BISC 101 Lecture Notes - Lecture 10: Casparian Strip, Pericycle, Endodermis

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pinktiger219

30 Oct 2017

School

Simon Fraser University

Department

Biological Sciences

Course

BISC 101

Professor

Tony Williams

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Document Summary

H2o flows from high to low potential. Without = flaccid: outline 4 solute/pressure potentials. 1. high solute potential = water moves to side with more solute. 2. + pressure potential water moves away from pressure (phloem transport) 3. solute pressure = pressure potential no movement. Epidermis cortex endodermis pericycle xylem cells. Cylindrical layer cells forming boundary b/w cortex & vascular tissue. Narrow band h2o repellent wax secreted by endodermis cell wall. Forces h2o move cytoplasm of endodermal cells. H2o potential is high in soil/roots & low in leaves/stems. 1. h2o pushed against gravity w + pressure in roots. Root cells actively pump mineral ions xylem & casparian strips. Accumulation solute lowers h2o potential xylem. Therefore h2o moves in from cortex & generate + root pressure. Too weak to counter gravity over long distance. 2. h2o drawn up xylem cells with capillary action. H2o pulled up by force generated in leaves.

Related Questions

1,Match the descriptions to the type of transport.

- A. B. C.	Water enters a cell because it is hypertonic compared to the extracellular environment, increasing its turgor pressure
- A. B. C.	Water enters guard cells because the guard cells are hypertonic compared to the surrounding cells
- A. B. C.	Potassium ions are pumped into guard cells
- A. B. C.	The motor cells of a Venus fly trap are hypotonic compared to surrounding cells, causing water to leave the motor cells
- A. B. C.	Sugar is loaded into the phloem

A.	Both active and passive transport
B.	Passive Transport
C.	Active transport

2,Describe what is wrong with the following statement and explain why:

All prokaryotic and eukaryotic cells contain plasma membrane, nucleus, ribosomes, organelles, cytoplasm, and cell walls.

What is short-distance transport?

	a,	The movement of solutes from a region of low concentration to a region of high concentration
		b,The movement of water, nutrients, and other substances between cells
c,		The movement of substances from a region of high concentration to a region of low concentration
d,		The movement of water across a semipermeable membrane from a region of low solute concentration to a region of high solute concentration.

What terms describe the movement of water across a semipermeable membrane from a region of high water concentration towards a region of low water concentration (and high solute concentration.)

What is found in the proptoplasm?

Cell wall, cytoplasm, plasma membrane, nucleus, and other cell organelles

Plasmodesmata, cell wall, and plasma membrane

Cell wall, cytoplasm, and plasma membrane

Cytoplasm, nucleus, and other cell organelles

The channels that allow nutrients and protoplasm to pass between plant cells are called _________________.

What happens when a plant cell is placed in a hypotonic solution?

Water will enter the plant cell and the plasma membrane will swell and cell lysis will occur

Water will leave the plant cell and the plasma membrane will pull away from the cell and plasmolysis will occur

Water will enter the plant cell and the plasma membrane will swell and push against the cell wall

Water will leave the plant cell and the plant cell will lose turgor pressure, causing the plant to wilt

________________ transport uses cellular energy.

What molecules make plasma cell membranes hydrophilic on the outside and hydrophobic on the inside?

What type of cells do plants have?

		Bacterial
		Archaeic
		Eukaryotic
		Prokaryotic

BISC 101 Lecture Notes - Lecture 10: Casparian Strip, Pericycle, Endodermis

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