Question

Question 7 1 pts A group of scientists planted the grass, Sorghastrum nutans, in research plots to study the process of self-thinning over three months. Which of the following statements describes an experimental result consistent with self-thinning? Sorghastrum nutans individuals should start at high density and low biomass, and three months later should end at high biomass and low density. Sorghastrum nutans individuals should start at high density and three months later should end at low density. Biomass should remain constant during the experiment. The fitness of Sorghastrum nutans individuals should decrease over the three-month experiment. O Sorghastrum nutans individuals should start at high density and high biomass, and three months later should end at high biomass and low density.

Answer 1

ANSWER IS OPTION A

Sorghastrum nutans individual should start at high density and low biomass, and three month later should end at high biomass and low density.

According to self-thinning Rule it is a natural process in which the number of trees per unit area(density) decreases as the average tree size (Biomass) increases over time.

in other words it is also called the density dependent mortality in plant population.

the relation between mean surviving plant biomass (w) and plant density(p) is

                                   w = kp^x where k is the self thinning coefficient and x is the exponent