Question

IV. Long Answer Questions
Using population figures given in the book, draw a graph of population vs year starting
of
from the year 1800 till date.
Enlist various factors responsible for the destruction of ecosystem.​

Answer 1

Answer:

Many environmental factors, including water diversions, affect the structure and functioning of biotic communities in the delta. Although it would be convenient if one or only a few of these factors could be identified as the source of the “problem,” or even ranked with some certainty, it is not possible to do that, for at least three reasons: the “problem” is not easily definable, the suite of stressors is complex and interactive, and the ecosystem and its components do not react to any stressor as a single unit.

“The Problem” of the Delta Is Not a Single, Easily Definable Problem

Although the ecosystem has been radically altered over the past 150 years, it nonetheless remains a biologically diverse and productive ecosystem. Some species have thrived, but others, including some listed as threatened or endangered under the federal Endangered Species Act and California’s Endangered Species Act, have declined dramatically. In addition, species composition and environmental conditions in the delta have undergone large changes over the period. Therefore, while an immediate difficulty for some is that concern over some listed species has affected water diversions, “the problem” is harder to define biologically, and is perceived differently by various stakeholder groups, institutions, and other interests.

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Answer 2

Answer:

Global wildlife is in freefall, warned WWF today, as its flagship Living Planet Report 2020 reveals population sizes of mammals, birds, fish, amphibians and reptiles have fallen an average of 68 per cent globally since 1970 – more than two thirds in less than 50 years.

Explanation:

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