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gcse science B4 - B

specific for ocr gateway additonal science B.

QuestionAnswer
what is osmosis? diffusion of water across a partially permeable membrane from an area of high water concentration to an area of low water concentration
why can't sugar be transported by osmosis? the membrane is partially permeable, meaning no large molecules can fit through
what conditions will have to apply for water to diffuse into the plant? high concentration of water outside of the cell low concentration of water inside the cell
what coniditions will have to apply for water to diffuse out of the plant? low concentration of water outside of the cell high concentration of water inside the cell
what does flaccid mean? soft and floppy
when does a cell become flaccid? when there's a higher concentrations of water inside the cell
what happens when water enters a plant? cell swells upt increase in water pressure against the cell wall
what is turgor pressure? water pressure against the cell wall
what does turgor pressure cause? the cell to become turgid
what does turgid mean? hard and rigid
what happens when water leaves a plant? cell contents shrink less water pressure against the cell wall
what does less water pressure against the cell wall cause? cell contents are plasmolysed cell collapses
how do plants reduce their water loss? having few stomata plants can open and close their stomata
which cell controls whether the stomata opens or closes? guard cells
how does a stomata open? 1.water enters from other cells 2. chloroplasts make sugar 3. guard cells become turgid 4. stoma opens
what happens when a blood cell of an animal gains lots of water? bursts (lysis)
what happens when a blood cell of an animal loses lots of water? shrinks (crenate)
why does a blood cell of an animal either burst or shrink? it has no cell wall for support
how are root hairs adapted to absorb lots of water from the soil? long and thin large surface area
what is the evaporation of water from leaves called? transpiration
why is transpiration useful? -cools the plant -brings water to the leaves for photosynthesis -cell full of water gives support -water moving up the stem carries useful dissolved minerals
how does the leaf prevent too much water from evaporating? -has a waxy covering called the cuticle - stomata mainly on its shaded underside
what helps to support a plant? inelastic cell walls
Created by: jirwin