Xylem and Phloem Science

Cohesion is...

• Water molecules sticking together due to hydrogen bonds

• Water molecules tending to stick to other surfaces

• Water molecules tending to move up a narrow tube, due to adhesion

• The ability of water to cross a cell membrane

Adhesion is...

• Water molecules sticking together due to hydrogen bonds

• Water molecules tending to stick to other surfaces

• Water molecules tending to move up a narrow tube, due to adhesion

• The ability of water to cross a cell membrane

Negative pressure pulls on the water in the Xylem when...

• Water evaporates from the stomata, leaving space

• Water comes in through the roots

• Water moves from the Phloem into the Xylem

• You water your plants

Positive pressure pushes the water in the Xylem when...

• Water evaporates from the stomata, leaving space

• Water comes in through the roots

• Water moves from the Xylem into the Phloem

Which of the following explains how the properties of water allows it to defy gravity in plants?

• Diffusion

• Cohesion-Tension Theory

• Pressure Flow Hypothesis

• Capillary Action

Which of the following explains how the properties of water and sugar allow the Phloem to "know" where to send sugar?

• Diffusion

• Cohesion-Tension Theory

• Pressure Flow Hypothesis

• Capillary Action

Sugar moves from the Source cell, through the companion cell, and into the phloem via...

• Osmosis

• Passive Transport

• Active Transport

• Aquaporins

Tags

NGSS.MS-LS1-2

Sink cells...

• Are the cells that need sugar

• Are the cells that have lots of sugar

• Are only in the roots

• Are only in the leaves

Tags

NGSS.MS-LS1-6

Water moves to and from the Xylem and Phloem via...

• Conjugation bridges

• Aquaporins

• Osmosis

• Active Transport

Because moving sugar requires active transport, phloem cells must...

• Be alive

• Have holes in their cell walls

• Rely on osmosis

• Have extra vacuoles

Tags

NGSS.MS-LS1-2