Science Biology Essay

1476 words - 6 pages

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 ...view middle of the document...

7.) Biological Magnification is the process by which toxic substances accumulate in increasingly high concentrations in progressively higher trophic levels. { [Easier Language] - It occurs when toxic substances pass up through trophic levels}.
An example would be - DDT and other substance that undergo biological magnification have two properties that make them dangerous:
• They are not biodegradable. This means that decomposer organisms cannot readily break them down into harmless substances.
• They are fat soluble (not water soluble). Therefore, they can accumulate in the body tissues of animals, particularly in the fat. They are not broken down and excreted in watery urine.

8.) Carrying Capacity refers to the maximum number of individuals of a species that an ecosystem can support. There are four main factors which affect Carrying Capacity:
• Materials and Energy
• Food Chain
• Competition - {Intraspecific and Interspecific Competition}
• Population Density - {Dependant and Independent Density Factors}

9.) Density-dependent factor is a factor that affects a population based on its population, including, amount of resources(food, water, shelter, disease, etc). Density factors usually cause the population to either increase or decrease according to the positive or negative affect it has on an ecosystem.

Density-independent factors is a factor that affects a population in a manner that does not vary according to the density of the population, it is acting on its own, for example, fire and floods and other natural disasters.

Chapter 2

10.) Earth is considered to be a closed system because the resources do
not come inside the Earth. The food, the resources that we need do not come from outside the earth. Everything gets recycled and is used over and over again.

11.) In the notes! (notebook)- Carbon Cycle

12.) In the notes! (notebook)- Nitrogen Cycle

13.) An organic farmer can increase the amount of nitrogen in the soil by planting leguminous crops instead of non-leguminous. He would do this to reduce the use of the nitrogen fertilizers. Also, the organic farmer could use the waste matter from animals as fertilizers to enrich the soil in nutrients. Most important of all the farmer could reduce the use of pesticides or just stop using pesticides.

14.) The impact of human activities on the amount of carbon dioxide in the atmosphere –the combustion of fossil fuels releases a number of gases, including carbon dioxide.
16.) Sustainable development is development which meets the needs of the present without compromising the ability of future generations to meet their own needs. An example of sustainable activity would be to plant more trees in the environment to help the production of more oxygen in the atmosphere, and the reduction of CO2 levels. An example of a non-sustainable activity would be things such as deforestation, overgrazing.

Chapter 3

17.) There are four...

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