ecology & bio environment geography section 1 MCQ Questions & Answers Detailed Explanation

Answer: (d)

Most of the terrestrial diversity is found in tropical rainforests. As per an estimation, these forests account for around 40% to 75% of all biotic species and are home to half of all the living animal and plant species on the planet.

A single hectare of rainforest may contain 42,000 different species of insect, up to 807 trees of 313 species and 1,500 species of higher plants.

Answer: (a)

The rubber plant grows wild in the equatorial regions of the world which are marked by rainfall of around 250 cm evenly distributed without any marked dry season and with at least 100 rainy days per year; temperature range of about 20°C to 34°C with a monthly mean of 25°C to 28°C; and high atmospheric humidity of around 80%.

The three largest producing countries, Thailand, Indonesia and Malaysia, together account for around 72% of all-natural rubber production.

Answer: (a)

Projections of future climate change suggest further global warming, sea-level rise, and an increase in the frequency and severity of some extreme weather events. Over the next several millennia, even if emissions were drastically reduced, global temperatures would remain close to their highest level for at least 1,000 years.

The coast will suffer severe impacts from sea-level rise.

Answer: (b)

Part of the Earth’s surface and atmosphere that contains the entire terrestrial ecosystem, and extends from ocean depths to about six kilometers above sea level. Not precisely demarkable, it contains all living organisms and what supports them soil, subsurface water, bodies of water, air and includes hydrosphere and lithosphere.

Answer: (c)

A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.

Answer: (c)

There will be a decrease in the number of rats simply because rat is a prey to all the three of them and this leads to just a single conclusion that there is decrease in the number of rats.