Answer to Question #176275 in Biology for Sara

Question #176275

a)     Assume the population of Bacteria B completely dies off. Bacteria A are now transferred to an open environment where they have lots of room for growth and a continual supply of food. Over the course of three days, the population of bacteria steadily increases as follows:


Day 1: 1500 bacteria

Day 2: 3000 bacteria

Day 3: 7000 bacteria

Day 4: 13,000 bacteria


Is this population of bacteria r-selected or k-selected? Explain how you arrived at your answer. Hint: Review your definitions of “r” and “k.” (2 marks)



This bacteria is k selected, because k-selected species mature slowly, they have a longer life span and they provide more parental care so that when their offspring matures it can survive in any environment.  Correct?

Expert's answer

R-selected species grow rapidly, and tend to be found in less competitive, low-quality environments. K-selected species produce offspring that have a higher probability of survival to maturity.

Since the number of bacteria increases only two-fold each day, the growth is slow and represents a pattern of k-selected species.

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