Which experimental procedure would provide the best evidence for the effect of light on plant growth?(1 point)

Question

Responses

Measure plants receiving different amounts of light in their natural environments.
Measure plants receiving different amounts of light in their natural environments.

Plant seeds of the same variety in the same conditions and vary only the amount of light, then measure plant growth.
Plant seeds of the same variety in the same conditions and vary only the amount of light, then measure plant growth.

Plant seeds in different soils and expose them to different amounts of light, then measure plant growth.
Plant seeds in different soils and expose them to different amounts of light, then measure plant growth.

Measure plants of the same variety grown in environments that receive different amounts of light.
Measure plants of the same variety grown in environments that receive different amounts of light.
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Answer 1

The best evidence for the effect of light on plant growth would be obtained by:

Plant seeds of the same variety in the same conditions and vary only the amount of light, then measure plant growth.

This method ensures that all other variables (such as soil type, water, temperature, etc.) are held constant while only the amount of light is varied, allowing for a clear understanding of its specific effect on growth.

Answer 2

A family raises a species of fish in a pond. At the end of each summer, the family sells the fully grown fish. One year, the family notices that the fish are smaller than they had been the previous year. Which statement best explains this observation?(1 point)
Responses

The type of fish in the pond this year tended to be smaller than the type of fish last year.
The type of fish in the pond this year tended to be smaller than the type of fish last year.

There was less food available in the pond this year than last year.
There was less food available in the pond this year than last year.

There were fewer fish this year than there were last year.
There were fewer fish this year than there were last year.

There was more space in the pond this year than last year.
There was more space in the pond this year than last year.
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Answer 3

The statement that best explains the observation that the fish are smaller this year than they had been the previous year is:

There was less food available in the pond this year than last year.

Limited food availability would directly impact the growth and size of the fish, leading to smaller fish compared to previous years when more food was available.

Answer 4

A species of plant grows poorly in the shadow of a building. Which environmental need is the plant most likely lacking? (1 point)
Responses

space
space

water
water

nutrients
nutrients

sunlight

Answer 5

The environmental need that the plant is most likely lacking is:

sunlight.

Plants generally require sunlight for photosynthesis, and growing poorly in the shadow of a building suggests that they are not receiving adequate light.

Answer 6

What is the first step in solving for x in the equation 5.6(x+1.42)=7.8 ?(1 point)
Responses

Only the left-hand side was divided by 5.6.
Only the left-hand side was divided by 5.6.

Divide both sides by 5.6.
Divide both sides by 5.6.

Subtract 1.42 from both sides.
Subtract 1.42 from both sides.

Multiply both sides by 5.6.
Multiply both sides by 5.6.
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Answer 7

The first step in solving for $x$ in the equation $5.6(x+1.42)=7.8$ is:

Divide both sides by 5.6.

This step isolates the term containing $x$ by eliminating the coefficient in front of it. After dividing, you can then proceed to further isolate $x$.

Answer 8

What is the second step in solving for n in the equation 5.6(n+1.42)=7.8 ?(1 point)
Responses

Subtract 1.42 from both sides.
Subtract 1.42 from both sides.

Subtract 5.6 from both sides.
Subtract 5.6 from both sides.

Add 1.42 to both sides.
Add 1.42 to both sides.

Divide both sides by 5.6.
Divide both sides by 5.6.
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Answer 9

The second step in solving for $n$ in the equation $5.6(n+1.42)=7.8$ after dividing both sides by 5.6 is:

Subtract 1.42 from both sides.

After you've divided the equation by 5.6, you'll have $n+1.42=\frac{7.8}{5.6}$. The next step is to isolate $n$ by subtracting 1.42 from both sides.

Answer 10

What is the first step in solving for x in the equation 9.8(x−2.14)=53.9 (1 point)
Responses

Multiply both sides by 9.8.
Multiply both sides by 9.8.

Divide both sides by 9.8.
Divide both sides by 9.8.

Add 2.14 to both sides.
Add 2.14 to both sides.

Divide only the left-hand side by 9.8.

Answer 11

The first step in solving for $x$ in the equation $9.8(x-2.14)=53.9$ is:

Divide both sides by 9.8.

This step simplifies the equation by isolating the term containing $x$ on one side of the equation, so you can continue to solve for $x$. After dividing, you would have $x-2.14=\frac{53.9}{9.8}$.