Test - TCAP Success Grade 7 Science Post Test

1 pt Standard: 7.LS1.6 DOK: 3

The red grouse population in Scotland goes through a reduction cycle every 4 – 8 years. During this time, the number of birds may be reduced by a factor of more than 1000. The reason for the reduction is a widespread infection with a parasitic nematode.

Select the correct answer. Which statement best describes the effect of the nematode on the population of the red grouse?

The nematode causes the red grouse to exceed carrying capacity.

The nematode causes population growth.

The nematode is a density-dependent factor in population reduction.

The nematode is a density-independent factor in population reduction.

1 pt Standard: 7.LS1.9, 2.1 DOK: 3

Which of the following statements is not true about cellular respiration?

It involves the release of energy in the form of ATP.

It takes place in the presence of enzymes.

It is carried out in the mitochondria of animal cells only.

It is the process in which a cell uses oxygen to convert glucose into ATP.

1 pt Standard: 7.LS1.6, 1.9, 2.1 DOK: 1

14.

Select the correct answer. How do producers get energy?

They get it from the biotic factors in an ecosystem.

They get it from abiotic factors in the ecosystem.

They get it from the decomposing organisms.

They get it from humans.

1 pt Standard: 7.PS1.4 DOK: 2

21.

Liquid hydrogen peroxide undergoes a chemical reaction, decomposing into hydrogen gas and oxygen gas. The reaction is as follows:

$H_{2} O_{2} (1) \to H_{2} (g) + O_{2} (g)$

Select the correct answer. If the reaction began with 50 grams of hydrogen peroxide, what is the total mass of the final product?

20 grams of H $_{2}$ AND o $_{2}$

50 grams of H $_{2}$ AND o $_{2}$

50 grams of O $_{2}$ , because it is the heavier element

zero grams, because gas has no mass

1 pt Standard: 7.PS1.1, 1.2, 1.4, 1.6 DOK: 1

29.

Mikal observed a chemical change. What did he observe?

new matter forming

old matter disappearing

chemical bonds forming

electrons growing larger

1 pt Standard: 7.PS1.1, 1.2, 1.4, 1.5 DOK: 2

32.

Elements found in Group 18 are called noble gases. Select the correct answer. What property of an element would allow it to be placed in Group 18?

number of protons greater than 90

neutrons in equal number to the number of protons

low chemical reactivity due to full valance electrons

radioactivity with a half-life greater than 36 days

1 pt Standard: 7.LS1.6, 3.1, 3.2, 3.3 DOK: 3

37.

Use the information and your scientific knowledge to answer the question.

Four groups of rabbits migrate to distant parts of the Arctic tundra.

Group A has heterozygous dominant rabbits for brown fur and homozygous recessive rabbits for white fur.

Group B has rabbits homozygous dominant for brown fur and a few individual rabbits which are heterozygous dominant for brown fur.

Group C has rabbits homozygous dominant.

Group D has rabbits homozygous recessive.

Over time, which group is most likely to survive to the third or fourth generations in the Arctic tundra?

Group A

Group B

Group D

1 pt Standard: 7.LS1.6, 3.1, 3.3 DOK: 1

40.

On the Galapagos Islands many different species of iguana exist. Some iguanas are large, black, and eat food found in the ocean. Other iguanas are smaller, different colored, and eat food found on the island.

Select the correct answer. What process most likely explains the differences seen in the iguana species?

convergent evolution

bottleneck

natural selection

artificial selection

1 pt Standard: 7.LS1.6, 1.7, 3.2, 3.3 DOK: 1

44.

Which statement best supports the answer to question 43.

Over time, immigration and birth determine the degree of population growth. The growth is positive.

How much the population grows and how many organisms take up a unit of space determines population dynamics. Density and growth rate are characteristics of population dynamics.

Over time, emigration and death determine the degree of population growth. The growth rate is negative.

As a population expands, it uses up resources and more effort is put into obtaining resources. Competition increases. A downturn in the population brings it back to its carrying capacity.

1 pt Standard: 7.LS1.1 DOK: 1

51.

Select the correct answer. During photosynthesis and respiration, which nutrient is exchanged between plants and animals?

oxygen

water

nitrogen

phosphates

1 pt Standard: 7-PS1.2, 1.6 DOK: 2

58.

Barbara made a graph of how water changes from one state to the next.

Which statements are true about Barbara’s graph Changing the States of Water? Select 3 correct answers.

While the liquid changes to vapor, the liquid releases energy, but the temperature does not increase. Once all of the liquid turns to steam, the temperature of the steam remains the same.

As ice melts, it continues to absorb energy, but the temperature doesn’t change again until all of the ice has melted.

Once water is in a liquid state, its temperature decreases until it reaches 80 °C. At that point, the water boils and turns to steam.

Ice can exist at temperatures below 0 °C, but once ice reaches 0 °C, it starts to melt.

Adding heat causes the temperature of water to rise and change phases.

While the vapor changes to a liquid, the vapor absorbs energy, but the temperature increases. Once all of the steam turns to liquid, the temperature of the liquid increases.

1 pt Standard: 7.PS1.1, 1.2, 1.5 DOK: 1

62.

Which substance is a compound?

1 pt Standard: 7.PS1.1, 1.2, 1.4, 1.5 DOK: 1

69.

In the chemical equation below, identify the circled numbers.

subscripts

coefficients

reactants

products

TCAP Success Grade 7 Science Post Test

TCAP Success Grade 7 Science Post Test Sample