Two herbivorous mammal species were introduced into an ecosystem at the same time and in equal numbers. The graph below represents their populations during the...

      

Two herbivorous mammal species were introduced into an ecosystem at the same time and in equal numbers. The graph below represents their populations during the first seven years. Study the graph and answer the questions that follow.

years.png

(a) (i) Which species has a better competitive ability?

(ii) Give a reason for your answer.

(b) Account for the shape of the curve for spicies A between;
(i) One year and three years

(ii) 4 years and eight years.

(c) A natural predator of species A was introduced into the ecosystem. With a reason, state how the
population of each species would be affected?

(d) State four other biotic factors of the ecosystem which affects organisms distribution in their habitat other than the one illustrated in the above graph.

(e) Name the instruments used to measure the following;

(i) Light intensity.
(ii) Light penetration in water.
(iii) Speed of wind.
(iv) Atmospheric pressure

  

Answers


Martin
(a) (i) Species A

(ii) The rate of growth (multiplication) of species A is higher than that of B

(b) (i) Population increased exponentially (rapidly); due to high number of reproducing individuals; and
suitable environmental conditions(such as food , space, resources not limiting e.tc.)

(iii) Population becomes constant; because of shortage of resources like food and space; and birth rate
equals death rate

(c) Species A would decrease; due to predation; while the population of species B would increase; due to
less competition for food with species A/ more resources or food available

(d)
(i) Predation

(ii) Parasitism

(iii) Symbiosis

(iv) Saprophytism

(e) (i) Photographic light meter

(ii) Sacchi disc

(iii) Anemometer

(iv) Barometer
marto answered the question on September 30, 2019 at 10:54


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