dN K -N A) The number of individuals added per unit time is greatest when N is c

Question

dN K -N A) The number of individuals added per unit time is greatest when N is close to zero. B) the per capita growth rate (t) increases as N approaches K. C) population growth is zero when N equals K. D) the population grows exponentially when K is small. E the birth rate (b) approaches zero as N approaches K. 21. According to the logistic growth equation dt Time 22. Acacia ants are often found in conjunction with acacia plants in tropical forests. They benefit from the acacia by living in their large thorns (see image on left above). However, it is unclear what impact the ants have on the acacia trees. In order to determine the type of interaction, you performed an experiment where you removed ants from some acacias and compared these plants to acacia that had ants present. You looked at both plant height (top) and plant survival (bottom). Based on the data you collected on both survival and growth of the plants, what type of interaction best describes the relationship between the ants and acacia plants? A) Facultative Mutualism B) Interspecific competition C) Obligate Mutualism D) Commensalism E) Herbivory

Explanation / Answer

21. C) population growth is zero when N equals K.

Putting N = K, dN/dt = 0.

22. C) Obligate mutualism.

Both ants and plant are in close proximity, interdependent, and their survival is drastically affect when the interaction was lost.

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