CIE Biology Paper-4: Specimen Questions 115 - 116 of 120

Question number: 115

Essay Question▾

Describe in Detail

What are the threats or causes of loss of biodiversity?

Explanation

The major threats of biodiversity is related to –

  • Habitat loss-It occur due to many processes including development, clearing land for agriculture, water diversion and logging.
  • Fragmentation- As more habitat is lost, the remaining fragments shrink and become more isolated from each other. This can keep animals from moving among fragments, which can increase inbreeding which results in decreased genetic diversity.
  • Habitat degradation-It involves disturbing key habitat features, such as extensive erosion or adding toxins to the soil or water
  • Over harvesting- Over harvesting is related to hunting, fishing or collecting so many individuals from a species that it can no longer reproduce enough to withstand the harvest.
  • Pollution-different kind of pollutions are the main cause of habitat loss of species
  • Research purpose-Many endangered species are used for the purpose of research that is the main cause of loss of biodiversity.
  • High rate of population-High rate of human population disturb the habitat of many other species and can cause threats of biodiversity.

Question number: 116

Essay Question▾

Describe in Detail

What do you mean by population? Write difference between population and community

Explanation

Population is the number of interbreeding individuals of a species found in a geographical area.

Table shows difference between population and community

Table shows difference between population and community related to morphological structure, interbreeding process etc.

population

community

It is the number of interbreeding individuals of a species found in a geographical area.

It is the grouping of individuals of

All the organisms in a population are morphologically similar

Different members of a community are morphologically dissimilar

They can interbreed freely

Interbreeding is absent

There is no relationship of eating and being eaten

In a biotic community there is relationship present in eaten and being eaten

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