Biology revision grade 7

Choose the odd one out

• Alveoli

• Bronchi

• Oesophagus

• Trachea

Which process involves the release of energy from food substances in all living cells?

• breathing

• nutrition

• respiration

• digestion

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Which of the following is a sperm cell?

• A

• B

• C

• D

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Cilia are present on the surface of the cells of the trachea. The cilia of a smoker work less effectively than those of a non-smoker.

How does this affect the smoker?

• Mucus is less effectively removed from the lungs

• It is more difficult for bacteria to enter the lungs

• There is less oxygen in the lungs

• There is less carbon dioxide in the lungs

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Which of the following correctly describes the process of respiration?

• Eating to get food

• Oxidation of food to release energy

• Removal of faeces from the body

• Removal of wastes produced inside the body

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The diagrams show the arrangement of cells in a section of a green leaf.

Which arrow represents the diffusion of the most oxygen during bright sunlight?

• 
• 
• 
• 

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What is a function of the human blood system?

• carrying eggs from the ovary to the uterus

• carrying glucose from the gut to the liver

• carrying partly digested food from the mouth to the stomach

• carrying urine from the kidney to the bladder

What is a difference between red blood cells and white blood cells?

• Red blood cells contain hemoglobin, but white blood cells do not.

• Red blood cells can move on their own, but white blood cells cannot.

• Red blood cells contain a nucleus, but white blood cells do not.

• Red blood cells fight foreign bacteria, but white blood cells do not.

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Which is an example of an organism?

• a beetle
• a lake
• a rock
• a shell

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Meiosis makes sperm and egg cells. In humans, sperm and egg cells each have _____ chromosomes. Therefore a fertilized human egg cell (sperm and egg cell combined) would create a cell with _____ chromosomes.

• 23, 46
• 46, 23
• 2, 4
• 50, 100

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