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Ecosystem · Question 51

AIPMT 2012 (Mains)MCQEasy📈 Topic in 50% papers+4−1
1

The rate of formation of new organic matter by rabbit in a grassland, is called :

  1. Net productivity
  2. Gross primary productivity
  3. Secondary productivity
  4. Net primary productivity

Answer

(3) Secondary productivity

Solution

As per NCERT, secondary productivity is defined as the rate of formation of new organic matter by consumers.

∵ A rabbit is a herbivore, i.e. a consumer, not a producer ⇒ its rate of formation of new organic matter is secondary productivity.

Answer: (3)

AIPMT 2012 (Mains)

Keep practising — Ecosystem

2

The second stage of hydrosere is occupied by plants like

  1. Vallisneria
  2. Typha
  3. Azolla
  4. Salix
AIPMT 2012 (Mains)
3

Identify the likely organisms (a), (b), (c) and (d) in the food web shown below : [figure]

  1. (a) deer, (b) rabbit, (c) frog, (d) rat
  2. (a) squirrel, (b) cat, (c) rat, (d) pigeon
  3. (a) dog, (b) squirrel, (c) bat, (d) deer
  4. (a) rat, (b) dog, (c) tortoise, (d) crow
AIPMT 2012 (Mains)
4

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
AIPMT 2012 (Prelims)
5

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)
6

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)
7

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)
8

The upright pyramid of numbers is absent in

  1. Pond
  2. Grassland
  3. Lake
  4. Forest
AIPMT 2012 (Prelims)
9

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)
10

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)
11

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

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

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