POGIL: Experimental Variables

The process that is occurring in the plant's cells to produce the bubbles is

• respiration

• photosynthesis

• fermentation

• digestion

Answer explanation

This process is what plants use to make food. The bubbles are oxygen, which is actually a waste product of the correct process.

Tags

NGSS.MS-LS1-6

The process that is occurring in the plant's cells to produce the bubbles is photosynthesis. Where in the cells of the plant leaf is this reaction taking place?

• cytoplasm

• ribosome

• mitochondria

• chloroplast

Answer explanation

The organelle (cell part) where this process occurs is only found in plants.

Tags

NGSS.MS-LS1-6

In the experimental set up shown below, which factor would not effect the rate of photosynthesis?

• time of day

• light intensity

• color of light

• amount of carbon dioxide available

Answer explanation

Be careful! In nature, this would effect the rate of photosynthesis. Since the question is asking about this experiment (which is happening in a lab) the correct answer wouldn't effect the rate of photosynthesis

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

In the experimental set up shown below, all the following variables are being kept the same except

• type of plant

• type of contain

• color of light reaching the plant

• amount of light reaching the plant

• number of leaves on each plant

Answer explanation

In any well run experiment, it is important to keep all variables the same EXCEPT the one you are testing.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS1-6

NGSS.MS-LS2-1

An experiment was designed to determine if chlorophyll is responsible for the growth of corn seedlings toward light. In the experiment, equal numbers of albino corn seedlings and green corn seedlings were grown at a temperature of 24°C. All other environmental conditions were the same for both groups of seedlings. The results of the experiment showed that both the albino seedlings and the green seedlings bent toward light. Which sequence of steps was most likely taken in this experiment?

• develop a hypothesis --> select suitable laboratory materials --> test the hypothesis --> formulate a conclusion

• select suitable laboratory materials --> formulate a conclusion --> develop a hypothesis --> test the hypothesis

• develop a hypothesis --> test the hypothesis --> select suitable laboratory materials --> formulate a conclusion

• formulate a conclusion --> select suitable laboratory materials --> develop a hypothesis --> test the hypothesis

Tags

NGSS.MS-ETS1-1

An experiment was designed to determine if chlorophyll is responsible for the growth of corn seedlings toward light. In the experiment, equal numbers of albino corn seedlings and green corn seedlings were grown at a temperature of 24°C. All other environmental conditions were the same for both groups of seedlings. The results of the experiment showed that both the albino seedlings and the green seedlings bent toward light. Which hypothesis is being tested in this experiment?

• Albino corn seedlings grow as fast as green corn seedlings.

• Chlorophyll is needed for corn seedlings to grow toward light.

• Differences in genotypes produce variations in corn phenotypes.

• Light is required for germination of corn.

Tags

NGSS.MS-LS1-5

An experiment was designed to determine if chlorophyll is responsible for the growth of corn seedlings toward light. In the experiment, equal numbers of albino corn seedlings and green corn seedlings were grown at a temperature of 24°C. All other environmental conditions were the same for both groups of seedlings. The results of the experiment showed that both the albino seedlings and the green seedlings bent toward light. Which is a variable that the researchers changed in this experiment?

• type of soil

• type of corn seedlings

• temperature

• light

Answer explanation

In any well run experiment, it is important to keep all variables the same EXCEPT the one you are testing.

Tags

NGSS.MS-LS1-5

A student wanted to investigate the effect of light on the rate of ripening of tomatoes. She set up four pots of the same size with identical amounts of soil, water, and type of tomato plants. Each plant was exposed to a different intensity of light as shown in the table below. The independent variable in this experiment is the

• type of tomato plant

• amount of soil provided

• color of tomatoes

• light intensity

Answer explanation

Tags

NGSS.MS-LS1-5

In an appropriately designed experiment, a scientist is able to test the effect of

• a single variable

• multiple variables

• the hypothesis

• scientific observations

Answer explanation

In any well run experiment, it is important to keep all variables the same EXCEPT the one you are testing.

Tags

NGSS.MS-PS2-2

The column headings in Model 3 each describe a variable in the experiment. What variable was purposefully changed in the experiment?

• length of leaf clipping

• number of leaves on the clipping

• percentage of light reaching the plant

• number of bubbles formed in 10 minutes

Answer explanation

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-1

NGSS.MS-LS2-3