ACT Science Question and Answers

Question 1

Researchers looked at a species of termite's foraging environments across the country. The degree of internal disintegration caused by termites chewing the bark on a tree served as a proxy for the termite population in that tree. The investigation also measured how well-tolerated shade was by each type of tree. Shade tolerance for the tree species used in this experiment could be divided into two categories: shade tolerant (ST) and intermediate shade (IS). Finally, they noted the typical monthly rainfall for the site where the species was being monitored. The data are summarized in the graph below. According to scientists' hypotheses, tree species with higher average rainfall would exhibit the highest levels of breakdown. Additionally, they proposed that the trees' increased shade would encourage more termites, which would lead to increased decomposition.
The amount of termites in a particular tree species and the amount of rainfall on average are related in that .

Accepted Answer

higher rates of rainfall accompany greater quantities of termites.

Answer

The scientists' hypothesis states that 'tree species with higher average rainfall would exhibit the highest levels of breakdown' and 'increased shade would encourage more termites, which would lead to increased decomposition.' Since decomposition is a proxy for termite population, this implies a direct relationship: higher rainfall leads to higher decomposition, which means higher quantities of termites. Therefore, the hypothesis suggests that higher rates of rainfall accompany greater quantities of termites.

Question 2

Researchers looked at a species of termite's foraging environments across the country. The degree of internal disintegration caused by termites chewing the bark on a tree served as a proxy for the termite population in that tree. The investigation also measured how well-tolerated shade was by each type of tree. Shade tolerance for the tree species used in this experiment could be divided into two categories: shade tolerant (ST) and intermediate shade (IS). Finally, they noted the typical monthly rainfall for the site where the species was being monitored. The data are summarized in the graph below. According to scientists' hypotheses, tree species with higher average rainfall would exhibit the highest levels of breakdown. Additionally, they proposed that the trees' increased shade would encourage more termites, which would lead to increased decomposition.
What connection exists between the degree of decomposition and shade tolerance?

Accepted Answer

Tree species with higher shade tolerance have higher levels of decomposition.

Answer

The scientists proposed that 'the trees' increased shade would encourage more termites, which would lead to increased decomposition.' Since 'shade tolerant (ST)' indicates higher shade tolerance compared to 'intermediate shade (IS)', and decomposition is a proxy for termite population, the hypothesis directly links higher shade tolerance to increased decomposition. Therefore, tree species with higher shade tolerance are expected to have higher levels of decomposition.

Question 3

To determine whether calcium can have an impact on gene regulation, scientists undertake an experiment. High calcium concentrations are thought to interact with the proteins Cs3 and Gfy, increasing the transcription of the genes F4597 and BC392. The experiment's methodology is outlined below.

Identify the genes BC392 and F4597. Create a vector with the two genes within yeast cells. growing yeast cells Grow yeast cells in two different growth media: plate A, which is deficient in calcium, and medium B, which has calcium supplements (plate B)

What data outcomes from the experiment would be consistent with the theory?

Accepted Answer

Plate B shows increased F4597 and BC392 gene activity.

Answer

The hypothesis states that 'High calcium concentrations are thought to interact with the proteins Cs3 and Gfy, increasing the transcription of the genes F4597 and BC392.' Plate B is the experimental group with calcium supplements. Therefore, if the hypothesis is correct, the genes F4597 and BC392 should show increased activity in Plate B due to the presence of calcium.

Question 4

Nitra-Grow is a chemical additive that may be added to plants to aid in growth, and a team of scientists wanted to investigate its effects. Three different plant test groups received the same amount of water, type of soil, and amount of sunlight. No further chemicals were applied to Plant A. 5g of Nitra-Grow was given to Plant B. To investigate if Nitra-Grow performed any better than a straightforward household product based on nitrogen, Plant C was fed 5g of ammonia. After that, the plants are measured five days in a row to determine their average height (in cm).
Imagine if the experiment was carried out once more with Plant D. 15g of Nitro-Grow and 15g of ammonia were supplied to Plant D. What outcomes might be anticipated?

Accepted Answer

There is not enough information to determine how well the plant will perform.

Answer

The experiment only tested 5g of Nitra-Grow and 5g of ammonia. Plant D receives 15g of both, which is outside the tested range. We cannot assume a linear relationship or predict the effects of such a significantly higher dose without further experimentation, as there could be saturation, toxicity, or other unknown interactions at higher concentrations.

Question 5

Nitra-Grow is a chemical additive that may be added to plants to aid in growth, and a team of scientists wanted to investigate its effects. Three different plant test groups received the same amount of water, type of soil, and amount of sunlight. No further chemicals were applied to Plant A. 5g of Nitra-Grow was given to Plant B. To investigate if Nitra-Grow performed any better than a straightforward household product based on nitrogen, Plant C was fed 5g of ammonia. After that, the plants are measured five days in a row to determine their average height (in cm).
What connection exists between plant height and the number of days?

Accepted Answer

As time increases, the plant height increases.

Answer

The problem states that plants are measured 'five days in a row to determine their average height.' Generally, plants grow over time, so it is expected that their height would increase as the number of days (time) increases. This is the most logical and common biological trend for plant growth.

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ACT Science Question and Answers