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Ecosystem · Question 56

AIPMT 2012 (Prelims)MCQMedium📈 Topic in 38% papers+4−1
1

Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels? [figure]

  1. Level PC is "rats" and level SC is "cats"
  2. Level PP is "phytoplankton" in sea and "whale" on top level TC
  3. Level PP is "pipal trees" and the level SC is "sheep"
  4. Level PC is "insects" and level SC is "small insectivorous birds"

Answer

(4) Level PC is "insects" and level SC is "small insectivorous birds"

Solution

In the pyramid, PP (producer) = 1, PC (primary consumer) = 500, SC (secondary consumer) = 50 and TC (tertiary consumer) = 10.

A single large producer supports many herbivores – this is the case of a tree supporting a large number of insects.

Insects (PC) are then eaten by fewer small insectivorous birds (SC), which are eaten by still fewer predators (TC).

(1) Rats are not 500 on one producer. (2) Phytoplankton are present in very large numbers, never 1. (3) Sheep are herbivores, so they cannot be at the SC level.

Level PC is insects and level SC is small insectivorous birds.

Answer: (4)

AIPMT 2012 (Prelims)

Keep practising — Ecosystem

2

Which one of the following is not a functional unit of an ecosystem?

  1. Energy flow
  2. Decomposition
  3. Productivity
  4. Stratification
AIPMT 2012 (Prelims)
3

The upright pyramid of numbers is absent in

  1. Pond
  2. Grassland
  3. Lake
  4. Forest
AIPMT 2012 (Prelims)
4

Which one of the following animals may occupy more than one trophic level in the same ecosystem at the same time?

  1. Lion
  2. Frog
  3. Goat
  4. Sparrow
AIPMT 2011 (Mains)
5

Both, hydrarch and xerarch successions lead to:

  1. Xeric conditions
  2. Excessive wet conditions
  3. Highly dry conditions
  4. Medium water conditions
AIPMT 2011 (Mains)
6

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

  1. Fragmentation
  2. Catabolism
  3. Mineralisation
  4. Humification
AIPMT 2011 (Mains)
7

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)
8

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)
9

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)
10

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)
11

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)

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