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NEST2017BiologyOrganisms and Populations

Ecologist David Tilman grew laboratory populations of two species of diatoms namely Asterionella formosa (Af) and Symedra ulna (Su) in liquid media supplemented with silica. The researcher monitored not only the population growth but also the level of silica in the medium. The results of the experiments are shown in the graphs ( P , Q and R ) below. P and Q respectively are graphs obtained when A f and S u are grown

Options

  1. AWhen grown together, presence of Af in the medium has a positive effect on the growth of Su .
  2. BWhen grown together, Su reduces silica concentration to a level that does not allow Af to multiply.
  3. CAf reduces resource availability at a faster rate than Su.
  4. DThere is competition for the resource between Af and Su.

Correct answer

D. There is competition for the resource between Af and Su.

Step-by-step solution

No solution available.

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