2020 7th Grade Review 3

In an experiment, a sealed bag containing starch solution is placed into a beaker containing iodine. The bag is permeable only to the iodine. Which statement correctly identifies what will occur?

• Iodine will move in and starch will move out of the bag.

• Iodine will move into the bag.

• Starch will move out of the bag

• There will be no movement of iodine nor starch.

Tags

NGSS.MS-PS1-2

When a plant cell is placed in water, the plant cell will swell and become larger. What cell process is responsible for the movement of water into a cell?

• cellular respiration

• active transport

• translation

• osmosis

In the system shown in the diagram above, water molecules are most likely to diffuse in which direction?

• from B to D

• From A to B

• from C to A

• From C to D

If a cucumber slice is placed in water, which way will the water move?

• out of the cucumber cells

• into the cucumber cells

• water will move in and out equally

• water will not move

Osmosis is a very important process that occurs in cells. Which of the following choices best describes osmosis?

• the passive transport of sugar across the cell membrane

• the active transport of sugar across the cell membrane

• the passive transport of water across the cell membrane

• the active transport of water across the cell membrane

Tags

NGSS.MS-LS2-3

What will happen to a fresh cut flower when it is placed in a salt water solution?

• The flower will stay fresh for 2 to 3 days

• The leaves will turn different colors.

• The flower will shrivel and die.

• The flower petals will swell up.

Tags

NGSS.MS-LS1-5

Which of the following describes the way substances diffuse in and out of a cell?

• Substances move from greater to lesser concentration.

• Substances move from lesser to greater concentration.

• Substances move back and forth across the membrane equally.

• Substances move across the membrane when energy is available.

When a plant cell is placed in distilled water molecules move into the cell. When a plant cell is placed in salt water, it loses water to the surrounding solution. Why does this occur?

• The water molecules are moving from and area of low concentration to an area of high concentration/

• Water molecules diffuse from areas of high concentration to areas of low concentration.

• The movement of water is associated with the temperature of water.

• The salt eats away at the cell membrane and causes it to collapse.

Osmosis is the diffusion of ____ into or out of the cell through the cell membrane.

• waste

• water

• oxygen

• food

Tags

NGSS.MS-LS2-3

Permeable means

• things can pass through
• the concentration levels are different
• it is permanent
• things are stuck