Lesson 4

Nutrient Cycling

What you should be doing between lessons

1. Completing the task given in the lesson and if required, saving in the pupil folder or submitting to Mrs McDougall Welch.

2. Making notes and using your own study techniques to LEARN the work of the lesson. This may involve completing extra Scholar activities or producing mind maps, flashcards, summary notes.

3. Making a note of anything that you have tried to understand but cannot.You should be doing at least 1 hour of work for every hour of lessons!

Carbon cyclecarbon dioxide

in the air

photosynthesis

consumers

respirationBurning fuels

producers

detritus

decay

Nitrogen in the air

NITRATES

Protein in plants

Protein in animals Nitrogen in

dead bodies and wastes

eatingexcretion and

death

Decomposition by bacteria

Absorption by roots

Nitrogen Fixing by bacteria

Denitrification by bacteria

The nitrogen cycle

Protein in plants

Protein in animals Nitrogen in

dead bodies and wastes

eatingexcretion and

death

Ammonification by bacteria and fungi

Nitrification by bacteria

Absorption by roots

DecompositionAnd nitrogen cycle

Nitrate Nitrite Ammonia

NitrobacterNitrosomonasNitrococcus

Assimilation

Nitrate gets used to make compounds in plants

Nitrogen in the air

Nitrogen Fixing by bacteria(anaerobic)

Denitrification by bacteria(anaerobic)

Nitrogen fixing and

denitrification

Nitrate

Free livinge.g. cyanobacter

Symbiotice.g. Rhizobium

N-fixing requires the enzyme ‘nitrogenase’

Carbon cycle

carbon dioxide in the air

photosynthesis

consumers

respirationBurning fuels

producers

detritus

decay

Task

Read pages 10 – 13 in the Student Monograph. Also read the ‘box’ on pages 24/25.

Read the Chapter ‘Nutrient Cycling’ in the Scholar Book.1. Produce a poster detailing the nitrogen cycle.

This poster should include the chemical reactions and the names of the bacteria and processes involved. Include as much detail as possible. You may need to do a rough draft of this first. Include the information on pages 24/25.

2. Repeat for the Carbon Cycle and the Phosphorus Cycle. These are simpler and will be less involved than the Nitrogen Cycle.