Monday, August 20, 2012

STPM Biology - chapter 15: Revision essay question 1

1. Describe the pattern of each of the growth curve .

Answer


Lag phase, growth is slow in this phase. There is only a no cell division nor ell enlargement.
Log phase, growth is the fastest in this phase. The cells divide and enlarge rapidly as conditions for growth are at optimum condition.
Decelerating phase ,Growth begins to decrease due to the limiting by external or internal factors or both. For examples are depleting nutrients,limited space,competition, accumulation of excretory wastes and toxins.
Stationary phase, Growth are no longer occur.
Negative phase, the organism is ageing and the growth rate start to decrease.

Assignment submitted by L.Y., Kong,  S. H., Lim, S. C., Soo, C. W. Tan and C.C.,Teh 2011/2012 (IBM)

No comments:

Post a Comment