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Solution


Q.

Typical growth curve in plants is                        [2015]
1 stair-steps shaped  
2 parabolic  
3 sigmoid  
4 linear  

Ans.

(3)

Geometric growth cannot be sustained for long in natural conditions. Limited nutrient availability slows down the growth. It leads to a stationary phase or even a decline. Plotting the growth against time gives a typical sigmoid or S-curve. Sigmoid curve of growth is typical of most organisms in their natural environment including plants. An idealised sigmoid growth curve is shown below: