RC Science

Li and Mohammed perform an investigation in which four beakers of water are set up with different conditions of plants and sunlight. A diagram is provided.The water in all four beakers began with the same amount of dissolved carbon dioxide. The most reasonable prediction is that, at the end of the investigation, the beaker with the lowest concentration of carbon dioxide will be which one?

• beaker a

• beaker b

• beaker c

• beaker d

Tags

NGSS.MS-LS1-6

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Mrs. Martin is conducting an investigation with her science class. She has the class record various observations of an elodea plant in a fish tank. Shown here is a sample of student observation.Which data best connects an observation to the explanation of that observation in terms of photosynthesis?

• The leaves are used by the plant to take oxygen from the water.

• The larger plants have absorbed more sugar from the water.

• The bubbles are the carbon dioxide produced by the plant.

• The green color is due to chlorophyll, needed to absorb sunlight

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

An incomplete diagram of the process of photosynthesis is provided.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

Chlorophyll is a chemical found in plants that contributes to which of the following regarding the process of photosynthesis?

• Release of oxygen in the atmosphere

• Movement of water throughout the plant

• Absorption of sunlight to synthesize glucose

• Uptake of sugar to be used as plant food

Tags

NGSS.MS-LS1-6

After food is consumed, chemical nutrients are absorbed into the blood. The blood then carries these nutrients to the body's cells where the nutrients enter mitochondria. Which reaction must occur next for the cell to carry on other activities?

• Glucose and water combine to produce high-energy molecules.

• Glucose and oxygen combine to produce high-energy molecules.

• Oxygen, light, and glucose combine to produce high-energy molecules.

• Oxygen, carbon dioxide, and glucose combine to produce high-energy molecules.

Tags

NGSS.MS-LS1-7

Cellular respiration occurs in the body 24 hours per day. During exercise, the rate of cellular respiration increases. Why does increased cellular respiration cause people to breathe faster?

• More water is lost from the body, and breathing hydrates the body.

• More heat is generated by the body, and breathing cools the body quickly.

• More nutrients are needed to produce more energy, and more oxygen must be removed from the body.

• More oxygen is needed to produce energy, and more carbon dioxide waste must be removed from the body

Which gas do animals add to the atmosphere when they breathe?

• nitrogen

• oxygen

• carbon dioxide

• hydrogen

Many athletes use altitude training to improve their performance. They travel to areas of high altitude where there is less oxygen in the air. The body adapts to the stress of less oxygen by becoming more efficient at transporting and using oxygen. What are athletes who train in high altitudes most likely trying to enhance?

• building of muscle tissue

• pH balance of red blood cells

• enhancement of the nervous system

• energy production in the mitochondria

Tags

NGSS.HS-LS1-7

Two objects have a certain gravitational force between them. What would happen if the mass of one of the objects suddenly increased?

• The mass of the other object would increase.

• The distance between the objects would increase.

• The gravitational force of the objects would remain constant.

• The gravitational force between the two objects would increase.

Tags

NGSS.MS-PS2-4

Which statement describes the force between a satellite and Earth if Earth had four times the mass that it has now?

• The force would be two times what it is now.

• The force would be four times what it is now.

• The force would be one-half what it is now.

• The force would be one-fourth what it is now.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-2