Biology- TIMSS Grade 8 (2011)

Which of the following can provide the human body with long-term immunity against some diseases?

• Antibiotics

• Vitamins

• Vaccines

• Red Blood Cells

The graph indicates the number of antelopes in a certain area over a period of

time. Which of the following factors is most likely to have caused the sudden

change in population between 1999 and 2000?

• Global warming

• Absence of predators

• Depletion of the ozone layer

• Bush fires that destroyed the food supply

Bacteria that enter the body are destroyed by which type of cells?

• White blood cells

• Red blood cells

• Kidney cells

• Lung cells

In a lake near a farm the growth of algae suddenly increased. This increase was most likely due to which of the following?

• A decrease in air temperature

• A decrease in water level

• Fertiliser runoff from the farm

• Exhaust gases from farm equipment

The following table shows the classification of some animals into two categories. Which of the following was used to classify the animals?

• Organs used in breathing

• Food source

• Method of reproduction

• Pattern of movement

Which of the following best describes the purpose of cellular respiration?

• To provide energy for cell activities

• To produce sugar for storage in cells

• To release oxygen for breathing

• To supply carbon dioxide for photosynthesis

Which of the following statements is true about organisms that are producers?

• They use energy from the sun to make food.

• They absorb energy from a host animal.

• They get energy from eating living plants.

• They get energy by breaking down dead plants and animals.

Which organ in a frog has a function similar to the function of lungs in a bird?

• Kidney

• Skin

• Liver

• Heart

The diagram shows a plant cell. What is the function of the part of the cell labeled X?

• It stores water

• It makes food

• It absorbs energy

• It controls activities

Which equation summarizes the process of respiration?

• water + carbon dioxide + energy > sugar + oxygen

• oxygen + sugar > carbon dioxide + water + energy

• carbon dioxide + oxygen + water > sugar + energy

• sugar + carbon dioxide + energy > oxygen + water