Y11 PCD Revision Lesson Apr 2021

The central nervous system in humans is made up from what?

• Only the spinal cord
• Only the brain
• Both the spinal cord and the brain
• The spinal chord, brain and relay neurones

Which of the following statements about insulin is correct?

• Insulin is secreted by the liver and transported to the pancreas where it changes sugar into starch
• Insulin is a catalyst that destroys glucose in the blood
• Insulin is a hormone that helps to regulate the water content of the blood
• Insulin is secreted by the pancreas and it stimulates cells in the liver to convert glucose into glycogen

The main method of controlling the amount of water in the body is via the kidneys. How does this happen?

• A hormone is used to send a message to the kidney to excrete more water
• Nerve impulses from the brain are used to send a message to the kidney to excrete more water
• Both of the above
• No message is needed, it will happen automatically

Which two natural processes return carbon dioxide to the air?

• Photosynthesis and respiration
• Respiration and decomposition
• Digestion and eating
• Using nuclear fuels

How is carbon in plants passed on to the rest of the cycle?

• Only death and decay
• Only by being eaten
• Through food webs
• By forming coal

What process takes carbon dioxide from the air and makes it available to land living animals?

• Photosynthesis
• Respiration
• Lightning strikes
• Burning fossil fuels

Which of the following elements is not found in CaHCO₃?

• Calcium
• Carbon
• Cobalt
• Oxygen

An element is made up from what?

• Molecules
• Compounds
• Two or more different types of atom
• One type of atom

Group 8 is sometimes numbered as group 0 or group 18. What are the elements of this periodic table group called and why are they unreactive?

• Noble solids and they have 8 electrons in their outer energy level (shell)
• Noble liqids and they have 8 electrons in their outer energy level (shell) except helium which has 2
• Noble gases and they have a complete (full) outer energy level (shell)
• Noble elements and they have an empty outer energy level (shell)

The elements are arranged in groups and periods. What is a period on the table?

• A vertical column
• A horizontal row
• A diagonal row
• A block of columns