Importance of Light in Photosynthesis
1)Which one of the following is the correct definition of photosynthesis?

2)Among the following which one is the correct balanced chemical equation for photosynthesis? (A) 6CO₂ + 12H₂O + (light energy) → C₆H₁₂O₆ + 6O₂ + 6H₂O (B) CO₂ + 12H₂O + (light energy) → C₆H₁₂O₆ + O₂ + 6H₂O (C) 6CO₂ + H₂O + (light energy) → C₆H₁₂O₆ + 12O₂ + 126H₂O (D) 12CO₂ + H₂O + (light energy) → C₆H₁₂O₆ +12O₂

3)Which gas is produced during photosynthesis?

4)What is the importance of photosynthesis?

5)Name the plastid which can absorb solar energy.

6)Which one of the following affects the rate of photosynthesis? (i) Concentration of CO₂ (ii) Chlorophyll (iii) Light intensity (iv) Water

7)Why does a leaf to be tested for the presence of starch have to be boiled in alcohol?

8)Given below are the steps to be followed for performing "Starch test" on a green leaf. (a) Boil the leaf in alcohol. (b) Boil the leaf in water. (c) Dip the leaf in iodine solution. (d) Wash the leaf in water. What is the proper order of the seps?

9)Why should a potted plant be kept in the dark for at least 24-48 hours before performing the experiment?

10)A portion of each of four de-starched leaves of a plant was covered with paper strips of various kinds. The plant was exposed to sunlight for 5 hours. Thereafter, the strips were removed and the leaves were tested for starch in the covered portion. Which one out of the four leaves gave the starch test in the covered portion?


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