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WorksheetsGR7 Science Practice Items
Total questions: 19
Worksheet time: 10mins
A damaged hip joint can cause pain and decreased mobility. A hip replacement can restore mobility and reduce pain. During hip replacement surgery a portion of the damaged bone is removed and replaced with a man-made material.
Which of these describes a material that is best to use for a hip replacement?
a soft material that bends with the movement of the body
a mesh material that allows fluid in the body to pass through it
a hard metal material that supports the weight of the body
a solid dissolvable material that disappears after the body heals
The graph shows atmospheric CO2 levels over time. Which activity most likely contributed to the changes in atmospheric CO2 levels after the year 1800?
transforming vacant lots into parks and recreational areas
growing seasonal produce in community gardens
driving electric vehicles with low emissions
producing goods in large factories
A sample of pure cesium (Cs) reacts with water. Under standard conditions, which of these elements react in a similar way to water as cesium (Cs)?
silicon (Si)
neon (Ne)
potassium (K)
iridium (Ir)
Gold jewelry can be made in different colors. The difference in color depends on the percentage of each metal within the jewelry. Which type of gold is a pure substance?
Rose Gold
White Gold
18K Gold
24K Gold
A group of students investigated how cycling of matter occurs in plants and animals. Their setup and data are shown. If CO2 lowers the pH of water, which statement best explains the processes that occurred in the beaker?
The aquatic plant released CO2 that the snail used to make sugars.
The water pH lowered as CO2 was consumed by the aquatic plant.
The snail breathed in CO2 from the water.
The snail released CO2 into the water.
The model shows a pure substance in a glass jar undergoing a change of state. Based on the model, the changes observed are most likely caused by:
a decrease in the total mass of the substance under the glass jar without a change in temperature or pressure.
an increase in the temperature of the substance without a change in pressure.
a decrease in the temperature of the substance without a change in pressure.
an increase in the atmospheric pressure outside the glass jar without a change in temperature.
Which table best describes both mitosis and meiosis?
Process:
Mitosis - One cell becomes four cells. - Genetically identical; Meiosis - One cell becomes two cells. - Genetically different.
Process:
Mitosis - One cell becomes four cells. - Genetically different; Meiosis - One cell becomes two cells. - Genetically different.
Process:
Mitosis - One cell becomes two cells. - Genetically identical; Meiosis - One cell becomes four cells. - Genetically different.
Process:
Mitosis - One cell becomes two cells. - Genetically identical; Meiosis - One cell becomes four cells. - Genetically identical.
The graph shows the boiling points of three elements in Group 17 of the periodic table. Which point on the graph best predicts the boiling point of chlorine, Cl₂?
point W
point X
point Y
point Z
Based on Figure 2, what type of movement do the particles exhibit at room temperature?
Low movement
Medium movement
High movement
What is the role of mosses in the tundra ecosystem?
Producer
Consumer
Decomposer
Scavenger
Falcons are known to eat what in the tundra ecosystem?
All animals
Fish
Insects
Plants
Weasels are known to eat what in the tundra ecosystem?
Herbivores
Carnivores
Insects
Fruits
Hawks have what role in the tundra ecosystem?
Eats all animals
Pollinates flowers
Disperses seeds
Decomposes organic matter
Which two statements best explain how carbon moves between organisms in the tundra ecosystem?
M. Mosses use carbon from the atmosphere.
P. Shrubs use carbon from the biosphere.
R. Snow Geese use carbon from the biosphere.
S. Falcons use carbon from the atmosphere.
T. Weasels use carbon from the atmosphere.
Snow Geese are classified as which of the following in the tundra ecosystem?
Herbivore
Carnivore
Omnivore
Decomposer
Which statement best describes the relationship between photosynthesis and cellular respiration in the tundra ecosystem?
Hawks produce carbon dioxide and water, which weasels convert into sugars and oxygen.
Lemmings produce sugar and water, which hawks convert into carbon dioxide and oxygen.
Grasses produce sugars and oxygen, which lemmings convert into carbon dioxide and water.
Mosses produce carbon dioxide and water, which weasels convert into sugars and oxygen.
Lemmings have what role in the tundra ecosystem?
Herbivore
Carnivore
Decomposer
Producer
Which two statements best describe the movement of carbon and oxygen in the tundra ecosystem?
Producers take in oxygen and release carbon dioxide during photosynthesis.
Producers take in carbon dioxide and release oxygen during photosynthesis.
Consumers take in oxygen and release carbon dioxide during cellular respiration.
Consumers take in carbon dioxide and release oxygen during cellular respiration.
Producers and consumers take in carbon dioxide and release oxygen during photosynthesis.
