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Answer: Option (C) 130nm – 170mm is correct because the egg of an ostrich is the largest known cell in the animal kingdom, and it can grow up to 170 mm in size. Though it looks like a solid object, it is actually a single cell, especially the yolk part. Ostrich eggs are easily visible without a microscope, unlike most cells which are very small. The size of this cell can reach up to 17 cm (170 mm) and it can weigh more than 1.4 kg. This makes it the largest biological cell recorded in nature. Despite being the largest cell, it still carries out all the basic functions of a cell like storing nutrients and supporting the embryo’s growth.
Complete Answer:
“Option (a) 130nm – 190 mm.” This is incorrect because 190 mm (19 cm) is more than the average and maximum size seen in ostrich eggs. There is no reliable evidence that supports this range as the maximum size of the largest cell. Therefore, this range is exaggerated.
“Option (b) 130nm – 150 mm”. This is also incorrect because although some ostrich eggs may measure around 150 mm, the question asks for the largest size. Since ostrich eggs can grow up to 170 mm, this option gives a lower limit than the actual maximum.
“Option (c) 130nm – 170 mm.” This is the correct option. It matches the maximum size of the ostrich egg, which is the largest known cell in the world. It is a scientifically accepted and accurate range.
“Option (d) 130nm – 180 mm.” This option is slightly incorrect because 180 mm is above the standard size range found in most ostrich eggs. Most reliable sources confirm the upper size limit to be 170 mm, so this value is a bit higher than accepted.
Hence, the correct option for ‘The largest cell measuring…………is the egg of an ostrich’ is option C.
Common Biology Doubts:
