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Variegated leaves are leaves that contain both green patches with chlorophyll and non-green patches without chlorophyll, such as those of Coleus or Croton.The optimum temperature range for the process of photosynthesis is between 20°C and 30°C.The edges of bell jars are sealed with grease to make the experimental setups completely air-tight and prevent external gases from entering.Stomata act as passages for carbon dioxide to enter the leaf from the atmosphere and for oxygen to exit the leaf into the atmosphere.Plants absorb dissolved nitrogen compounds from the soil through their roots to synthesize amino acids and proteins.The chemical equation is: Carbon Dioxide + Water in the presence of Sunlight and Chlorophyll yields Glucose and Oxygen.Autotrophic nutrition is the process of nutrition in which organisms take in inorganic substances to synthesize their own organic food.Stomata close at night when there is no light for photosynthesis in order to prevent excess water loss through transpiration.The rate of photosynthesis is highly affected by light quality, being maximum in blue and red light and minimum in green light.Photosynthesis takes place within the chloroplasts, which contain the light-trapping green pigment called chlorophyll.Keeping the plant in the dark for 48 hours destarches the leaves by forcing the plant to consume its stored starch, making it starch-free for the experiment.The raw materials required by green plants for photosynthesis are carbon dioxide from the air and water from the soil.Sir Jagdish Chandra Bose is famous for proving that plants have life, feel pain, and show parallelism to animals, as well as inventing the crescograph.The final products formed during photosynthesis are glucose, which is stored or used as energy, and oxygen, which is released into the atmosphere.The gas can be tested by inserting a glowing splinter into the tube, which will burst into a bright flame if oxygen is present.If the carbon dioxide concentration exceeds 0.1% in the air, the rate of photosynthesis begins to decrease.Leaves are broad and flat to maximize the surface area exposed to sunlight and to absorb carbon dioxide efficiently.An aquatic plant like Hydrilla is used because it releases oxygen bubbles directly into the surrounding water, making the gas evolution easy to observe and collect.The rate of photosynthesis slows down at high temperatures because the enzymes involved in the process are proteins and get denatured.Solar energy is the ultimate source of energy because it is captured by green plants to produce the food and oxygen that sustain all other life forms on Earth.
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Chapter: 04. Photosynthesis
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