Which of the following is true for bacteria?

They are found only in food.

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All bacteria are harmful.

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They can be seen with naked eye.

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They are of different shapes.

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Solution

The correct option is D They are of different shapes.
Bacteria can be found everywhere- food, water, air and even in humans. Not all bacteria are harmful. Some like Lactobacillus are useful for humans. Bacteria are very small and they have to be observed using a microscope. They are of different shapes and sizes.

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Can we explain this by this logic....

We see things only when they are hit by the light rays which then reach our eyes.....but bacteria are too small compared to light rays that light rays cannot hit them and hence they couldn't be seen.....

But wait, I have another question, if the above logic is correct then bacteria would even not be able to see each other...because bacteria are not getting hit by any light ray so they couldn't be seen even by others...

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