Science year 6 Quiz B

What are the main parts of the human nervous system?

• Brain and Spinal cord

• Brain and Kidney

• Neural network and Kidney

• Spinal cord and Heart

Answer explanation

The main parts of the human nervous system are the brain and spinal cord, which together form the central nervous system. The other options incorrectly include organs that are not part of the nervous system.

What is the role of the central nervous system?

• Connects the central nervous system to sensory organs

• Acts as a center to receive information from sensory organs and coordinate response

• Coordinates quick unconscious actions

• Controls kidney function

Answer explanation

The central nervous system acts as a center to receive information from sensory organs and coordinate responses, making it crucial for processing sensory input and directing appropriate actions.

What is the main function of the peripheral nervous system?

• Connects the central nervous system to sensory organs

• Acts as a memory storage area

• Filters blood in the kidneys

• Regulates body temperature

Answer explanation

The peripheral nervous system connects the central nervous system to sensory organs, allowing for communication between the brain and the body. This is essential for processing sensory information.

Which description fits an elliptical-shaped galaxy?

• Irregular in shape and scattered

• Flat with spiral arms

• Round or oval with a smooth appearance

• A small cluster of stars

Answer explanation

An elliptical-shaped galaxy is characterized by its round or oval shape and smooth appearance, lacking the distinct features of spiral arms or irregular shapes found in other galaxy types.

What best describes an irregular-shaped galaxy?

• Has a clear, round or oval shape

• Contains a well-defined spiral structure

• Appears scattered without a distinct shape

• Is shaped like a flat disk

Answer explanation

An irregular-shaped galaxy does not have a clear form, appearing scattered and lacking a distinct shape, which distinguishes it from regular galaxies that have defined structures like spirals or disks.

Which structure of the nervous system is responsible for reflex actions?

• Brain

• Peripheral nervous system

• Spinal cord

• Cerebellum

Answer explanation

The spinal cord is responsible for reflex actions as it processes these automatic responses without needing input from the brain, allowing for quick reactions to stimuli.

What best describes a spiral-shaped galaxy?

• A flat, disk-like structure with arms spiraling outward

• Irregular and scattered without a defined shape

• Oval-shaped and smooth with no spiral structure

• A small cluster of randomly placed stars

Answer explanation

A spiral-shaped galaxy is best described as a flat, disk-like structure with arms spiraling outward, which distinguishes it from irregular, oval, or random star clusters.

What happens when the nervous system detects a dangerous stimulus, like touching something hot?

• It slowly processes the sensation and increases heart rate

• It instantly triggers a reflex to pull away

• It sends a message to the liver to release heat

• It begins to regulate body temperature

Answer explanation

When the nervous system detects a dangerous stimulus, it instantly triggers a reflex to pull away, protecting the body from harm. This rapid response is crucial for avoiding injury.

Which of the following statements is true about the peripheral nervous system?

• It only sends signals to the brain

• It connects the central nervous system to limbs and organs

• It controls all voluntary movements

• It stores long-term memories

Answer explanation

The correct statement is that the peripheral nervous system connects the central nervous system to limbs and organs, facilitating communication between the brain and the rest of the body.

Which part of the galaxy is usually located at the center of a spiral galaxy?

• A star cluster

• The spiral arms

• A supermassive black hole

• A planetary nebula

Answer explanation

The center of a spiral galaxy typically contains a supermassive black hole, which exerts a strong gravitational pull, influencing the motion of stars and gas in the galaxy.