Bio (experiment 2 )

AIM: Light is required for photosynthesis. -------------------------------------------------------------------------------1.The process of photosynthesis occurs in a. ultraviolet radiation b. infra red radiation c. visible light

>>>>>>>>>>>>

d. dark 2.Which step of photosynthesis is responsible for evolution of molecular oxygen? a. light reaction

>>>>>>>>>>

b. dark reaction c. Calvin cycle d. Krebs cycle 3. In photosynthesis light is absorbed by a. anthocyanins present in vacuoles b. chlorophylls present in chloroplasts

>>>>>>>>>>

c. chlorophylls present in vacuoles d. anthocyanins present in chloroplasts 4 Leaf is boiled in 70% alcohol to a. observe the starch in chloroplasts b. remove chlorophyll from the leaf

>>>>>>>>>>>>>>>

c. stain the starch d. separate the cells 5. Photosynthesis occurs inside the a. mitochondria b. chloroplasts

>>>>>>>>>>>>>>

c. ribosomes d. vacuoles 6. Tick the correct statement a. photosynthesis cannot occur in presence of light

b. synthesis of starch occur in underground potato tuber

>>>>>>>>>>>>>>>>>

c. light is directly involved in reduction of carbon dioxide d. light is not directly involved in evolution of oxygen 7. In submerged water plants a. light is not needed for photosynthesis b. photosynthesis does not occur c. light is necessary for photosynthesis

>>>>>>>>>>>>>>

d. carbon dioxide is not needed for photosynthesis 8. What will happen if the green plant is kept in dark? a. photosynthesis will be slow b. photosynthesis will stop

>>>>>>>>>>>

c. photosynthesis will continue d. photosynthesis will increase 9. Before carrying out the test for starch in a leaf on exposure to sunlight, the leaf is boiled in alcohol kept in water bath to a. extract starch b. dissolve chlorophyll

>>>>>>>>>>>

c. allow water to move into the leaf d. make membrane of leaf cells more permeable 10. A black strip of paper was clipped on to a destarched leaf to cover a part of leaf. The plant was then exposed to sunlight for 4 hours, and the leaf was tested for starch. When iodine solution was added a. the entire leaf turned blue-black b. the covered part of the leaf became blue black c. the uncovered part of the leaf became blue-black

>>>>>>>>>>.

d. The colour of iodine solution remained unchanged 11. Which of the following is/are required for photosynthesis? a. light b. water c. carbon dioxide

d. all of these

>>>>>>>>>>>>>>>>>

12.Evolution of oxygen from water is a a. light reaction

>>>>>>>>>>>>>>

b. dark reaction c. both of these d. none of these 13. Leaves are destarched by keeping the plant in a. dark for 2-3 hours b. light for 2-3 hours c. dark for 2-3 days d. light for 2-3 days

>>>>>>>>>>>>>>>>

14. Which of the following part of leaf will become blue-black after the treatment of iodine solution? a . uncovered part of leaf

>>>>>>>>>>>>>>>>>>>

b. covered part of leaf c. both of these d. non of these 15.In the experiment of photosynthesis, students are asked to cover a portion of a leaf of a destarched potted plant with opaque paper. "A" covered the leaf with red strip, "B" with green. "C" with blue and "D" with black. When the starch test was done after 4 hours, the result showed no starch in a. the portion covered with red, green and blue strips b. the portion covered with green strip c. the portion covered with black and blue strips d. any of the covered portion

>>>>>>>>>>>>>>>

16. The teacher instructed a student to lace a healthy potted shoe flower plant in a dark room for 24 hours prior to an experiment on photosynthesis. the purpose of placing it in a dark room is a. to increase the intake of carbon dioxide b. to activate the chloroplasts in leaves c. to destarch the leaves

>>>>>>>>>>>>>>>>

d. to denature the enzyme in the leaves