ecology & bio environment geography section 2 MCQ Questions & Answers Detailed Explanation

Answer: (d)

Soil, water and climate of a region are the three primary factors significantly influencing the vegetation of a region. Such factors as depth, texture, and humus content of the soil determine the type of vegetation that can be supported in a region.

Again, any vegetation needs moisture to survive and this explains the range which varies from evergreen forests to shrubs.

Temperature also plays a crucial role in plant growth and development with extremes on either end affecting plant growth severely.

Answer: (a)

In paleo-geography, Gondwana, originally Gondwanaland, was the southernmost of two supercontinents that were part of the Pangaea supercontinent. It existed from approximately 510 to 180 million years ago.

It included most of the landmasses in today's Southern Hemisphere, including Antarctica, South America, Africa, Madagascar and the Australian continent, as well as the Arabian Peninsula and the Indian subcontinent, which have now moved entirely into the Northern Hemisphere.

Answer: (d)

Mercury causes biomagnification problem in the ecosystem.

Answer: (c)

A windbreak or shelterbelt is a plantation usually made up of one or more rows of trees or shrubs planted in such a manner as to provide shelter from the wind and protect soil from erosion.

They are commonly planted around the edges of fields on farms. If designed properly, windbreaks around a home can reduce the cost of heating and cooling and save energy. Windbreaks are also planted to help keep snow from drifting onto roadways and even yards.

Other benefits include providing habitat for wildlife and in some regions, the trees are harvested for wood products.

Answer: (b)

Energy enters an ecosystem by being used to convert low-energy carbon dioxide into high-energy carbohydrate, then passes through one or more of the organisms of the community, and is then lost to the ecosystem.

Eventually, all of the energy that enters the ecosystem is lost in the form of heat.

Answer: (a)

An evergreen forest is a forest consisting entirely or mainly of evergreen trees that retain green foliage all year round.

Such forests reign in the equatorial region, between the tropics primarily as broadleaf evergreens, and in temperate and boreal latitudes primarily as coniferous evergreens.