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

Answer: (d)

Biosphere refers to that portion of the Earth which is occupied by the various forms of life, in addition to the three main physical zones, the Lithosphere, the Hydrosphere and the Atmosphere.

Answer: (c)

Tropical rainforests exhibit high levels of biodiversity. Around 40% to 75% of all biotic species are indigenous to the rainforests.

Rainforests are home to half of all the living animal and plant species on the planet. Two-thirds of all flowering plants can be found in rainforests.

Answer: (d)

El Niño is an irregularly periodical variation in winds and sea surface temperatures over the tropical eastern Pacific Ocean.

Scientists have found an association between El Nino and global warming since El Nino events cause short-term spikes in global average surface temperature.

For example, an increase in the frequency and magnitude of El Niño events have triggered warmer than usual temperatures over the Indian Ocean.5