Environment and Ecology MCQs – Page 2

Solved Everyday Science MCQs on the environment: ozone layer, climate agreements, pollution, acid rain, ecosystems, biodiversity and conservation.

1. 21

   The term "ecosystem" was first used by:

   AErnst HaeckelBArthur TansleyCCharles DarwinDRachel Carson

   Correct answer: B. Arthur Tansley

   British ecologist Arthur Tansley introduced the term in 1935. Ernst Haeckel coined the word "ecology".

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2. 22

   Which gas is released in large amounts by livestock and flooded rice fields and is a powerful greenhouse gas?

   AOxygenBHydrogenCNitrogenDMethane

   Correct answer: D. Methane

   Methane traps far more heat per molecule than carbon dioxide over the short term.

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3. 23

   A major effect of global warming on the oceans is:

   ARising sea levelsBFalling sea levelsCFreezing of oceansDIncrease in ocean salinity everywhere

   Correct answer: A. Rising sea levels

   Melting glaciers and ice sheets, and the expansion of warming water, raise sea levels and threaten coastal areas.

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4. 24

   Discarded electronic devices such as old phones and computers are known as:

   AOrganic wasteBE-wasteCBio-wasteDGreen waste

   Correct answer: B. E-waste

   E-waste contains valuable metals and also toxic substances like lead and mercury, so it needs careful recycling.

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5. 25

   The variety of all living organisms in an area is called:

   AHabitatBBiomassCBiodiversityDPopulation

   Correct answer: C. Biodiversity

   Biodiversity covers the variety of species, genes and ecosystems. High biodiversity makes ecosystems more resilient.

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