BS 1 - Organisms and their environment

BS 1 - Organisms and their environment
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Slide 1: Diapositive
BiologieMiddelbare schoolhavo, vwoLeerjaar 3

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BS 1 - Organisms and their environment

Slide 1 - Diapositive

Environment
Environment: surroundings where an organism lives
Ecology: Relationship between organisms and their environment
Biotic factors: Influence that comes from living nature
Abiotic factors: Non-living influences of nature

Slide 2 - Diapositive

Slide 3 - Vidéo

Levels of ecology
1. Individual: An organism Ex: effect of temp on 1 elephant
2. Population: Group of individuals of the same species in an area. Ex: influence of amount of rain on a population of elephants
3.Community: Populations of different species living together is an area. Ex: woodland: beech trees, ferns, earthworms, shrews (birds).
4. Ecosystem: Community and the biotope (abiotic factors) Woodland, pond, dunes, and meadows.
5. Biosphere: The part of the Earth where life is possible.

Slide 4 - Diapositive

Slide 5 - Vidéo

Food chain
Food chain: algae         water flea         perch         pike

Slide 6 - Diapositive

Food web
-When food chains are interrelated
-form a network
-consists of living organisms
-producers, herbivores and carnivores

Slide 7 - Diapositive

Example: Marine food web

Slide 8 - Diapositive

Biomass
Organisms are composed of energy: carbohydrates(, proteins (15%) and fats (20%) = biomass

Biomass is contained in each level of a food chain.

Biomass decreases at each level of the food chain.

Energy is lost as heat and waste.

Slide 9 - Diapositive

Accumulation
Plants take up substance from their environment (CO2, minerals)
Also toxic substance - heavy metals
Ex. cadmium, mercury, lead, arsenic and tin
Animals eat the plants
Toxins get stored in fatty tissue of animals. 
Build up in the animals at the end of the food chain = accumulation

Slide 10 - Diapositive

What did we learn?
  1. Abiotic vs. biotic factors
  2. Levels of ecology
  3. Food chain vs. food web
  4. Biomass and accumulation 

Slide 11 - Diapositive

To Do?
Read 6.1 
VWO: 6 t/m 9

Slide 12 - Diapositive