Flashcards
Biology 3.1.3 Movement of water into and across roots
Cards in this deck (17)
- 1Explain how water enters the plant and spreads throughout the rootsWater enters the roots via osmosis as the soil has a higher water potential. As water moves into the root hair cells, the cell becomes turgid and water moves to cells with less water potential via osmosis again
- 2Does soil have a high or low water potential? Why?High as there is a low concentration of mineral ions (solute)
- 3What are the three pathways in which water moves across the roots?Apoplast pathway
Symplast pathway
Vacuolar pathway - 4Does the apoplast pathway pass though the: Cytoplasm, cytoplasm and vacuoles, or the cell wall?Cell wall
- 5Does the symplast pathway pass though the: Cytoplasm, cytoplasm and vacuoles, or the cell wall?Cytoplasm
- 6Does the vacuolar pathway pass though the: Cytoplasm, cytoplasm and vacuoles, or the cell wall?Cytoplasm and vacuoles
- 7The cell wall must be _______ to allow for movement along the apoplast pathwayFully permeable
- 8Is there a lot or little resistance in the apoplast pathway?Little resistance as the cellulose cell wall has a very open structure
- 9Where does the apoplast pathway stop?At the casperian strip in the endodermis cell
- 10What connects cells?Plasmodesmata
- 11With the symplast pathway, water flows through the ___________Cytoplasm
- 12What process allows water to move along the symplast pathway?Osmosis
- 13What is the casperian strip?A band of waterproof cells in the endodermis
- 14What is the waxy substance that makes up the casperian strip?Suberin
- 15What is the function of the casperian strip?To stop water flowing through the apoplast pathway at the endodermis so that the water can move into the xylem
- 16How and why does water move into the xylem?Mineral ions move into the xylem via active transport (through transport proteins). As a result, the water potential inside the cytoplasm increases and water potential inside the xylem decreases, causing water to move into the xylem
- 17Explain how sucrose is loaded into the phloem and how this forces movement of substances down the phloem? (**)Sucrose is actively loaded from the companion cell to the sieve tube via active transport along with H+ ions through co-transporter proteins. This reduces the water potential inside the sieve tube, resulting in water moving from the xylem and companion cell to enter the sieve tube, increasing the pressure and forcing sap down the plant and through pores in the sieve plate
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- User has deleted their subject information Flashcards on Biology 3.1.3 Movement of water into and across roots, created by Deleted user on 22/04/2019.
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- Created by Sam Gunnell · Apr 12, 2019
- Copied by Sam Gunnell · Apr 22, 2019
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