biodiversty part 3 short questions answer all
Answers
Answer:
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Explanation:
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Answer:
State how the current occurrence of species extinction is different from the earlier mass extinction.
A.1. Species extinction in earlier times occurred due to natural calamities such as volcanic eruptions, landslides, flood etc while in the present times, the cause of species extinction is human activities.
Q.2. Which of the following according to you is the major cause for loss of biodiversity amongst the four main causes of loss of biodiversity ( Habitat loss and fragmentation, alien species invasion, over-exploitation and co-extinctions)? Justify your pick.
A.2. Habitat loss and fragmentation. As it is caused by clearing and over-exploitation of forest land for urbanization and industrialization purposes. Overpopulation has destroyed forests and burdened forest resources. Larger habitats are split into smaller fragments causing birds and mammals to migrate in quest of larger territories thereby resulting in the population declination.
Q.3. How can the loss of one species lead to the extinction of another?
A.3. It can be explained via co-extinction, where extinction of two mutually interrelated species takes place. For instance, the extinction of host fish causes the extinction of all parasites located on it.
Q.4. Can diversity and productivity of a natural community be constant for over a hundred years?
A.4. No, it is not possible as natural habitat is never maintained in real, resources cannot be available in abundance always and environmental conditions for survival keeps fluctuating.
Q.5. Why is there greater biodiversity in subtropical/tropical regions than in temperate regions?
A.5. It is because these regions are not disturbed due to lesser variations in climatic conditions. This is why species had a longer evolutionary time for diversity. The environment in temperate regions is more seasonal and unpredictable, hence lesser species diversity.
Q.6. For assessment of biodiversity in bacteria, why are conventional methods unsuitable?
A.6. It is because bacteria cannot be cultured in normal conditions which makes it difficult to study their biochemical and morphological characteristics. Hence these are clubbed with a few more characteristics to assess the biodiversity of bacteria.
Q.7. What are the factors that determine a species as threatened?
A.7. The following criteria need to be used in categorizing a species as threatened:
Declination in the number of species at a distressing rate
Destruction and modification of their habitat