Growth is Measurable – Class 11 | Chapter – 15 | Biology Short Notes Series PDF

Growth is Measurable: Growth is irreversible increase in size.It is increase in the amount of cytoplasm in the organism.It can be measured by counting the number of cells or by measuring the amount of cytoplasm.Even increase inthe size by height or width is also can be measured.

Growth is Measurable

Growth is measured by a variety of parameters which are :
✓ increase in fresh weight
✓ dry weight
✓ Length
✓ Area
✓ volume and cell number

  • The growth (at a cellular level) is basically a consequence of increase in the amount of protoplasm.
  • We cannot measure growth directly, it is measured by some quantity that is more or less proportional to it. So the growth is measured by a variety of parameters like increase in fresh weight; dry weight; length; area; volume and cell number etc. 
  • One single maize root apical meristem may give rise to more than 17,500 new cells per hour. 
  • The cell in a watermelon can increase in size by upto 3,50,000 times. 
  • Therefore, growth may be expressed as increase in cell number or as increase in size of cell. 
  • The growth of a pollen tube is measured in terms of length. 
  • An increase in surface area denotes growth in a dorsiventral leaf or dicot leaf.

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By Team Learning Mantras