In general, size of the cells has no relationship to the size of the organism . how do the nerve cell in a rat and a giraffe compared in their lengths

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Solution

The evolutionary changes occurred in Giraffe to find its proper food. That is they developed long necks and rest of its body also became massive. So as the nerve cells are also very long. This made the animal to respond very slowly to the outside environment.This is quite different in rats which possess a very small body. Their response to stimuli is so fast that they exhibit jerky movements.

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Question 40
The size of the cells of an organism has no relation with the size of its body. Do you agree? Give reason for your answer.

Which of the following statements are true?

Single-celled organisms consist of many cells.

Nerve cell is the longest cell in human body.

Muscle cells are long and contractile to pull or squeeze the body parts.

The size of the organism is often related to the shape of the individual cells.

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