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Ecosystem · Question 66

AIPMT 2010 (Mains)MCQMedium📈 Topic in 38% papers+4−1
1

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

  1. B
  2. A
  3. D
  4. C

Answer

(1) B

Solution

As per NCERT, in most ecosystems all the pyramids — of number, of energy and of biomass — are upright, i.e., producers are more in number than the herbivores, and herbivores are more in number than the carnivores.

⇒ Representation B has the broadest base (producers) and narrows towards the top, showing the upright pyramid of numbers.

Answer: (1)

AIPMT 2010 (Mains)

Keep practising — Ecosystem

2

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)
3

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)
4

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
5

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
6

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
7

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
8

About 70% of total global carbon is found in:

  1. Grasslands
  2. Agroecosystems
  3. Oceans
  4. Forests
AIPMT 2008
9

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
10

Which one of the following is not used for construction of ecological pyramids ?

  1. Rate of energy flow
  2. Dry weight
  3. Fresh weight
  4. Number of individuals
AIPMT 2006
11

Which of the following is expected to have the highest value (g/m2/yr) in a grassland ecosystem ?

  1. Net production (NP)
  2. Secondary production
  3. Tertiary production
  4. Gross production (GP)
AIPMT 2004

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