Life Processes Worksheet-5
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Respiration is a vital process for all organisms. Explain.
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What is photolysis of water?
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Where do the light and dark reactions take place?
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What is the most important event in photo-synthesis ?
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Where are the photosynthetic pigments located in a chloroplast?
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Name the only natural process that gives out oxygen for respiration of all living organisms.
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Name the two principal forms of chlorophyll that take part in photosynthesis of higher plants.
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Give the currently accepted equation of photo-synthesis.
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What is the specific function of light energy in the process of photosynthesis?
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All life on earth would come to an end if there were no green plants. Give reason.
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Explain why respiration is said to be the reversal of photosynthesis.
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How does sunlight affect photosynthesis?
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What is the optimum temperature for photosynthesis?
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What is NADPH?
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What are the functions of saliva?
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Name one gland in human body which secretes digestive enzyme as well as hormone.
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Name the three pairs of salivary glands of man.
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Name the different parts of the small intestine in proper sequence.
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How does the bile secreted from liver reach the duodenum?
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How is the action of ptyalin stopped in the stomach?
Answer:
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All living organisms need energy for the various metabolic activities. Respiration provides energy for this and so it is a vital process.
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The splitting of water molecules with the help of solar energy by the chloroplast is known as photolysis of water. Water is split into H+ and OH– ions during light reaction. ions during light reaction.
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Light reaction, i.e., photolysis of water takes place in granum of chloroplast while Dark reaction takes place in stroma of chloroplast.
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The trapping of solar energy by the chloroplast is the most important unique event in photosynthesis.
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Photosynthetic pigments are located in the lipid portion of thylakoid membranes in a chloroplast.
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Photosynthesis.
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Chlorophyll-a and Chlorophyll-b
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To activate chlorophyll.
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Photosynthesis releases oxygen which is a life supporting gas. Only in green plants photosynthesis takes place.
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Respiration is a catabolic process while photosynthesis is an anabolic process. During respiration CO2 is given out while during photosynthesis O2 is given out.
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Light provides energy for photosynthesis. Light intensity is proportional to photosynthesis.
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30-35°C is the optimum temperature needed for photosynthesis.
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NADPH is called reduced NADP.
NADP + Hydrogen + Energy → NADPH
NADPH acts as a carrier of hydrogen.
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The functions of saliva are:
(i) The mucin of saliva lubricates the food for swallowing.
(ii) The enzyme salivary amylase or ptyalin present in saliva helps in the digestion of starch.
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Pancreas.
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The three pairs of salivary glands are sublingual, submandibular and parotid.
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Duodenum, Jejunum and Ileum.
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The bile passes from the liver through hepatic ducts to the common bile duct which opens into the duodenum.
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In the stomach, the hydrochloric acid of the gastric juice destroys all ptyalin in a short time.