About Ecology

Following are some of the multiple choice questions on the Ecology with answers that will help the students in developing their knowledge.

Ecology MCQ

1. What is the term for each step in the transfer of energy and matter within a biological community?

  • energy path
  • food web
  • trophic level
  • food pyramid

2. What is an ecological model of the relationships that form a network of complex interactions among organisms in a community from producers to decomposers?

  • food web
  • an ecosystem
  • food chain
  • a population

3. Study of interactions between organisms and their environment

  • niche
  • community 
  • ecology
  • ecosystem

4. plants that convert energy from the sun

  • decomposer
  • primary consumer
  • secondary consumer
  • producer

5. Soil and sediments is created by the physical and chemical ____________ of igneous rock.

  • Destabilization 
  • Expansion
  • Weathering 
  • Sublimation 

6. Approximately 90 percent of energy iconsumed by an organism is lost to ___

  • Growth
  • Inefficiencies in its metabolism 
  • Repairing cells
  • Carbon dioxide

7. Nitrogen makes up _____ percent of the atmosphere.

  • 66%
  • 78%
  • 90%

8. Organisms that breaks down and absorbs nutrients from dead organisms

  • consumer
  • trophic level
  • decomposer
  • species

9. As you move upward, from level to level, in an energy pyramid, energy _____.

  • increases
  • decreases
  • stays the same
  • increases exponentially

10. A collection of organisms that make up a community as well as all of the nonliving aspects of the environment.

  • Population
  • Community
  • Habitat
  • Ecosystem

11. A graphic illustration that shows each trophic level and the amount of useable energy contained within.

  • Food chain
  • Food web
  • Energy Pyramid
  • All of these

12. The living portions of the ecosystem.

  • Biotic factors
  • Abiotic factors

13. An illustration that uses arrows to show the MANY possible directions in which matter and energy can pass through the organisms in an ecosystem.

  • Food chain
  • Food web
  • Energy Pyramid
  • Succession Map

14. The amount of energy that usually transfers from one trophic level to the next...

  • 10%
  • 20%
  • 80%
  • 50%

15. Which one is not a consumer?

  • anemone 
  • bear
  • shark
  • vulture

16. What does every food chain start with? (Even if it's not drawn or written there!)

  • producers
  • sun
  • consumer
  • decomposers

17. What Biome is covered in a dense canopy and an understory?

  • Tropical Rain Forest
  • Desert
  • Tundra
  • Tropical Savanna

18. What Biome is very dry; receives very little rainfall?

  • Tropical Rain Forest
  • Desert
  • Tundra
  • Tropical Savanna

19. What percentage of energy is passed on to the next trophic level?

  • 5%
  • 10%
  • 50%
  • 90%

20. Which event would not cause secondary succession?

  • forest fire
  • flooding of a valley
  • volcanic lava flow
  • tornado

21. A lion that eats a zebra that eats grass is a

  • primary consumer
  • secondary consumer
  • tertiary consumer
  • quaternary consumer

22. Introduced species disrupt ecosystems because they are a/an

  • Keystone Species
  • Endemic Species
  • Invasive Species
  • Native Species

23. Which is an example of where primary succession could occur?

  • a glacier melts and exposes new rocks
  • natural fire burns a prairie
  • a corn field is abandoned and left to overgrow
  • flood covers a piece of land

24. What would be a good example of a primary consumer?

  • carnivore
  • detrivore
  • decomposer
  • herbivore

25. What would happen within a few months after the formation of a volcanic island?

  • pioneer species would grow
  • no pioneer species would grow
  • trees and large plants would grow
  • rich, organic soil would be present

26. Mistletoe grows and spreads on trees, taking their nutrients:

  • predation
  • parasitism
  • mutualism
  • commensalism

27. The nonliving aspects of an ecosystem.

  • Abiotic factors
  • Biotic factors

28. A collection of organisms that belong to different populations but all live in the same area and interact with one another.

  • Population
  • Ecosystem
  • Community
  • Ecosphere

29. Evaporation of water from the leaves of a plant gives of purified water to be evaporated.

  • precipitation
  • concentration
  • transpiration
  • evaporation

30. Individuals that can breed with one another make up a

  • species
  • population
  • community
  • ecosystem

31. The air we breathe is only ____% oxygen.

  • 10
  • 21
  • 78
  • 90

32. Organisms that obtains its energy from abiotic sources, such as sunlight or inorganic chemicals

  • Autotroph
  • Heterotroph
  • Omnivore
  • Carnivore

33. In the Article "The Critical Link", breaking down barriers that deny women access to health care, family planning, education, land ownership, employment and credit is linked to ________

  • Higher Mortality Rate
  • Higher Fertility Rate
  • Lower Fertility Rate
  • Lower Mortality Rate

34. Which is not a biome found in North America?

  • Mojave Desert
  • Grasslands of the Great Plains
  • Everglades / Coastal Plain
  • Tropical Rain Forest 

35. An underground reservoir of water is known as ______

  • An Estuary 
  • An Aquifer
  • Sublimation 
  • Permafrost

36. An important attribute of a K-strategist species is _____

  • Nurture their young
  • Exponential Growth
  • Opportunistic
  • Relatively low body mass

37. Which of these is not a characteristic share by all living things

  • Growth and Development
  • Reproduction
  • Movement
  • Homeostatis 

38. Which biome, because of its climate and amount of rainfall, has the largest number of species of plants and animals?

  • Tundra
  • Rainforest
  • Desert
  • Pineforest

39. Where an organism lives

  • habitat
  • niche 
  • heterotrogh
  • biosphere

40. Non-living factor that affects an ecosystem

  • biotic factor
  • abiotic factor
  • food chain 
  • biome

41. Which of the following leads to a decrease in biodiversity?

  • protection of ecosystems
  • pollution control
  • selective cutting
  • introduction of exotic or invasive species

42. A carbon "sink" is best described as:

  • a reservoir that readily releases carbon to another reservoir
  • a carbon reservoir that stores more carbon that it is releasing
  • something that causes carbon to leak out to the atmosphere
  • a carbon reservoir that is releasing more carbon than it is taking in

43. Nitrogen fixation processes nitrogen from which of the following sources?

  • lightning
  • fertilizers
  • dead plants
  • atmosphere

44. Organisms that relies on other organisms for food; consumer

  • herbivore
  • decomposer
  • heterotroph
  • species

45. All the organisms in a particular location, including their nonliving environment

  • ecosystem
  • carnivore
  • niche
  • population

46. What does fungi do to dead plants and animals?

  • Leave them there
  • Decompose them
  • Wait for other animals to eat them
  • Move away

47. Series of steps in which organisms transfer energy by eating and being eaten

  • foodweb
  • consumer
  • food chain
  • omnivore

48. Consumer that eats plants

  • heterotroph
  • herbivore
  • producer
  • community

49. Members of a species in a defined area

  • Ecosystem
  • community
  • biodiversity
  • population

50. The energy at each trophic level in the pryamid of energy decreases by a factor of ____.

  • 10
  • 1
  • 100
  • 2

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