Study the four statements (a-d) given below and select the two correct ones out of them:

(i) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers

(ii) Predator star fish Pisaster helps in maintaining species diversity of some invertebrates

(iii) Predators ultimately lead to the extinction of prey species

(iv) Production of chemicals such as nicotine, strychnine by the plants are metabolic disorders

The two correct statements are:

  • Option 1)

    (ii) and (iii)

  • Option 2)

    (iii) and (iv)

  • Option 3)

    (i) and (iv)

  • Option 4)

    (ii) and (ii)

 

Answers (1)

As discussed in

Consumers -

All animals depend on plants (directly or indirectly) for their food needs. They are hence called consumers and also heterotrophs

- wherein

If they feed on the producers, the plants, they are called primary consumers, and if the animals eat other animals which in turn eat the plants (or their produce) they are called secondary consumers

 

As discussed in

Species Diversity -

The diversity at the species level. For example, the Western Ghats have a greater amphibian species diversity than the Eastern Ghats.

- wherein

The richness of species explains the extent of biodiversity and provides several methods for comparing different sites. The richness of species depends on the conditions of climate.

 

 As discussed in

Predation -

Predation as nature's way of transferring to higher trophic levels the energy fixed by plants.

- wherein

Besides acting as 'conduits' for energy transfer across trophic levels, predators play another important role. The keep prey population under control. But for predators, prey species could achieve very high population densities and cause ecosystem instability.

 

nicotine, strychnine are naturally produced in the plants and are not metabolic disorders.


Option 1)

(ii) and (iii)

This solution is incorrect

Option 2)

(iii) and (iv)

This solution is incorrect

Option 3)

(i) and (iv)

This solution is incorrect

Option 4)

(ii) and (ii)

This solution is correct

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