Which variable appears to control leaf production in these plants?

Temperature at which plants were grown

Which of these would be the best conclusion regarding the experimental results shown?

This species of plant grew best between 19 C and 26 C.

Which statement is an inference based on this information?

Milkweed seeds are dispersed by wind.

What is the dependent variable in this experiment?

Average number of new leaves per week

Different foods were left out for 2 days. What question is best answered by this experiment?

Which food attracts the most flies?

Which statement best describes an effect of pH on the functioning of salivary amylase?

Amylase functions most effectively at a pH of about 7.

Which factor would need to be known before a valid conclusion could be based upon these data?

The original average height of grass

Which of the following best describes when a hypothesis becomes a theory?

when data consistently supports it from many trials

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Scientific Investigation

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Questions 9

Answers

1
Which variable appears to control leaf production in these plants?
Number of plant seedlings
Number of daylight hours
Average number of new leaves per week
Temperature at which plants were grown
2
Which of these would be the best conclusion regarding the experimental results shown?
Plants will not grow above 26 C.
This species of plant grew best between 19 C and 26 C.
The ideal temperature for all plant growth is 26 C.
The tallest this species of plant will ever grow is 50 cm.
3
Which statement is an inference based on this information?
Maple seeds have a membrane-like extension.
Burdock seeds have short, peg-like extensions.
Plant seeds have different shapes.
Milkweed seeds are dispersed by wind.
4
What is the dependent variable in this experiment?
Temperature at which plants were grown
Number of plant seedlings
Number of daylight hours
Average number of new leaves per week
5
Different foods were left out for 2 days. What question is best answered by this experiment?
How much energy do flies get from different foods?
How does a fly digest different foods?
Which food attracts flies from the greatest distance?
Which food attracts the most flies?
6
Which statement best describes an effect of pH on the functioning of salivary amylase?
Amylase functions most effectively at a pH of about 4.
Amylase breaks down protein instead of starch at pH 9.
Amylase functions most effectively at a pH of about 7.
Amylase cannot break down starch at pH values less than 7.
7
Which factor would need to be known before a valid conclusion could be based upon these data?
The density of the phosphate solutions
The length of study period
The original average height of grass
The mineral content of the potting soil
8
What is the most current and reliable source of information for scientific research on cells?
popular news magazine
cell biology textbook
newspaper
scientific journal
9
Which of the following best describes when a hypothesis becomes a theory?
when the official scientific method is followed
when a website is created to display the theory
when one good set of scientific data supports a theory
when data consistently supports it from many trials

Scientific Investigation Flashcards | StudBud