Level 9 Biology Pre-Test

What is the primary function of the central nervous system in animals?

• To digest food

• To coordinate responses to stimuli

• To circulate blood

• To produce hormones

Which part of the central nervous system is responsible for processing information and making decisions?

• Spinal cord

• Brain

• Neurons

• Synapses

What is the role of neurons in the nervous system?

• To store energy

• To transmit electrical impulses

• To produce enzymes

• To filter waste

What connects neurons to each other in the nervous system?

• Axons

• Synapses

• Dendrites

• Myelin

How do multicellular organisms respond to changes in their environment?

• By relying on a single cell

• Through coordinated and interdependent internal systems

• By changing their DNA

• By producing more cells

Which of the following is NOT a part of the central nervous system?

• Brain

• Spinal cord

• Peripheral nerves

• Cerebellum

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

• To produce red blood cells

• To transmit signals between the brain and the body

• To digest food

• To store fat

Which of the following best describes a synapse?

• A type of cell that fights infection

• A gap between two neurons where impulses are transmitted

• A muscle that contracts in response to stimuli

• A hormone that regulates metabolism

What is the primary role of the brain in the central nervous system?

• To pump blood

• To process sensory information and coordinate responses

• To produce digestive enzymes

• To store nutrients

Which of the following systems is NOT directly involved in responding to environmental changes in multicellular organisms?

• Nervous system

• Digestive system

• Endocrine system

• Immune system