Question
Explain sigmoid growth curve with the help of diagram.
✓
Answer
- When growth occurs in plants three distinct phases of growth are noticed.
- Phase of cell formation is first phase where meristematic cells divide and new cells added.
- In phase of cell enlargement newly formed cells elongate and with turgidity there is cell enlargement.
- In phase of cell maturation cells get differentiated.
- When we compare the growth rate it differs in these three phases.
- In first phase or lag phase it is slow, while in log phase or exponential phase, growth rate accelerates and it reaches maximum.
- In stationary phase of maturation growth rate slows down and comes to steady state.
- When this changing rate of growth is plotted against time duration in a graph a sigmoid or S-shaped growth curve is obtained.
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