51. Gaseous exchange takes place in leaves through tiny pores for the purpose of photosynthesis. What are these pores?
52. The photosynthesis occurs in the
53. The oxygen released during photosynthesis process comes from
54. In plants, photosynthesis mainly occurs in the
55. Which one is important in photosynthesis to allows plants to absorb energy from light?
56. Photosynthesis occurs in
57. Sulphur Dioxide pollution is indicated by an excessive growth of which of the following?
58. Food wrapped in news paper is likely to get contaminated by
59. What is full form of BOD?
60. The non-biotic pollutant of underground water is
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