1) What is the role of stomata, chlorophyll and sunlight in photosynthesis
2) Explain any 4 singnificances of photosynthesis
3) List any 4 differences between photosynthesis and respiration.
4) What is Insectivorous plants? Give examples of two Insectivorous plants, and explain their adaptations for capturing insects.
5) Describe an experiment to prove that oxygen is released during photosynthesis.
Answers
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1)- Light energy is absorbed by chlorophyll, a photosynthetic pigment of the plant, while air containing carbon dioxide and oxygen enters the plant through the leaf stomata. An extremely important by-product of photosynthesis is oxygen, on which most organisms depend
2)- Significance of photosynthesis-
•Photosynthesis is a physiological process which serves as the driving and vital force to obtain food and fuel for all non-photosynthetic organisms in universe.
•Organic (carbohydrates) obtained by photosynthesis are basically used to synthesise fats, proteins, nucleoproteins, pigments, enzymes, vitamins, cellulose, organic acids etc.
•Carbohydrates synthesised during dark reaction of photosynthesis become structural parts of the organisms.
•In the process, solar energy is converted into chemical energy by utilizing simple raw materials like CO2 and H2O.
3)- Photosynthesis Respiration
It takes place only in the presence of sunlight. It continues throughout day and night, in sun and darkness.
It occurs only in the green cells of the plant. It occurs in all the cells of an organism.
It is an endothermic reaction as it absorbs sunlight. It is an exothermic reaction, as it gives out energy.
It utilises carbon dioxide and water. It evolves carbon dioxide and water.
It builds up complex compounds such as carbohydrates from simple inorganic compounds. So, it is an anabolic process. It breaks complex substances into simple substances. So, it is a catbolic process.
It converts light energy into chemical energy. It releases potential or chemical energy which is used variously in the body.
4)- These plants grow in humid areas, where plenty of sunlight and moisture is found. They are found in the nitrogen deficient soil. That is why they trap and digest insects to absorb nutrients. Venus flytrap, pitcher plant and cobra lily are some of the insectivorous plants' names.
5)- A beaker is filled with water and twigs of Hydrilla are inserted in the funnel so that the cut ends are in the tube of the funnel and the funnel is put in the water. ... Air bubbles from the plant collect at the tip of the tube. This experiment demonstrates that oxygen is evolved during photosynthesis.
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