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KS3 biology Quiz on "PLANTS and PHOTOSYNTHESIS" …

Photosynthesis consists of light-dependent and light-independent reactions.

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do plants perform photosynthesis at night? | Yahoo …

Perhaps a few hundred million years after the first mitochondrion appeared, as the oceanic oxygen content, at least on the surface, increased as a result of oxygenic photosynthesis, those complex cells learned to use oxygen instead of hydrogen. It is difficult to overstate the importance of learning to use oxygen in respiration, called . Before the appearance of aerobic respiration, life generated energy via and . Because oxygen , aerobic respiration generates, on average, about per cycle as fermentation and anaerobic respiration do (although some types of anaerobic respiration can get ). The suite of complex life on Earth today would not have been possible without the energy provided by oxygenic respiration. At minimum, nothing could have flown, and any animal life that might have evolved would have never left the oceans because the atmosphere would not have been breathable. With the advent of aerobic respiration, became possible, as it is several times as efficient as anaerobic respiration and fermentation (about 40% as compared to less than 10%). Today’s food chains of several levels would be constrained to about two in the absence of oxygen. Some scientists have and oxygen and respiration in eukaryote evolution. is controversial.

Hence photosynthesis and respiration lie on complete opposite ends of the spectrum.

I heard something called CAM photosynthesis, or Crassulacean-Acid metabolism in which the stomata in the leaves of certain plants open at night to minimize water loss. CO2 is acquired at this time, and stored in vacuoles as malate.

13/02/2007 · do plants perform photosynthesis at night

I believe that it is not possible for any plant to give off O2 when it cannot do photosynthesis.

Moore, et al. point to Flaveria (Asteraceae), Panicum (Poaceae) and Alternanthera (Amarantheceae) as genera that contain species that are intermediates between C3 and C4 photosynthesis. These plants have intermediate leaf anatomies that contain bundle sheath cells that are less distinct and developed than the .

Photosynthesis occurs inside chloroplasts. Chloroplasts contain chlorophyll, a green pigment found inside the thylakoid membranes. These chlorophyll molecules are arranged in groups called photosystems. There are two types of photosystems, Photosystem II and Photosystem I. When a chlorophyll molecule absorbs light, the energy from this light raises an electron within the chlorophyll molecule to a higher energy state. The chlorophyll molecule is then said to be photoactivated. Excited electron anywhere within the photosystem are then passed on from one chlorophyll molecule to the next until they reach a special chlorophyll molecule at the reaction centre of the photosystem. This special chlorophyll molecule then passes on the excited electron to a chain of electron carriers.

Can plants photosynthesize at night

In this article the CAM photosynthetic pathway and CAM plants are discussed.

As oxygenic photosynthesis spread through the oceans, everything that could be oxidized by oxygen was, during what is called the (“GOE”), although there may have been multiple dramatic events. The event began as long as three bya and is . The ancient carbon cycle included volcanoes spewing a number of gases into the atmosphere, including hydrogen sulfide, sulfur dioxide, and hydrogen, but carbon dioxide was particularly important. When the continents began forming, carbon dioxide was removed from the atmosphere via water capturing it, , the carbon became combined into calcium carbonate, and plate tectonics subducted the calcium carbonate in the ocean sediments into the crust, which was again released as carbon dioxide in volcanoes.

About the time that the continents began to grow and began, Earth produced its first known glaciers, between 3.0 and 2.9 bya, although the full extent is unknown. It might have been an ice age or merely some mountain glaciation. The , and numerous competing hypotheses try to explain what produced them. Because the evidence is relatively thin, there is also controversy about the extent of Earth's ice ages. About 2.5 bya, the Sun was probably a little smaller and only about as bright as it is today, and Earth would have been a block of ice if not for the atmosphere’s carbon dioxide and methane that absorbed electromagnetic radiation, particularly in the . But life may well have been involved, particularly oxygenic photosynthesis, and it was almost certainly involved in Earth's first great ice age, which may have been a episode, and some pertinent dynamics follow.

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  • does photosynthesis occur at night? how? and can you …

    Leaf poreson plants open up to allow photosynthesis during the daytime and closeat night to reduce water losses.

  • does photosynthesis occur at night

    respiration and photosynthesis review reminds me of elementary school before looking for as it is today.

  • Do plants perform photosynthesis at night | scholarly …

    These are the bundle sheath cells (BSC) and in a C4 plant it is where the photosynthesis takes place (see photo p13).

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Do plants perform photosynthesis at night

In a striking similarity to the of evolutionary innovations, many human traits are vestiges of our history but have yet to disappear, but various social managers have used them to exploit the masses. For instance, the has a and developed because those were the most energy-rich foods that existed. But the incredibly high sugar and fat content of processed food vended by Western agribusiness companies plays to those biological proclivities in the name of profit. Diets based on such foods are disastrous for human health, and industrialized peoples, led by the USA, are the . Similarly, in-group "loyalty" (to fight the out-group) is a that arose to ensure survival. Ever since the , a goal of social managers has been forming that in-group cohesion to battle the out-group. There is not much sentient about it. As the and have made clear, people can be arbitrarily split along almost any lines and form an in-group and out-group, and the out-group will then be treated terribly. Darwin's "from the war of nature" comes "higher animals" conclusion in his is mirrored in the work of Marx and Hitler, in that they believed that human "progress" was produced by one social group violently prevailing over another. Hitler avidly read Marx, and may be how he received his "revolutionary" ideas.

and finishing the photosynthesis by night when the stomates can be ..

was the capitalist epitome in North America’s British colonies, but his fortune was significantly amassed by running ads to capture runaway slaves and by . When the began its power play, the local newspaper reporting on the illegal proceedings was , in an early instance of capitalist censorship of the “free press.” Private “free market” censorship has always been the preferred method of capitalists, not governmental intervention, such as the way that .

plants and algae can undergo photosynthesis ..

In the Eastern Woodlands of North America, natives began domesticating plants before 2500 BCE. It may well be an independent domestication event. Those horticulturalists largely became matrilineal societies. The was succeeded by the , in which maize seems to have made its way from Mesoamerica. Around 500 CE, the , the bow and arrow supplanted the spear and atlatl, and the "" - maize, beans, and squash - began dominating food production. When the began around 800 CE, intensive maize production began and spread, which led to rapid population growth and the rise of , which led to the only pre-Columbian North American city, at , which collapsed, almost certainly from environmental over-taxation and a cooling climate, before 1400 CE. The mound-building Mississippian culture had a familiar trajectory, as intensive agriculture led to an agricultural surplus. Men, who controlled the surplus and rose to dominance, commandeered the local religion into granting them divine status or sanction and erected monumental architecture to themselves and their divine yet invisible patrons. As in , they made their structures from earth instead of stone. Soil fertilization for maize-growing was not practiced, which rapidly depleted the soils (there were no domestic animals to provide manure, and the Indians did not adopt the night soil practices of East Asia), and the cooling of the , along with declining soil fertility, spelled the decline of Mississippian culture before Europe's first invasions of the Columbian era. The and its aftermath was a catastrophe for Mississippian peoples. Later European invaders . By the 1600s, when England began invading the Eastern Woodlands, the Mississippian culture had vanished, and by the late 1700s, the Southeastern Indians not only retained no memory of who made those mounds that they lived near, they also had no memory of the social order that built them. The Cherokee seemed to retain some vestigial memory of Mississippian culture, as they had stories of despotic Indians that the Cherokee annihilated, but the mounds had become the source of a myth that spirit warriors lived in the mounds and could issue forth and fight Cherokee enemies.

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