Nutrient Cycles (Grade 10 NSC Matric Life Sciences): Flashcards
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What a nutrient cycle describes
What a nutrient cycle describes
Movement of organic & inorganic materials through environment
Four main nutrient cycles
Four main nutrient cycles
Water, oxygen, carbon, nitrogen
Proportion of Earth's surface covered by water
Proportion of Earth's surface covered by water
Over two-thirds
% water returning to atmosphere from land via transpiration
% water returning to atmosphere from land via transpiration
About 50%
Relationship between photosynthesis & respiration
Relationship between photosynthesis & respiration
Complementary - one produces O2, the other uses it
Carbon's role in living organisms
Carbon's role in living organisms
Basic building block of all organic materials
% of atmosphere made up of nitrogen gas
% of atmosphere made up of nitrogen gas
About 78%
What nitrogen produces in organisms
What nitrogen produces in organisms
Amino acids, proteins, nucleic acids (DNA/RNA)
Ammonification
Ammonification
Bacteria convert amino acid nitrogen into ammonia
Nitrification
Nitrification
Bacteria convert ammonia to nitrate