Osmosis
Muhtasari
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.
Malengo
- 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
Maelezo ya Somo
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Tathmini ya Somo
Hongera kwa kukamilisha somo la Osmosis. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- 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
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Osmosis? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
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