Biology 3.1.3 Movement of water into and across roots

Descrição

A level Biology (3.1.3 Transport in plants) FlashCards sobre Biology 3.1.3 Movement of water into and across roots, criado por Sam Gunnell em 12-04-2019.
Sam Gunnell
FlashCards por Sam Gunnell, atualizado more than 1 year ago
Sam Gunnell
Criado por Sam Gunnell mais de 5 anos atrás
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Resumo de Recurso

Questão Responda
Explain how water enters the plant and spreads throughout the roots Water 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
Does soil have a high or low water potential? Why? High as there is a low concentration of mineral ions (solute)
What are the three pathways in which water moves across the roots? Apoplast pathway Symplast pathway Vacuolar pathway
Does the apoplast pathway pass though the: Cytoplasm, cytoplasm and vacuoles, or the cell wall? Cell wall
Does the symplast pathway pass though the: Cytoplasm, cytoplasm and vacuoles, or the cell wall? Cytoplasm
Does the vacuolar pathway pass though the: Cytoplasm, cytoplasm and vacuoles, or the cell wall? Cytoplasm and vacuoles
The cell wall must be _______ to allow for movement along the apoplast pathway Fully permeable
Is there a lot or little resistance in the apoplast pathway? Little resistance as the cellulose cell wall has a very open structure
Where does the apoplast pathway stop? At the casperian strip in the endodermis cell
What connects cells? Plasmodesmata
With the symplast pathway, water flows through the ___________ Cytoplasm
What process allows water to move along the symplast pathway? Osmosis
What is the casperian strip? A band of waterproof cells in the endodermis
What is the waxy substance that makes up the casperian strip? Suberin
What 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
How 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
Explain 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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