Science 1 1) Which one of the following is the correct definition of photosynthesis? Conversion of chemical energy into mechanical energy Conversion of light energy from sun into chemical energy Conversion of chemical energy into electrical energy Conversion of electrical energy into chemical energy ________________________________________ 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 C B A D ________________________________________ 3) Which gas is produced during photosynthesis? CO₂ O₂ H₂ N₂ ________________________________________ 4) What is the importance of photosynthesis? This process synthesises food only for animals. This process synthesises food only for all non-green plants. This process synthesises food only for its own use. This process traps energy from sunlight and synthesises food for all other living organisms. ________________________________________ 5) Name the plastid which can absorb solar energy. Amyloplast Mitochondria Chloroplast Leucoplast ________________________________________ 6) Which one of the following affects the rate of photosynthesis? (i) Concentration of CO₂ (ii) Chlorophyll (iii) Light intensity (iv) Water i & ii only iii only i & iv only i, ii, iii & iv ________________________________________ 7) Why does a leaf to be tested for the presence of starch have to be boiled in alcohol? To soften its tissue. To make the leaf starch free. To dissolve chlorophyll. To dissolve iodine. ________________________________________ 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? b, a, d, c a, d, b, c b, d, a, c d, a, b, c ________________________________________ 9) Why should a potted plant be kept in the dark for at least 24-48 hours before performing the experiment? To increase the starch in the leaves To de-starch the leaves To activate the chloroplast in the leaves To deactivate the chloroplast in the leaves ________________________________________ 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? The one covered with green paper strip. The one covered with white paper strip. The one covered with black paper strip. The one covered with transparent paper strip.