Sciences - Co-ordinated (9-1) - 0973 CIE

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

Akọmọ Ojú-ẹkọ

Osmosis explains support in plants, water uptake by roots, and why animal cells must be bathed in a fluid of the right concentration. It is one of the most heavily examined practical topics: percentage change in mass calculations and predicting the fate of a cell in a solution come up constantly. Get the direction of water movement right and the marks follow.

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Ayẹwo Ẹkọ

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