From 125f735477c28b4f8ab9599cbf96bc31b7a3facc Mon Sep 17 00:00:00 2001 From: James Su Date: Fri, 26 Apr 2019 18:10:34 +0000 Subject: [PATCH] Update Study_Sheet.md --- Grade 9/Science/SNC1DZ/Study_Sheet.md | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) diff --git a/Grade 9/Science/SNC1DZ/Study_Sheet.md b/Grade 9/Science/SNC1DZ/Study_Sheet.md index 9082d18..c018989 100644 --- a/Grade 9/Science/SNC1DZ/Study_Sheet.md +++ b/Grade 9/Science/SNC1DZ/Study_Sheet.md @@ -399,7 +399,7 @@ efficiency varies from `5%` to `20%` energy available between successive trophic |:----|:----------|:------| |Water Cycle|Continuous movement of water on, above and below the surface of the Earth|| |Carbon Cycle|Main Pathway – in and out of living matter|| -|Nitrogen Cycle| +|Nitrogen Cycle|Main Pathway - In and out of plants and is helped by bacteria|| ## Water Cycle @@ -450,8 +450,22 @@ atmosphere, river to lake) - ### Nitrogen Fixation - - +- Most of the nitrogen used by living things is taken from the atmosphere by certain bacteria in a process called `nitrogen fixation`. +- These microorganisms convert nitrogen gas into a variety of nitrogen containing compounds such as nitrates, nitrites, and ammonia +- Lightning and UV radiation also fix small amounts of it +- Humans add nitrogen to soil through fertilizer +- 3 ways nitrogen to get fixed + 1. Atmopheric Fixation + 2. Industrial Fixation + 3. Biological Fixation + - 2 types + 1. Free living Bacteria + - Highly specialized bacteria live in the soil and have the ability to combine atmospheric nitrogen with hydrogen to make ammonium(NH4+). + - Nitrogen changes into ammonium. + 2. Symbiotic Relationship Bacteria + - Bacteria live in the roots of legume family plants and provide the plants with ammonium(NH4+) in exchange for the plant's carbon and a protected biome. + + ## Benefits of Succession - Provides a mechanism by which ecosysmtems maintain their long term sustainability. - Allows ecosystems to recover from natural or human caused distrubances.