Osmosis
Gbogbo ọrọ náà
Leave a limp stick of celery in water and it turns crisp again; soak a potato chip in salty water and it goes floppy. Both are caused by osmosis, the movement of water across a partially permeable membrane. It is how plants stand upright, how roots drink, and how every cell keeps its water balance.
In this lesson you will learn the role of water in organisms, what osmosis is, how to investigate it, and how solutions of different strengths change plant and animal cells. At Extended level you will use water potential and the terms turgid, flaccid and plasmolysis to explain what you see.
Ebumnobi
- Describe the role of water as a solvent in organisms with reference to digestion, excretion and transport
- State that water diffuses through partially permeable membranes by osmosis
- State that water moves into and out of cells by osmosis through the cell membrane
- Investigate osmosis using materials such as dialysis tubing
- Investigate and describe the effects on plant tissues of immersing them in solutions of different concentrations
- State that plants are supported by the pressure of water inside the cells pressing outwards on the cell wall
- [Supplement] Describe osmosis as the net movement of water molecules from a region of higher water potential (dilute solution) to a region of lower water potential (concentrated solution), through a partially permeable membrane
- [Supplement] Explain the effects on plant cells of immersing them in solutions of different concentrations by using the terms: turgid, turgor pressure, plasmolysis, flaccid
- [Supplement] Explain the importance of water potential and osmosis in the uptake and loss of water by organisms
Nkuzi Olu
Gee ntị na nkuzi a na ngwa
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
Mepee maapụ uche na ngwa
Kaadị ncheta
Omume ncheta ngwa ngwa n'ihe a na-anwale n'isiokwu a.
Mee omume kaadị ndị a na ngwa
Akwụkwọ Ọmụmụ
Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge
Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Osmosis. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- Osmosis is the movement of: A. any particles down a gradient B. water across a partially permeable membrane C. ions using energy D. sugar into a cell Answer: B
- Water moves by osmosis from a region of: A. low to high water potential B. high to low water potential C. equal water potential D. low to low water potential Answer: B
- A potato cylinder has initial mass 4.0 g and final mass 3.6 g. The percentage change is: A. +10% B. -10% C. -4% D. +4% Answer: B
- A plant cell that has taken in water and is firm is described as: A. flaccid B. plasmolysed C. turgid D. lysed Answer: C
- A red blood cell placed in pure water will: A. become turgid B. shrink C. burst D. stay the same Answer: C
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Mụtakwuo ihe site na isi mmalite mepere emepe
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Akụkụ akwụkwọ
Passive Transport
Explain why and how passive transport occurs
"Biology: Passive Transport" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/5-2-passive-transport. Access for free at https://openstax.org/books/biology/pages/1-introduction
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Akụkụ akwụkwọ
Transport of Water and Solutes in Plants
Define water potential and explain how it is influenced by solutes, pressure, gravity, and the matric potential
"Biology: Transport of Water and Solutes in Plants" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/30-5-transport-of-water-and-solutes-in-plants. Access for free at https://openstax.org/books/biology/pages/1-introduction
Ndị otu ndị ọzọ bipụtara ha n'okpuru ikike mepere emepe, anyị na-ekele ha dị ka ha si chọọ. Njikọ na-emepe saịtị ha.
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Osmosis? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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Ihe nile ichoro iji nwee ihe ịga nke ọma na JAMB, WAEC & NECO.
