Question

The S-shaped growth curve and grand period of growth may change with
a. Sudden fluctuation in light intensity
b. Change in temperature
c. Fluctuation in humidity
d. It remains unaffected

Answer 1

Hint: The grand period of growth is called the exponential phase. Under favorable conditions, there is a characteristic increase in the growing parts.

Complete answer:
- Growth is slow at first (lag phase) then gains speed (log/exponential phase) and eventually slows down to come to halt (steady-state).

- The initial is the lag period during which cells activate their biochemical machinery for rapid growth by synthesizing the necessary enzymes required for growth. This is followed by a period during which there is an exponential increase in cell number which is called a long period.

- The logging period is the phase where rapid growth does not continue indefinitely and due to depleted nutrient supply, accumulation of toxic products and other limiting factors ultimately leads to reducing the cell number until the cell population reaches a steady state in which the number of cells remains constant (stationary) or even declines.

- The sigmoidal curve represents the integrated sum of the curves for each growing organ and cell and presents the changing size of these parts.

- The S-shaped growth curve is a pattern of growth in which a new environment the population density of an organism increases slowly initially, in a positive acceleration phase, then increases rapidly approaching an exponential growth rate.

- The grand period is the time during which a cell, organ, or organism is developing that period of development is characterized by a rapid increase in size in minimum duration and remains unaffected by any change in factors.

- The physiological activities are at their maximum.

- Environmental conditions may alter growth rates but not the sigmoid form of the growth curve or the grand period of growth.

Hence, The correct answer is option (D). the grand period of growth remains unaffected.

Note: The total time during which this course of growth takes place is called a grand period of growth. If the growth rate is plotted against time a slanting S-shaped curve is obtained which is called the sigmoidal curve or S-shaped curve.