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Ecosystem

AIPMT 2014MatchingEasy📈 Topic in 38% papers+4−1
Ques. 1AIPMT 2014

Match the following and select the correct option:

  1. (a) (i), (b) (ii), (c) (iii), (d) (iv)
  2. (a) (iii), (b) (ii), (c) (iv), (d) (i)
  3. (a) (iv), (b) (i), (c) (iii), (d) (ii)
  4. (a) (ii), (b) (i), (c) (iv), (d) (iii)

Answer

(4) (a) (ii), (b) (i), (c) (iv), (d) (iii)

Solution

(a) Earthworm feeds on dead organic matter (detritus) and breaks it into smaller particles detritivore (ii).

(b) Succession begins with the pioneer species that first invade a bare area (i).

(c) Pollination by bees and other insects is an ecosystem service (iv).

(d) Population growth depends on natality (birth rate) (iii).

(a) (ii), (b) (i), (c) (iv), (d) (iii)

Answer: (4)

Keep practising — Ecosystem

Ques. 2AIPMT 2014

Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks. [figure]

  1. A Detritus, B Rock minerals, C Producer, D Litter fall
  2. A Litter fall, B Producers, C Rock minerals, D Detritus
  3. A Rock minerals, B Detritus, C Litter fall, D Producers
  4. A Producers, B Litter fall, C Rock minerals, D Detritus
Ques. 3AIPMT 2014

If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain? Plant mice snake peacock

  1. 0.0002 J
  2. 0.002 J
  3. 0.2 J
  4. 0.02 J
Ques. 4NEET 2013

Natural reservoir of phosphorus is :

  1. Fossils
  2. Rock
  3. Sea water
  4. Animal bones
Ques. 5NEET 2013

Secondary productivity is rate of formation of new organic matter by :

  1. Parasite
  2. Decomposer
  3. Producer
  4. Consumers
Ques. 6NEET 2013

Which one of the following processes during decomposition is correctly described ?

  1. Catabolism – Last step in the decomposition under fully anaerobic condition
  2. Leaching – Water soluble inorganic nutrients rise to the top layers of soil
  3. Fragmentation – Carried out by organisms such as earthworm
  4. Humification – Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate
Ques. 7NEET 2013 (Karnataka)

Which one of the following is a primary consumer in maize field ecosystem ?

  1. Phytoplankton
  2. Lion
  3. Grasshopper
  4. Wolf
Ques. 8NEET 2013 (Karnataka)

When man eats fish which feeds on zooplankton which have eaten small plants, the producer in the chain is :

  1. Zooplankton
  2. Fish
  3. Small plants
  4. Man
Ques. 9AIPMT 2012 (Mains)

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
Ques. 10AIPMT 2012 (Mains)

The second stage of hydrosere is occupied by plants like

  1. Vallisneria
  2. Typha
  3. Azolla
  4. Salix
Ques. 11AIPMT 2012 (Mains)

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

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