#6 What pigment is in the chloroplast? What happens when sunlight hits this pigment?
#6 answer Chlorophyll When light hits the chlorophyll green light is reflected and other wavelengths of light are absorbed causing electrons in the chlorophyll to get excited which gets the process of photosynthesis going.
#7 If a snail, elodea, water and bromothymol blue are put into a test tube and left in the light – what will happen and WHY? What will happen if this same test tube is put in the dark and WHY?
#7 answer The snail will make carbon dioxide and the elodea will use the carbon dioxide so the BTB should not change color. The snail will make carbon dioxide BUT the elodea will be unable to photosynthesize so the BTB will turn yellow.
#8 What will happen to a plant if you shine only red light on it for a long period of time – what color will it appear to be and will it survive. What will happen if you shine green light on it for a long period of time – what color will it appear to be and will it survive?
#8 answer Black, it will survive because it is absorbing light Green, it will die because it is not absorbing any light
#9 Do the following happen during the light or the dark reactions of photosynthesis? 1.Water is split into hydrogen, oxygen, and electrons 2.Carbon dioxide enters the plant 3.Electrons are excited 4.The Calvin cycle
#15 1.What is the difference between aerobic and anaerobic respiration? 2.Give two examples of anaerobic respiration. 3.Why is there less energy produced in anaerobic respiration?
#15 answer 1.Aerobic is with oxygen, is more efficient yielding more energy. Anaerobic is without oxygen, is less efficient and yields less energy. 2.Alcoholic Fermentation, Lactic acid fermentation, and some bacteria use nitrates or sulfates instead of oxygen. 3.There is less energy in anaerobic respiration because the glucose molecule is not completely broken down.
#16 Trace the flow off energy in the following: house plant, fly eating the house plant, sun, coal (burned to make electricity), light bulb, pre-historic plants.
#17 Explain how the food you eat is turned into energy. In your explanation be sure to include the organelle involved.
#17 answer Food goes through the digestive system where it is broken down into glucose. The glucose enters the blood stream in your small intestine. Glucose and oxygen (from lungs) travels through your blood to all the cells in your body. Glucose and oxygen enter your cells by diffusion. Glucose and oxygen go to the mitochondria of your cells where the bonds holding the carbon, oxygen and hydrogen together are broken creating energy (ATP), carbon dioxide and water.
#18 Why do muscles begin to cramp after prolonged intense exercise?
#18 answer The muscle cells do not receive enough oxygen and therefore cannot completely break down the glucose into carbon dioxide and water. Instead glucose is broken into lactic acid which builds up in the muscles making them sore.
#19 How are solar panels and photosynthesis similar?
#19 answer In solar panels sunlight is absorbed by first exciting electrons in the crystals of the panel. Instead of storing that energy as a sugar the energy is used as or stored as electricity.
#20 Compare and contrast cellular respiration and photosynthesis. List at least three things that are similar and three things that are different.
#20 answer SimilaritiesDifferences Both use an organelle that has increased surface area Photosynthesis occurs in the chloroplast, Cellular respiration in the mitochondria Both have a cycle (Calvin cycle and Krebs cycle) Photosynthesis stores energy, cellular respiration releases energy Both are biochemical pathways. Photosynthesis’ products are cellular respiration’s reactants.
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