Grade 9 Biology Study Materials

What is the function of red blood cells?

• To carry oxygen using haemoglobin.

• To fight infections in the body.

• To help in blood clotting.

• To produce hormones.

What are the three types of blood vessels?

• Arteries, veins, and capillaries.

• Arteries, nerves, and muscles.

• Veins, bones, and tissues.

• Capillaries, ligaments, and tendons.

What is the role of auxins in phototropism?

• Auxins accumulate on the shaded side of the plant, causing cell elongation and bending towards light.

• Auxins are responsible for the absorption of water in roots.

• Auxins help in the process of photosynthesis by producing chlorophyll.

• Auxins cause the plant to grow away from the light source.

What is the difference between the CNS and PNS?

• CNS includes the brain and spinal cord; PNS includes nerves connecting the CNS to the rest of the body.

• CNS includes only the nerves; PNS includes the brain and spinal cord.

• CNS and PNS both include only the brain.

• CNS and PNS are two names for the same system.

What happens during systole?

• The heart contracts to pump blood.

• The heart relaxes to fill with blood.

• The lungs expel carbon dioxide.

• The kidneys filter waste from blood.

A capillary is:

• a large blood vessel

• a small blood vessel

• a type of nerve cell

• a type of muscle fiber

Sickle cell anemia is caused by:

• A deficiency of iron in the diet

• A mutation in the hemoglobin gene

• A viral infection

• A lack of vitamin B12

Which part of the blood transports hormones and waste products?

• Red blood cells

• White blood cells

• Plasma

• Platelets

Which type of blood vessel has valves?

• Arteries

• Capillaries

• Veins

• All of the above

What is the main function of white blood cells?

(a)