Hypothesis And Experimentation 4.4 Flashcards
A small photosynthetic organism lives in freshwater ponds. It rises and falls in the water column over the course of a day. A scientist was in determining whether the rise towards the surface of the pond over the course of the morning was due to certain wavelengths of light. The s brought water samples from a pond into their laboratory and exposed different samples to narrow wavelengths of visible light. Using filters, light spectrum was broken into 10 bands of 30 nm each from violet to red. In each sample, the scientist measured the location of the organi water column. Several samples were exposed to sunlight, while several other samples were kept in the dark Which of the following is the independent variable?
Visible light
A small photosynthetic pond dweller
Darkness
Location in the water column
Visible light
A small photosynthetic organism lives in freshwater ponds. It rises and falls in the water column over the course of a day. A scientist was interested in determining whether the rise towards the surface of the pond over the course of the morning was due to certain wavelengths of light. The scientist brought water samples from a pond into their laboratory and exposed different samples to narrow wavelengths of visible light. Using filters, the visible light spectrum was broken into 10 bands of 30 m each from violet to red. In each sample, the scientist measured the location of the organism in the water column. Several samples were exposed to sunlight, while several other samples were kept in the dark.
Which of the following explains why some samples were exposed to sunlight and some were kept in darkness?
These samples are used to calibrate the filters.
Sunlight is the dependent variable and darkness is the independent variable.
Sunlight is the independent variable and darkness is the dependent variable.
These are examples of control groups.
These are examples of control groups.
Which of the following describes a hypothesis?
A set of methods used to carry out experiments
Designed to minimize bias, maximize precision and accuracy of the data, and be streamlined and robust
An informed, logical, and plausible explanation of observations made about the natural world, which serves as the basis for additional experimentation
Away of organizing data
An informed, logical, and plausible explanation of observations made about the natural world, which serves as the basis for additional experimentation
A small photosynthetic organism lives in freshwater ponds. It rises and falls in the water column over the course of a day. A scientist was determining whether the rise towards the surface of the pond over the course of the morning was due to certain wavelengths of light brought water samples from a pond into their laboratory and exposed different samples to narrow wavelengths of visible light. Usin light spectrum was broken into 10 bands of 30 nm each from violet to red. In each sample, the scientist measured the location of the water column. Several samples were exposed to sunlight, while several other samples were kept in the dark.
Which of the following is the dependent variable?
Visible light send through filters
Location of the organisms in the water column
Sunlight
A small photosynthetic pond dweller
Location of the organisms in the water column
When designing and performing experiments, which of the following is why most of the variables are kept the same between the experimental and control groups ?
Manipulating only one variable at a time makes the experiments shorter, so a scientist can perform more of them per day.
Manipulating only one variable at a time makes the experiments easier to perform.
Manipulating only one variable at a time makes it simpler to identify correlations and likely causal relationships.
It is less expensive to manipulate only one variable at a time.
Manipulating only one variable at a time makes it simpler to identify correlations and likely causal relationships.
practice a
Red the passage. Then answer the following questions bused on previous research, a group of scientiats bellent hat fruit Ales are attracted to rotting fruit. They desion an speriment to test this hypothesis. The scientiata place 20 tit flies in a chamber. On one side of the chamber, they place an unripe banana. On the other side of the chamber, they place a rotten banana. After 5 minutes, they count how many fruit flies are on each side of the chamber.
- Which of the following is the dependent variable in the experiment?
A. Ripeness of the banana
B. Size of the chamber
C. Number of fruit flies placed in the chamber
D. Number of fruit flies on each side of the chamber
D. Number of fruit flies on each side of the chamber
4 which of the following statements is the hypothesis in the experiment?
A. Fruit flies are attracted to any type of fruit.
B. If presented with a rotten banana, fruit flies will be attracted to it.
C. Fruit flies live longer when exposed to unripe fruit.
D. Fruit flies ripen fruit faster than when there are no fruit flies.
If presented with a rotten banana, fruit flies will be attracted to it
Read the passage. Then answer He following questions
Juan Carlos hypothestzes that changing the color of light siven to plants will affect their growth. He decides to test his prediction in an experiment. He sets up four groups of plants, giving each a different color of light. Each group has 1o radish plants all abour 10 em tall. He keeps all of them in the same temperature and gives them with the same amount of water each day. After 10 days, he records thase results:
Which of the following is the independent variable in this experiment?
A, Color of light
B. Growth of the plant
C. Number of plants
D. Mass of the plants
Color of light
- Which of the following should be controlled in this experiment? (Select all that apply.)
A. Color of light
B. Growth of the plant
C. Soil conditions
D. Amount of water
Soil conditions
Amount of water
- Reread the experimental design regarding the effect of light color on plant growth. Which of the following is a hypothesis that would be supported by the data collected by Juan Carlos?
A. Plant growth is unaffected by light color.
B. If plants are grown in blue or red light, they will grow at faster rates than those grown in green or yellow light.
C. If plants are grown in green or yellow light, they will grow at faster rates than those grown in blue or red light.
D. Green or yellow light inhibits plant growth.
B. If plants are grown in blue or red light, they will grow at faster rates than those grown in green or yellow light.
