Human effects on the planet

Human effects on the planet

Multiple Choice

A population is...

• the number of plants or animals in the area at any one time

• the number of organisms in one country

• all the organisms of one species living in the same place at the same time.

Open Ended

What can you conclude about the number of births and deaths per year up to the year 1450?

Open Ended

Suggest reasons for the shape of the graph between 1550 and 1950

Here is a graph that predicts world populations up to the year 2100

Open Ended

Why do you think that there are 3 prediction lines?

Open Ended

Name 3 things that might affect the numbers of humans or animals in a population

Fill in the Blanks

Fill in the Blanks

Multiple Choice

Which of these is NOT a tertiary consumer in the food web?

• Thrush

• Dragonfly

• Eagle

• Frog

Open Ended

Explain how a DECREASE in the populations of frogs and dragon flies could affect the population of butterflies.

Extension: Why is this problematic?

Open Ended

Name 3 things that might affect the numbers of plants in a population

Open Ended

Why do we use fertilisers?

Multiple Select

Which elements do fertilisers contain to help plants grow?

• Nitrogen

• Potassium

• Carbon

• Phosphorus

Multiple Choice

What happens to the excess nutrients from the fertilisers that the plants don't use?

• They evaporate and then fall back onto the ground with the rain

• The are washed into rivers and lakes by the rain and irrigation

• They are eaten by animals and they affect their growth

Multiple Select

Which of these organisms take in the fertiliser?

• Algae

• Phytoplankton

• Water plants

• Fish

Multiple Choice

This algal bloom...

• covers the surface of the water

• covers the river or lake bed

Open Ended

How are plants that live below the surface affected? Why?

Multiple Choice

The population of decomposers...

• increases

• decreases

Open Ended

What happens to the fish and other life in the lake? Why?

Open Ended

How could this affect the ecosystem/food web in the area?