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Ecosystem · Question 54

AIPMT 2012 (Prelims)MCQEasy📈 Topic in 25% papers+4−1
1

Which one of the following is not a gaseous biogeochemical cycle in ecosystem?

  1. Sulphur cycle
  2. Nitrogen cycle
  3. Phosphorus cycle
  4. Carbon cycle

Answer

(3) Phosphorus cycle

Solution

As per NCERT, nutrient cycles are of two types: gaseous (reservoir in the atmosphere) and sedimentary (reservoir in the Earth's crust).

Nitrogen and carbon cycles are gaseous; the sulphur cycle also has an atmospheric phase (SO2, H2S).

The natural reservoir of phosphorus is rock (phosphates) and there is no respiratory release of phosphorus into the atmosphere,

the phosphorus cycle is a sedimentary cycle.

Answer: (3)

AIPMT 2012 (Prelims)

Keep practising — Ecosystem

2

Identify the possible link "A" in the following food chain: Plant insect frog "A" Eagle

  1. Wolf
  2. Rabbit
  3. Cobra
  4. Parrot
AIPMT 2012 (Prelims)
3

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"
AIPMT 2012 (Prelims)
4

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)
5

The upright pyramid of numbers is absent in

  1. Pond
  2. Grassland
  3. Lake
  4. Forest
AIPMT 2012 (Prelims)
6

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)
7

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)
8

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

  1. Fragmentation
  2. Catabolism
  3. Mineralisation
  4. Humification
AIPMT 2011 (Mains)
9

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)
10

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)
11

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)

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