhat different from the chemistry of most other plants. To survive in a dry environment with irregular or little rainfall, succulent plants must store water in their leaves, stems or roots. These plants often show specific adaptations in their metabolism.
As we know, plants produce food by photosynthesis, which is the bonding together of carbon dioxide with water to make sugar and oxygen using the sun's energy. Sugar contains the stored energy and serves as the raw material from which other compounds are made.
What I was not aware of is that there are at least three different pathways in which photosynthesis can occur to achieve the same results. They are known as C3, C4 and CAM, because the first chemical made by the plant is a three- or four-chain molecule.
C3 (normal conditions)
C4 (high temperature/high water/high light availability)
CAM (high temperature/low water availability)
CAM stands for crassulacean acid metabolism, after the plant family in which it was first discovered. It is essentially a means of isolating in time the carbon dioxide intake from sunlight-fueled photosynthesis. Acid is stored at night within the plant so that during the day it can be turned into sugars by photosynthesis.
All plants can use C3 photosynthesis, and some are able to use all three types. However, C4 and CAM do not exist in the same plant. It is interesting to note that the only cacti to use C3 photosynthesis is the primitive pereskia.
C4 and CAM photosynthesis are both adaptations to arid conditions, because they are more efficient in the conservation of water. CAM plants are also able to "idle," thus saving energy and water during periods of harsh conditions. CAM plants include many succulents such as Cactaceae, Agavacea, Crassulaceae, Euphorbiaceae, Liliaceae, Vitaceae (grapes), Orchidaceae and bromeliads.
CAM plants take in carbon dioxide during the night hours, fixing it within the plant as an organic acid with the help of an enzyme. During the daylight hours, CAM plants can have normal C3 metabolism, converting carbon dioxide directly into sugars or storing it for the next day's metabolism for use in the evening.
With the sun's energy during daylight, the stored organic acid is broken down internally with the help of enzymes to release carbon dioxide within the plant to make sugars. The stomata (pores) can be open during the evening when the temperature is lower and humidity relatively higher.
During the day, the stomata can remain closed, using the internally released carbon dioxide and thus sealing the plant off from the outside environment. This is probably a six to 10 times more efficient way to prevent water loss compared to normal plant respiration. This modified effect seems to work best when there is a considerable difference between daytime and nighttime temperatures.
C4 plants can photosynthesize faster under a desert's extreme heat than C3 plants, because they use extra biochemical pathways and anatomy to reduce photorespiration. Photorespiration basically occurs when the enzyme (rubisco) that grabs carbon dioxide for photosynthesis grabs oxygen instead, causing respiration that blocks photosynthesis and thus causes a slowing of the production of sugars.
The majority of plants fall into the C3 category and are best adapted to rather cool, moist temperatures and normal light conditions. Their stomata are usually open during the day.
When conditions are extremely arid, CAM plants can just leave their stoma closed night and day, and the organic cycle is fed by internal recycling of the nocturnally fixed respiratory carbon dioxide. Of course, this is somewhat like a perpetual motion machine, and because there are costs in running this machinery, the plant cannot CAM-idle for very long. This idling does, however, allow the plants to survive dry spells and recover quickly when water is again available. This is quite unlike plants that drop their leaves and go dormant during dry spells.
The following comparison of photosynthesis and respiration may be helpful.
13/01/2018 · Do fish use photosynthesis
The fact of the matter is, plants areincredibly special because only plants can dophotosynthesis. For this reason, every organism onearth ultimately relies on plants for its survival(with a few exceptions, which I'll discuss later).Even animals that eat only meat, hunting andcatching their food as prey, ultimately rely onplants for survival because the prey are eatingplants, or are eating insects that are eatingplants, or are eating animals that are eatinganimals that are eating plants, etc.
Photosynthesis is the ability of plants toabsorb the energy of light, and convert it intoenergy for the plant. To do this, plants havepigment molecules which absorb the energy of lightvery well. The pigment responsible for mostlight-harvesting by plants is chlorophyll, a greenpigment. The green color indicates that it isabsorbing all the non-green light-- the blues(~425-450 nm), the reds and yellows (600-700 nm). Red and yellow light is longer wavelength, lowerenergy light, while the blue light is higherenergy. In between the two is green light(~500-550 nm). It seems strange that plantswould harvest the lower energy red light insteadof the higher energy green light, unless youconsider that, like all life, plants first evolvedin the ocean. Sea water quickly absorbs thehigh-energy blue and green light, so that only thelower energy, longer wavelength red light canpenetrate into the ocean. Since early plants andstill most plant-life today, lived in the ocean,optimizing their pigments to absorb the reds andyellows that were present in ocean water was mosteffective. While the ability to capture thehighest energy blue light was retained, theinability to harvest green light appears to be aconsequence of the need to be able to absorb thelower energy of red light.
Plants use photosynthesis to build molecules and energy they can use.
Only plants can do photosynthesis.Photosynthesis is the process of harnessingenergy from sunlight to generate chemical energy,which can be stored and used later. Thisstored chemical energy comes from the conversionof inorganic carbon (carbon dioxide) into organiccarbon, or food. Every living thing needs a sourceof stored energy for survival, even plants! Thinkof the stored energy as a battery, which isproviding energy not just for muscle movement(which plants obviously don't worry about), butfor all of the essential processes of life (cellgrowth and repair, for example). Living thingsthat can not harness and store energy themselvesthrough photosynthesis (and this includes humans,animals, insects, bacteria, viruses) HAVE to usethe energy harnessed and stored by plants tosurvive, or their battery runs out. Only plantshave the ability to recharge the batteries, soliving organisms are dependent on plants. Theprocess that releases the energy stored in thesebatteries is called the Krebs cycle.
Like land plants, seagrasses use sunlight and to make food. Because photosynthesis requires light, they need to be close to the water’s surface. Seagrasses get nutrients from their roots, which also anchor them to the bottom. Therefore, seagrasses are found growing along coastlines where the water is shallow enough to allow the plants to get both the nutrients and the sunlight that they need.
Thus photosynthesis allows plants to use ..
What is the importance of photosynthesis in an …
but only a few are absorbed and used by chlorophyll, the energy-capturing molecule of photosynthesis
called “photosynthesis,” plants use the energy in sunlight to ..
Like land plants, seagrasses use sunlight and photosynthesis to make food
Organisms That Use Photosynthesis.
called “photosynthesis,” plants use the energy in sunlight to convert ..
Easy Science for Kids Photosynthesis: How Plants Make Food and Energy
One of our main goals in IVARS is to better understand how different groups of phytoplankton influence the cycling of carbon and other elements in the Ross Sea. We want to know which phytoplankton groups are here, how they're distributed in space and time, and how their differing photosynthetic activities influence biogeochemical cycles. Measuring the biochemistry and byproducts of photosynthesis is thus a key part of our work.
Photosynthesis is the process green plants use ..
You can thing of the Krebs cycle as theopposite of photosynthesis: a process whichreleases energy by converting organic matter backinto carbon dioxide.I like to think of life as a giant cycle ofcarbon. The carbon begins and ends the cycle inthe form of carbon dioxide but goes through manydifferent forms and transformations along the way:photosynthesis converts the carbon dioxide intoplant matter, which is passed along the food chainas organic carbon and eventually the Krebs cycleconverts this organic carbon (which is now grassor cow or tiger or grasshopper) back into carbondioxide and the whole thing begins again.
All plants can use C3 photosynthesis, ..
We use several different tests for analyzing the photosynthetic machinery and its products. A recap of photosynthetic chemistry helps explain them. In general, photosynthesis can be described by a chemical equation in which plants use light-sensitive pigments to capture the energy of sunlight. They use this energy to convert water and carbon dioxide into carbohydrates and oxygen:
Overall equation for the type of photosynthesis that occurs in plants
So I said with a VERY small exception, everyliving thing relies on plant matter for survival. Some special bacteriathat live deep in the ocean, far away fromsunlight, have evolved the ability to convertcarbon dioxide into organic matter (store energy)without using energy from sunlight. These bacteria storeenergy from chemical reactions, a process which isless efficient than storing energy from sunlightbut since there's no sunlight, it's the only wayof harnessing and storing energy (recharging thebatteries). This process is not calledPHOTOsynthesis (the synthesis of organicmatter from light energy) butCHEMOsynthesis (the synthesis of organicmatter from chemical energy). These specialbacteria are kept as symbionts inside the bodiesof deep-sea animals, so some deep-sea communitiesdo not rely on plant matter. Other deep-seacommunities do, however.
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