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Ecosystem · Question 61

AIPMT 2011 (Mains)MCQEasy📈 Topic in 38% papers+4−1
1

The breakdown of detritus into smaller particles by earthworm is a process called

  1. Fragmentation
  2. Catabolism
  3. Mineralisation
  4. Humification

Answer

(1) Fragmentation

Solution

As per NCERT, the important steps of decomposition are fragmentation, leaching, catabolism, humification and mineralisation.

⇒ Detritivores (e.g. earthworm) break down detritus into smaller particles; this process is called fragmentation.

Catabolism is the enzymatic degradation by bacteria and fungi, humification forms humus, and mineralisation releases inorganic nutrients.

Answer: (1)

AIPMT 2011 (Mains)

Keep practising — Ecosystem

2

Mass of living matter at a trophic level in an area at any time is called :

  1. Humus
  2. Detritus
  3. Standing state
  4. Standing crop
AIPMT 2011 (Prelims)
3

Of the total incident solar radiation the proportion of PAR is

  1. About 60%
  2. More than 80%
  3. Less than 50%
  4. About 70%
AIPMT 2011 (Prelims)
4

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.
AIPMT 2011 (Prelims)
5

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)
6

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)
7

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)
8

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)
9

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
10

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
11

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

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