7.4

When you add baking soda to vinegar, the mixture fizzes as CO₂ gas is produced. If you added water to the vinegar before you mixed it with the baking soda, what effect would this have on the rate of CO₂ production?

• in would increase

• it would decrease

• it wouldn't change

Tags

NGSS.MS-PS1-2

The blue numbers in the image below represent ________

• Charges

• coefficients

• subscripts

• none of the answers are correct

A chemical reaction during which plants use radiant energy from the Sun to convert carbon dioxide and water into sugar (glucose)

• Radiant energy

• Chlorophyll

• Phytoplankton

• Photosynthesis

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

An incomplete diagram of the process of photosynthesis is provided.

(See attached diagram)

What is the missing component that correctly replaces the question mark to complete the diagram?

• Soil nutrients

• Water

• Thermal energy

• Glucose

Tags

NGSS.MS-LS1-6

NGSS.MS-LS1-7

Which of the following best summarizes photosynthesis?

• A chemical reaction involving nitrogen and other atmospheric gases

• An adaptation of plants that allows them to add nutrients to the soil

• A process by which plants produce sugar using the energy of sunlight

• An exchange of gases between animals and the air or water of their habitat

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Students are observing an aquatic plant. They understand that the bubbles they see rising from the cut stem of the plant are the gases produced during photosynthesis. Which of the following observations provides the best evidence that light is the source of energy for photosynthesis?

• Plants observed in artificial or in natural light were both seen to produce bubbles.

• The frequency of bubbling increases in bright light and slows to a stop in darkness.

• The orientation of the light seems to have no effect on the production of bubbles.

• The bubbles always rise to the surface of the water, moving towards the light.

Tags

NGSS.MS-LS1-6

The concentration of carbon dioxide in parts per million (ppm) was measured for a closed container in several situations. Which of the following data collected would demonstrate the action of photosynthesis?

• When multiple plants were put in the container, carbon dioxide concentration never got above 1,000 ppm.

• When carbon dioxide concentration went from 800 to 1,000 ppm the temperature in the container went up.

• Plants in the container kept in darkness did not lower the concentration of carbon dioxide below 800 ppm.

• When the container included a plant exposed to light, carbon dioxide concentration went from 800 to 600 ppm.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

When the container included a plant exposed to light, carbon dioxide concentration went from 800 to 600 ppm.

(See attached table)

How could the students use one of these solutions to gather evidence for the action of photosynthesis?

• Use Fehling’s solution with the roots of several different species of plants, after boiling them for several minutes

• Pump the air from a closed container containing a plant through a sample of lime water

• Use Fehling’s solution on plant leaves exposed to light and on plant leaves covered in aluminum foil for a week

• Grind up all parts of a plant, expose them to heat, collect the gas, and use lime water to test it

Tags

NGSS.MS-LS1-6

Which form of energy is used to power photosynthesis?

• Thermal energy

• Radiant energy

• Chemical energy

• Nuclear energy

Tags

NGSS.MS-LS1-6

What is the pH level of a neutral solution?

• 7.0

• 7.4

• 8.0

• 6.5