Can you remember what these words mean?

Vertebrate; Quadrat; Herbivore;

Pyramid of number; Producer;

Carnivore; Food chain;

Food web; Habitat;

Invertebrate; Pyramid of biomass; Consumer; Vascular;

Non-vascular; Pooter.

Looking at populations

Open your books at the homework you did over the holidays

Swap books with your neighbour

Get a different coloured pen

Grass Sheep Fleas

Beech Tree Caterpillars Blackbirds

Grass Snails Thrushes Stoat

Rose bush Greenfly Ladybirds Parasites

Question 1 2 marks for each correctly drawn food chain:1 for animals in correct order1 for arrows in correct direction

Grass Sheep Fleas

Grass

Sheep

Fleas

Pyramid of Numbers4 marks for each correctly drawn pyramid of numbers:

2 for the bars being the correct length1 for labelling the bars1 for using a ruler

Tree Caterpillars Blackbird

Pyramid of Numbers

Grass Snails Thrushes Stoat

Pyramid of Numbers

Rose bush Greenfly Ladybirds Parasites

Pyramid of Numbers Add up marks for question 1, maximum is 24

Model answer:a) Pesticide is sprayed onto crops, each insect eats some of the

crop, so has eaten some pesticide. One small bird eats thousands of insects, therefore has eaten lots of pesticide. A predator like the hawk will eat hundreds of small birds. Each small bird has a lot of pesticide in it, so the hawk now has a very large dose of pesticide.

b) The amount of pesticide taken in by organisms as you move along the food chain will increase.

Question 2 a) Total 4 marks:3 for correct reasoning1 for use of full sentence

b) Total 2 marks:1 for correct answer1 for full sentence

Question 3

• Uses include:-Stops insects eating crops.

-Farmers can produce more crops, therefore more food.

-People do not have to get rid of pests by hand.

• Dangers include:-Pesticides can be dangerous to consumers higher up

the food chain.

-Pesticides can be harmful to the environment.

Total 10 marks:3 marks for clearly laid out and easy

to read posters7 marks for arguments: interesting

and correct points made and evidence of further research.

Complete the topic summary