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Ecosystem · Question 64

AIPMT 2011 (Prelims)MCQEasy📈 Topic in 12% papers+4−1
1

Which one of the following statements is correct for secondary succession?

  1. It follows primary succession
  2. It occurs on deforested site
  3. It is similar to primary succession except that it has a relatively fast pace.
  4. It begins on a bare rock.

Answer

(2) It occurs on deforested site

Solution

As per NCERT, secondary succession begins in areas where natural biotic communities have been destroyed, such as abandoned farm lands, burned or cut forests and lands that have been flooded.

⇒ A deforested site already has soil, so secondary succession occurs there — (2) is correct.

⇒ It does not need to follow primary succession; it begins on a bare rock only in primary succession.

⇒ It is faster, but it also differs in starting conditions (soil present) and in its first community, so (3) is not correct.

Answer: (2)

AIPMT 2011 (Prelims)

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2

Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?

  1. It shows energy content of different trophic level organisms
  2. It is upright in shape
  3. It is inverted in shape
  4. Its base is broad
AIPMT 2011 (Prelims)
3

Which of the following representations shows the pyramid of numbers in a forest ecosystem? [figure]

  1. B
  2. A
  3. D
  4. C
AIPMT 2010 (Mains)
4

Which one of the following is one of the characteristics of a biological community?

  1. Mortality
  2. Sex-ratio
  3. Stratification
  4. Natality
AIPMT 2010 (Prelims)
5

The biomass available for consumption by the herbivores and the decomposers is called –

  1. Standing crop
  2. Net primary productivity
  3. Gross primary productivity
  4. Secondary productivity
AIPMT 2010 (Prelims)
6

The correct sequence of plants in hydrosere is :

  1. Volvox Hydrilla Pistia Scirpus Lantana Oak
  2. Pistia Volvox Scirpus Hydrilla Oak Lantana
  3. Oak Lantana Volvox Hydrilla Pistia Scirpus
  4. Oak Lantana Scirpus Pistia Hydrilla Volvox
AIPMT 2009
7

Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?

  1. Phytoplankton
  2. Zooplankton
  3. Frog
  4. Fish
AIPMT 2009
8

Consider the following statements concerning food chains: (i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation (ii) Removal of most of the carnivores resulted in an increased population of deer (iii) The length of food chains is generally limited to 3-4 trophic levels due to energy loss (iv) The length of food chains may vary from 2 to 8 trophic levels Which two of the above statements are correct?

  1. (iii), (iv)
  2. (ii), (iii)
  3. (i), (iv)
  4. (i), (ii)
AIPMT 2008
9

The slow rate of decomposition of fallen logs in nature is due to their:

  1. low moisture content
  2. poor nitrogen content
  3. anaerobic environment around them
  4. low cellulose content
AIPMT 2008
10

About 70% of total global carbon is found in:

  1. Grasslands
  2. Agroecosystems
  3. Oceans
  4. Forests
AIPMT 2008
11

Which one of the following ecosystem types has the highest annual net primary productivity ?

  1. Temperate evergreen forest
  2. Temperate deciduous forest
  3. Tropical rain forest
  4. Tropical deciduous forest
AIPMT 2007

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