Growth in Humans and Animals (2)

Biology

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The importance of growth in organisms

For the development and maturation of bodily systems

The parameters that are used in measuring growth

- Increase in size or volume - Changes in fresh weight or dry weigh

Example of increase in size or volume

Changes in height or length of an organism

Dry weight

Refers to the weight of an organism after all the fluid is removed from its body

Way to measure dry weight

This is done by weighing the organism after it has been dried in the oven at 100 °C repeatedly until the weight remains the same

The weakness of parameter (changes in fresh weight or dry weight)

The weakness of this parameter is that the organism has to be killed, however, this method is suitable for plants

Fresh weight

Can be taken whenever and organisms do not need to be killed

The weakness of parameter (fresh weight)

This method is less accurate because the amount of fluid in the body is dependent on the organism’s fluid intake

Ecdysis (1)

The moulting process of the exoskeleton that allows growth and development of insects

Ecdysis (2)

This process is controlled by hormones

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