Carbon dating exam with 100% correct answers 2024

1 half life: will have half the amount of carbon 14 it started with. 5370 years. 2nd half life: will have about a quarter(quarter of element present). 11460 years. 3rd half life: eigthh of elements present. 17190 years. When cosmic rays hit nitrogen atoms (n14, it then turns to c14. correct answers Plants and co2 correct answers Plants use energy from sunlight to fuse a molecule of CO2 to a molecule of water, H2O, to form carbohydrates. One molecule of oxygen O2 is released to the air for each CO2 molecule removed. Biological machinery of plants reworks the carbohydrate polymers into proteins, oils and other molecules of life Plants, through photosynthesis, and soils sequester roughly a third of carbon dioxide emissions released into the atmosphere each decade from the burning of fossil fuels. During photosynthesis, plants open tiny pores on their leaf surfaces to suck carbon dioxide from the air and produce their own food. During their lifetimes, plants generally give off about half of the carbon dioxide (CO2), that they absorb, although this varies a great deal between different kinds of plants. Once they die, almost all of the carbon that they stored up in their bodies is released again into the atmosphere. While some crop yields may increase, rising CO2 levels affect the level of important nutrients in crops. With elevated CO2, protein concentrations in grains of wheat, rice and barley, and in potato tubers decreased by 10 to 15 percent in one study. Thus, the study found most effective plant for absorbing carbon dioxide (CO2) and reducing carbon footprint is a prayer plant, a member of the Calathea family. The prayer plant took in 14.4% of the total CO2 in the chamber, which is about 0.0003kg. And the least air purifying houseplant considered is the spider plant. Plants can also help manage carbon dioxide levels. Dr Torpy's research group analysed the effect of indoor plants on air quality in workplaces and found that in offices with plants, CO2 levels reduced by about 10 per cent in an air-conditioned building and 25 per cent in a building without air-conditioning In fact, research shows that too much CO2 in our bedrooms could lead Photosynthesis correct answers Carbon dioxide (CO2)is an essential component of photosynthesis (also called carbon assimilation). Photosynthesis is a chemical process that uses light energy to convert CO2 and water into sugars in green plants. These sugars are then used for growth within the plant, through respiration