Q. 94.8( 4 Votes )
What are the adaptations of leaf for photosynthesis?
• Leaves contain chloroplasts which store chlorophyll which is a necessary pigment for photosynthesis.
(reason: Chloroplasts are a kind of cell organelle which store the pigment chlorophyll which helps in photosynthesis. Photosynthesis doesn’t take place without this pigment.)
• Leaves also contain stomata which are pores which help in gaseous exchange of carbon dioxide and oxygen.
(reason: Stomata are pores on the leaves which are minute openings guarded by bean shaped cells called guard cells. The opening and the closing of stomata lets in and gives out oxygen and carbon dioxide which is highly necessary for photosynthesis to take place.)
• Leaves also have an elaborate network of veins for circulation and distribution of food and water.
(reason: Veins are tubular pathways for the movement of food materials, water and minerals in and around a leaf. Therefore, it can be clearly said that the venation in leaves makes it fit for photosynthesis to take place).
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Study the given diagram:
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When a person puts food in his mouth, then teeth cut it into small pieces, chew and grind it. The glands A in the mouth secrete a substance B which is mixed with the food by tongue. The substance B contains an enzyme C which starts the digestion of food in the mouth. The slightly digested food from the mouth goes down a tube D. The special type of movements E in the walls of tube D push the food into stomach for further digestion. The stomach wall secretes gastric juice containing three substance F, G and H. One of the functions of F is to kill bacteria which may enter the stomach with food. The substance G protects the inside layer of stomach from the damaging effect of substance F whereas substance H is an enzyme for digestion. The partially digested food then enters into small intestine for further digestion.
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(ii) substance B, and (iii) enzyme C?
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(c) What is the movement E known as?
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