Q.1
Which of the following process helps in nutrient conservation?
  • a) Mineralisation
  • b) Immobilisation
  • c) Leaching
  • d) Nitrification
Q.2
Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.... [AIPMT 2014]
unit-10_ch-1_que_no-422_img_no1.png
  • a) A: Detritus; B: Rock minerals; C: Producer; D: Litter fall
  • b) A:Producers; B: Litter fall C: Rock minerals; D:Detritus
  • c) A: Rock minerals; B:Detritus; C: Litter fall; D:Producers
  • d) A:Litter fall; B: Producers; C:Rock minerals; D:Detritus
Q.3
In an ecosystem the rate of production of organic matter during photosynthesis is termed as : …[AIPMT 2015]
  • a) Net productivity
  • b) Net primary productivity
  • c) Gross primary productivity
  • d) Secondary productivity
Q.4
Secondary Succession takes place on/in : …[AIPMT 2015]
  • a) Newly cooled lava
  • b) Bare rock
  • c) Degraded forest
  • d) Newly created pond
Q.5
The mass of living material at a trophic level at a particular time is called : …[AIPMT 2015]
  • a) Standing crop
  • b) Gross primary productivity
  • c) Standing state
  • d) Net primary productivity
Q.6
A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called:- …[AIPMT-2016]
  • a) Ley farming
  • b) Contour farming
  • c) Strip farming
  • d) Shifting agriculture
Q.7
Which of the following is a characteristic feature of cropland ecosystem ? …[AIPMT-2016]
  • a) Absence of soil organisms
  • b) Least genetic diversity
  • c) Absence of weeds
  • d) Ecological succession
Q.8
The term ecosystem was coined by …[AIPMT-2016]
  • a) E.P. Odum
  • b) A.G. Tansley
  • c) E. Haeckel
  • d) E. Warming
Q.9
Which of the following would appear as the pioneer organisms on bare rocks? …[AIPMT-2016]
  • a) Lichens
  • b) Liverworts
  • c) Mosses
  • d) Green algae
Q.10
Natural reservoir of phosphorus is …[NEET 2013]
  • a) Sea water
  • b) Animal bones
  • c) Rock
  • d) Fossils
Q.11
Which one of the following processes during decomposition is correctly described?... [NEET 2013]
  • a) Fragmentation - Carried out by organisms such as earthworm
  • b) Humification - Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate
  • c) Catabolism - Last step in the decomposition under fully anaerobic condition
  • d) Leaching - Water soluble inorganic nutrients rise to the top layers of soil
Q.12
The primary producers of the deep-sea hydrothermal vent ecosystem are ...
  • a) Blue-green algae
  • b) Coral reefs
  • c) Green algae
  • d) Chemosynthetic bacteria
Q.13
Which ecosystem has the maximum biomass? ….[NEET- 2017]
  • a) Forest ecosystem
  • b) Grassland ecosystem
  • c) Pond ecosystem
  • d) Lake ecosystem
Q.14
Presence of plants arranged into well defined vertical layers depending on their height can be seen best in : ….[NEET- 2017]
  • a) Tropical Savannah
  • b) Tropical Rain Forest
  • c) Grassland
  • d) Temperate Forest
Q.15
ost animals that live in deep oceanic waters are... [ ReAIPMT 2015]
  • a) Detritivores
  • b) Primary consumers
  • c) Secondary consumers
  • d) Tertiary consumers
Q.16
An association of individuals of different species living in the same habitat and having functional interactions is... [ ReAIPMT 2015]
  • a) Population
  • b) Ecological niche
  • c) Biotic community
  • d) Ecosystem
Q.17
In which of the following both pairs have correct combination ... [ ReAIPMT 2015]
  • a) Gaseous nutrient cycle → Sulphur and Phosphorus Sedimentary nutrient cycle → Carbon and Nitrogen
  • b) Gaseous nutrient cycle → Carbon and Nitrogen Sedimentary nutrient cycle → Sulphur and Phosphorus
  • c) Gaseous nutrient cycle → Carbon and sulphur Sedimentary nutrient cycle → Nitrogen and phosphorus
  • d) Gaseous nutrient cycle → Nitrogen and sulphur Sedimentary nutrient cycle → Carbon and Phosphorus
Q.18
During ecological succession ...[ ReAIPMT 2015]
  • a) the changes lead to a community that is in near equilibrium with the environment and is called pioneer community
  • b) the gradual and predictable change in species composition occurs in a given area
  • c) the establishment of a new biotic community is very fast in its primary phase
  • d) the number and types of animals remain constant
Q.19
Natality refers to ... ... [NEET 2018]
  • a) Death rate
  • b) Birth rate
  • c) Number of individuals leaving the habitat
  • d) Number of individuals entering a habitat
Q.20
What type of ecological pyramid would obtained with the following data ? [NEET 2018] Secondary consumer : 120 g Primary consumer : 60 g Primary producer : 10 g
  • a) Inverted pyramid of biomass
  • b) Pyramid of energy
  • c) Upright pyramid of numbers
  • d) Upright pyramid of biomass
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