1.5 Simple keys

What is a dichotomous key used for?

• Playing music.

• Cooking recipes.

• Drawing pictures.

• Identifying and categorizing different organisms or objects.

• Opening closed doors.

How do biologists use keys to identify organisms?

• By making careful observations of their features

• By guessing randomly

• By asking other organisms

• By using a magic spell

Most arthropods are insects.

• True.

• False.

What is the main characteristic of insects?

• Two parts to their bodies and four legs

• No legs at all

• Four wings and eight legs

• Three parts to their bodies and six legs

How many named species of insects are there?

• Nearly a million

• Ten

• One hundred

• One thousand

What percentage of insects are beetles?

• Approximately 33%

• Approximately 75%

• Approximately 50%

• Approximately 77%

What do all beetles have over their wings?

• A tough cover.

• A soft cover.

• A transparent cover.

• No cover.

How many species of ladybirds are there?

• Five thousand

• One million

• One hundred

• Ten thousand

What is the main characteristic of ladybirds?

• Small beetles with round, brightly coloured bodies

• Large beetles with square, dark bodies

• Medium-sized beetles with long, striped bodies

• Tiny beetles with oval, dull bodies

All beetles species are red with black spots.

• True.

• False.