Level 9 Chemistry Pre-Test

What is an ecosystem composed of?

• Only animals

• Communities of interdependent organisms and abiotic components

• Only plants

• Only abiotic components

Which system in animals coordinates the response to a stimulus?

• Digestive system

• Central nervous system

• Respiratory system

• Circulatory system

What is the role of neurons in the nervous system?

• To digest food

• To transmit electrical impulses

• To pump blood

• To store energy

What connects neurons to each other?

• Muscles

• Synapses

• Bones

• Ligaments

How do multicellular organisms respond to environmental changes?

• By relying on a single system

• By relying on coordinated and interdependent internal systems

• By ignoring the changes

• By changing their colour

Which of the following is an abiotic component of an ecosystem?

• Plants

• Animals

• Water

• Fungi

What is the primary function of the spinal cord in the central nervous system?

• To produce hormones

• To transmit signals between the brain and the rest of the body

• To digest food

• To store fat

Which of the following is an example of a stimulus?

• A plant growing

• A loud noise

• A rock

• A river

What is the main purpose of synapses in the nervous system?

• To store energy

• To connect neurons and allow communication

• To produce blood cells

• To digest food

Which of the following is a biotic component of an ecosystem?

• Soil

• Sunlight

• Bacteria

• Water