CIE Biology Paper-4: Specimen Questions 115 - 116 of 120
Question number: 115
Describe in Detail
What are the threats or causes of loss of biodiversity?
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
Describe in Detail
What do you mean by population? Write difference between population and community
Population is the number of interbreeding individuals of a species found in a geographical area.
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