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Home / Class Room / Study Guide / Key Stage 3 / Science 1

Exercise: 1 2 3 4 5 6 7 8 9 >>

Science

Exercise 1 - Life Processes, Cells & Classification

Life Processes
All living things are made up of cells. Cells form the most basic building blocks of life. There are seven basic processes that are common to all living things - these are called LIFE PROCESSES. They are:

Movement
Respiration
Sensitivity
Growth
Reproduction
Excretion
Nutrition

The first letter of every life process spells out MRS GREN - this is how most people remember the seven processes.

Animal and Plant Cells
Please look at the two cells below.

Cell A

Cell B

a. Which cell is an animal cell?

b. Which cell is a plant cell?

Look at the parts of the cells above (labelled with numbers)
Can you name the different parts of each cell?

1 =

2 =

3 =

4 =

5 =

6 =

7 =

8 =

Cell Functions
Do you know which part of the cell performs the following functions?

1) What controls the cell?

2) Where do all the chemical reactions take place?

3) What contains all the information necessary to to produce a new living organism?

4) What holds the cell together and controls what passes in and out of the cell?

5) What contains a weak solution of salts and sugar (called cell sap)?

6) What contains a green substance called chlorophyll?

Differences between Animal and Plant Cells
Below are some statements about cells. Can you tell if they refer to animal or plant cells?

1) The nucleus is normally centred within the cell.

2) There are chloroplasts within the cell.

3) The cell has a vacuole.

4) The cell has a cell wall.

5) The majority of the cell is cytoplasm.

6) The nucleus is off centre within the cell.

Classifications
Scientists use classification to sort all living organisms into groups. Animals are split into two groups - Vertebrates (animals with backbones) and Invertebrates (animals without backbones).

Vertebrates are split into five groups as follows:

Fish, Mammals, Amphibians, Reptiles and Birds.

From the characteristics listed below, can you name the correct group within the Vertebrate classification?

1) They have smooth moist skin, live on water and land, but breed in water.

2) They have feathers and wings, most can fly and they lay eggs.

3) They have dry scaly skin and live on land.

4) They live in water, have fins and scales and breathe through gills.

5) They are warm blooded, have hair on their bodies, give birth to live young and the mothers feed their young milk.

Invertebrates are split into six groups:
Cnidarians, Flatworms, Roundworms, Segmented worms, molluscs and Echinoderms.

From the characteristics listed below, can you name the correct group within the Invertebrate classification?

1) They have a flat body and a mouth at one end.

2) Their body is divided into segments.

3) They have a shell and a muscular root.

4) They have a long thread-like body.

5) They have spiny skins and a pattern of five parts.

6) They have sac-like bodies with tentacles.

If you thought there was one more group within the Invertebrates classification that we hadn't mentioned, you were correct. There are actually seven sub-groups within Invertebrates. The missing group is called Arthropods. All Arthropods have jointed legs and hard outer skeletons. However Arthropods are split into four further sub-groups. They are:

Arachnids, Crustaceans, Insects and Centipedes.

From the characteristics listed below, can you name the correct group within the Arthropod classification?

1) They have many pairs of legs.

2) They have a hard, outer skeleton.

3) Their body is in two parts with four pairs of legs.

4) They have three parts to their body, three pairs of legs and two pairs of legs.

Exercise: 1 2 3 4 5 6 7 8 9 >>