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Ecosystems & Ecology Concepts

49 questions in Environment & Ecology.

Asked in 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2003, 2002, 2001, 2000, 1999

2013 · Q31Environment & EcologyEcosystems & Ecology Conceptsmoderate

With reference to food chains in ecosystems, consider the following statements: 1. A food chain illustrates the order in which a chain of organisms feed upon each other. 2. Food chains are found within the populations of a species. 3. A food chain illustrates the numbers of each organism which are eaten by others. Which of the statements given above is/are correct?

  1. (a)1 only
  2. (b)1 and 2 only
  3. (c)1, 2 and 3
  4. (d)None
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Official answer(a) 1 only

2010 · Q4Environment & EcologyEcosystems & Ecology Conceptsmoderate

A new type of El Nino called El Nino Modoki appeared in the news. In this context, consider the following statements: 1. Normal El Nino forms in the Central Pacific ocean whereas El Nino Modoki forms in Eastern Pacific ocean. 2. Normal El Nino results in diminished hurricanes in the Atlantic ocean but El Nino Modoki results in a greater number of hurricanes with greater frequency. Which of the statements given above is/are correct?

  1. (a)1 only
  2. (b)2 only
  3. (c)Both 1 and 2
  4. (d)Neither 1 nor 2
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Official answer(b) 2 only

2010 · Q65Environment & EcologyEcosystems & Ecology Conceptseasy

Some species of plants are insectivorous. Why ?

  1. (a)Their growth in shady and dark places does not allow them to undertake sufficient photosynthesis and thus they depend on insects for nutrition.
  2. (b)They are adapted to grow in nitrogen deficient soils and thus depend on insects for sufficient nitrogenous nutrition.
  3. (c)They cannot synthesize certain vitamins themselves and depend on the insects digested by them.
  4. (d)They have remained in that particular stage of evolution as living fossils, a link between autotrophs and heterotrophs.
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Official answer(b) They are adapted to grow in nitrogen deficient soils and thus depend on insects for sufficient nitrogenous nutrition.

2010 · Q103Environment & EcologyEcosystems & Ecology Conceptseasy

King Cobra is the only snake that makes its own nest. Why does it make its nest?

  1. (a)It is a snake-eater and the nest helps attract other snakes
  2. (b)It is a viviparous snake and needs a nest to give birth to its offspring
  3. (c)It is an oviparous snake and lays its eggs in the nest and guards the nest until they are hatched
  4. (d)It is a large, cold blooded animal, and needs a nest to hibernate in the cold season
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Official answer(c) It is an oviparous snake and lays its eggs in the nest and guards the nest until they are hatched

2003 · Q110Environment & EcologyEcosystems & Ecology Conceptsdifficult

Assertion (A): Unlike temperate forests, the tropical rain forests, if cleared, can yield productive farm-land that can support intensive agriculture for several years even without chemical fertilizers. Reason (R): The primary productivity of the tropical rain forest is very high when compared to that of the temperate forests.

  1. (a)Both A and R are individually true and R is the correct explanation of A
  2. (b)Both A and R are individually true but R is NOT the correct explanation of A
  3. (c)A is true but R is false
  4. (d)A is false but R is true
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Official answer(d) A is false but R is true