Science Biology

Science Biology

  • Submitted By: ripudaman
  • Date Submitted: 01/15/2009 2:30 PM
  • Category: Science
  • Words: 1451
  • Page: 6
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Science Biology Review [SNC 2D1]

Chapter 1
1.) i.) Population refers to all the individuals of one species that occupy a certain geographical area at a certain time. Example: In the year 2000, the population of Canada was 30, 000, 000.
ii.) Community refers to groups of different species of organisms that interact with each other. E.g. Community of soil refers to the living organisms in the soil.
iii.) Ecosystem is a collection of biotic and abiotic components which interact with each other in any chosen area. E.g. Earth as an en ecosystem.
iv.) Biome is a collection of ecosystems that are similiar or related to each other in that the dominant form of plant life is the same. E.g. The boreal forest biome is dominated by coniferous trees.

2.) An example of a biotic factor would be soil. An example of an abiotic factor would be trees, plants, etc.


Well Why are decomposers important for any ecosystem? Decomposers break down materials and feed on dead/ decayed matter and provide rich nutrients for the soil and the environment.

4.) How much energy is passes to the next trophic level?
Only 10% of the energy is passed on to the next trophic level.
This is because the energy is used by the organism to stay alive- life processes such as reproduction, movement, growth , waste, other activities.

5.) Why food chains do not have more than four links?
Food chains usually do not have more than four links because energy available reduces at each step along the food chain. This is the main reason behind why food chains usually have less than 4 links.

6.) The difference among these pyramids is that pyramid of number shows the number of organisms in an ecosystem and it can be inverted. Pyramid of biomass shows the mass of the organisms in an ecosystem , this pyramid can also be inverted. Pyramid of energy flow shows the decrease in energy that is available to each successive trophic level.

7.) Biological Magnification is the...

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