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Ans. (a) Water, carbon dioxide and solar energy
Explanation:
Raw materials for photosynthesis are carbon dioxide, water, and solar energy . Carbon dioxide is produced through the exchange of gases. This function is performed by stomata. Water is absorbed by roots from the soil, whether from irrigation or rain. Chlorophyll absorbs solar energy.
Ans. (a) Photosynthesis occurs during the day time only
Explanation:
Photosynthesis requires sunlight and it requires opening and closing of stomata. That’s why stomata open or close at day time.
Explanation:
The rate of photosynthesis decreases and finally stops when the green plant gets green light because green light is not absorbed but reflected back by the plants.
Explanation:
Take a destarched plant. Insert one of its leaves in a conical flask which contains potassium hydroxide. Leave it in the sunlight. After a few hours, test this leaf and any other leaf of this plant for starch. The leaf which was exposed to the atmospheric air turns blue black and the one in the flask containing KOH does not turn blue black after iodine test. This experiment shows that CO_2 is necessary for photosynthesis as KOH absorbs CO_2.
Explanation:
Photosynthesis is necessary in nature because of the following reasons :
(i) The body of all living organisms, both plants and animals, is dependent on the food that has been synthesised in a green cell by photosynthesis.
(ii) The purification of the atmosphere whereby the volume of CO_2 remains fairly constant due to the photosynthetic activity of green plants.
(iii) Oxygen is given out during photosynthesis which is necessary to sustain life on earth.
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Download NowChapter No. | Chapter Name |
---|---|
Chapter 1 | Structure of Chromosome, Cell Cycle and Cell division |
Chapter 2 | Genetics: Mendel's law of Inheritance |
Chapter 3 | Absorption by Roots- The Processes Involved |
Chapter 4 | Transpiration |
Chapter 5 | Photosynthesis |
Chapter 6 | Chemical Coordination in Plants |
Chapter 7 | The Circulatory System |
Chapter 8 | The Excretory System |
Chapter 9 | The Nervous System and Sense Organs |
Chapter 10 | The Endocrine System |
Chapter 11 | The Reproductive System |
Chapter 12 | Human Population |
Chapter 13 | Human Evolution |
Chapter 14 | Pollution |
CBSE Important Questions Class 10
ICSE Important Questions Class 10
CBSE Important Questions Class 10
ICSE Important Questions Class 10