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Ecosystem · Question 52

AIPMT 2012 (Mains)MCQEasy📈 Topic in 12% papers+4−1
1

The second stage of hydrosere is occupied by plants like

  1. Vallisneria
  2. Typha
  3. Azolla
  4. Salix

Answer

(1) Vallisneria

Solution

Hydrosere (succession in water) passes through: phytoplankton stage → rooted submerged stage → rooted floating stage → reed-swamp stage → sedge-meadow stage → woodland stage → forest (climax).

As per NCERT, in hydrarch succession the phytoplankton (pioneer species) are replaced with time by rooted-submerged plants.

⇒ The second stage is the rooted submerged stage, with plants like Hydrilla and Vallisneria.

∵ Azolla is a free-floating plant, Typha belongs to the reed-swamp stage and Salix to the woodland stage, they come later.

Answer: (1)

AIPMT 2012 (Mains)

Keep practising — Ecosystem

2

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)
3

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)
4

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)
5

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)
6

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)
7

The upright pyramid of numbers is absent in

  1. Pond
  2. Grassland
  3. Lake
  4. Forest
AIPMT 2012 (Prelims)
8

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)
9

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)
10

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

  1. Fragmentation
  2. Catabolism
  3. Mineralisation
  4. Humification
AIPMT 2011 (Mains)
11

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)

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