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प्रश्न
Explain the mechanism of photosynthesis.
उत्तर
In green plants, stomatal pores of the leaves absorb carbon dioxide from the air. Chlorophyll present in the plant cells absorbs sunlight and root hair absorbs water from the soil. All these reach chlorophyll, which utilises the Sun’s energy to combine water and carbon dioxide to form glucose and oxygen. In this way, green plants convert solar energy into chemical energy by forming carbohydrates.
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संबंधित प्रश्न
Where do plants get each of the raw materials required for photosynthesis?
Which part of the plant takes in carbon dioxide from the air for photosynthesis?
(a) Name the pigment in leaves which absorbs sunlight energy.
(b) What is the colour of this pigment?
Name the food which gets stored in plant leaves.
What are autotrophs? Give one example of autotrophs.
What will happen to the rate of photosynthesis on a plant under the following circumstances?
(i) cloudy day in morning but bright sunshine in the afternoon
(ii) no rainfall in the area for a considerable time.
(iii) gathering of dust on the leaves
Name the raw materials required for photosynthesis. How do plants obtain these raw materials?
An organism A which cannot move from one place to another, makes a simple food B from the substances C and D available in the environment. This food is made in the presence of a green coloured substance E present in organs F in the presence of light energy in a process called G. Some of the simple food B also gets converted into a complex food H for storage purposes. The food H gives a blue-black colour with dilute iodine solution.
(a) What is (i) organism A (ii) food B, and (iii) food H?
(b) What are C and D?
(c) Name (i) green coloured substance E, and (ii) organ F.
(d) What is the process G?
Water absorption through roots can be increased by keeping the potted plants:
(a) in the shade
(b) in dim light
(c) under the fan
(d) covered with a polythene bag
Which of the following is most appropriate for aerobic respiration?
