Science 9 Pre Test

What important activity takes place in the lungs?

• Food is digested.

• Oxygen is exchange for carbon dioxide

• Liquid waste is filtered from the blood.

• The trachea is exchange for the larynx.

Which of these is the job of the respiratory system?

• holding up the body and giving it support and shape.

• Gas exchange between the external environment and the body's circulatory system.

• Breaking down food for it to be used by the body.

• Prevents food from going down the lungs.

What important process happens in the netlike structure labeled A?

• Nitrogen and oxygen are exchanged.

• Carbon dioxide and oxygen are exchanged.

• Nitrogen and carbon dioxide remain constant.

• Carbon dioxide and oxygen diffuse into the blood.

Which of the following is the best way of taking care of our respiratory and circulatory systems?

• Maintaining a healthy lifestyle free from stress

• Maintaining a stressful lifestyle free from worries.

• Maintaining an unhealthy lifestyle with full of fun

• Maintaining a happy lifestyle with no limit of food & drinks

Which of the following lifestyle changes is most effective in reducing the risk of cardiovascular diseases?

• Increasing sugar intake

• Avoiding fruits and vegetables

• Regular physical exercises and a balanced diet

• Smoking and alcohol consumption

Which is NOT an example of incomplete dominance?

• A pink flower produced from red and white flowers

• A flower that is both red and white produced from red and white flowers

• Curly-haired and straight-haired individuals producing wavy-haired offspring

• A highly spotted dog and a non-spotted dog producing puppies with a few spots

A man heterozygous for blood type A marries a woman heterozygous for blood type B. What is the chance that their first child will have type O blood?

• 0%

• 25%

• 50%

• 75%

What information can be obtained from a Punnett square?

• Genotype of offspring

• Phenotypic ratio of offspring

• Phenotype of offspring

• All the above information

When cells break food into chemical energy, it undergoes three major processes: glycolysis, Krebs cycle and electron transport. Which of these processes of aerobic respiration produces the most ATP?

• Glycolysis

• Krebs cycle

• Electron transport chain

• none of these

Which of the following processes release energy?

• I. Glycolysis

• II. Calvin cycle

• III. Krebs cycle

• IV. Electron transport chain