Ecology 6.2 +6.3

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

Today's lesson

Review food webs, chains, and feeding relationships

Discuss the nitrogen and carbon cycle

WHICH OF THESE TERMS CONTAIN BOTH BIOTIC AND ABIOTIC FACTORS.

1. COMMUNITY
2. POPULATION
3. BIOTOPE
4. ECOSYSTEM

How many different species does the mountain lion eat according to this food web?

How many different species does the mountain lion eat according to this food web?

1. 1
2. 2
3. 3
4. 4

Why is it always producers that are at the start of a food chain / food web?

How many omnivores are in this food web? Give the name(s) of the organism(s).

How many omnivores are in this food web? Give the name(s) of the organism(s).

Nutrient cycle

A nutrient cycle shows the route of nutrients through nature. It is always in a cycle.

Decomposers make a food web into a nutrient cycle.

Nutrient cycle

6.3 Cycles

In an ecosystem, every substance goes through it's own cycle.

Water cycle

Carbon cycle

Nitrogen cycle

Which molecules in our bodies have Carbon or nitrogen?

For photosynthesis water is needed. What other substance does it need?

1. Glucose
2. carbon dioxide
3. oxygen
4. nitrogen

The carbon cycle

The carbon cycle

How do living organisms return carbon to the atmosphere in the carbon cycle?

1. respiration and photosynthesis
2. decomposition and respiration
3. decomposition
4. none of the above

Take a look at the picture. Is this a food web or a nutrient cycle? Explain your answer.

The nitrogen cycle uses N- compounds

_{Nitrogen is used by plants as a}

_{compound in their cells}

_{(think DNA, amino acids)}

_{Needed for growth/recuperation}

_{Which compound? NO3- /NH4+/N2?}

_{Depends on WHERE it is§}

What is the effect of 'Nitrogen' in the form of fertilizers leaking into the water?

1. Coastal dead zones
2. Certain plants start to grow very fast
3. Microbes that feed on dead plants use up all Oxygen and fishes die
4. All of the above

To do

Read paragraph 6.3

work out the knowledge and skills list