Zadanie 3b
A freshwater ciliate has contractile vacuoles. Outline why these structures are important.
Osmotic effects on cells without walls
Explain swelling, lysis and shrinkage and relate water balance to contractile vacuoles and controlled tissue-fluid conditions.
Tę umiejętność sprawdza 15 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 15 Otwórz w wyszukiwarce z filtrami
Zadanie 4c
Explain what could happen if a freshwater single-celled organism without a cell wall were exposed to these solutions.
- Materiał graficzny
Zadanie 2b
(i) Distinguish the volume changes in the mRNA-treated cells from those in the controls. (ii) Explain how the introduced aquaporins produce this difference.
- Materiał graficzny
Zadanie 12
A schematic records the shapes of mammalian red blood cells after immersion in a test solution. What can be deduced from their appearance? A. The external solution has a lower solute concentration and the cells have swollen B. The external solution is…
- Materiał graficzny
Zadanie 7
Water properties affect both individual cells and whole plants. (a) Draw and label two interacting water molecules. (b) Outline what happens when animal and plant cells are immersed in pure water. (c) Explain transpiration and the adaptations of xylem vessels…
Zadanie 12
Identical red blood cells were placed in solutions P–S. Which conclusion is supported by their model appearances? A. Q is more dilute than P B. S has a higher effective solute concentration than Q C. R is more concentrated than S D. P is more dilute than S
- Materiał graficzny
Zadanie 1b
An animal epithelial cell is transferred to a hypertonic salt solution. Describe what would happen to it.
Zadanie 17
An intestinal infection causes severe diarrhoea. Suggest how this condition could become fatal.
Zadanie 1
In a freshwater unicellular organism, the contractile vacuole repeatedly collects and expels excess water. Which life function is most directly served? A. Maintaining a stable internal environment B. Producing daughter cells C. Obtaining organic food by…
Zadanie 2
A technician mixes a small sample of mammalian blood with pure water. Intact red cells subsequently disappear from view. Suggest why the red cells disappear.
Zadanie 1c
A model dataset relates the osmolarity of fluid surrounding mammalian sperm to the fraction of moving sperm. Explain one change expected if these sperm are transferred to a hypotonic solution.
- Materiał graficzny
Zadanie 2
A researcher maintains living animal cells in an aqueous medium during microscopy. Explain why the medium should have the same osmolarity as the cells.
Zadanie 1a
A sample of plant epidermal cells is placed in a hypertonic salt solution. Explain the effect on the cells.
Zadanie 2
A freshwater protist is placed in distilled water. Short arrows show water movement and longer horizontal arrows show the sequence of stages. Which life function is illustrated by this cycle? A. Protein digestion B. Reproduction C. Homeostatic regulation D.…
- Materiał graficzny
Zadanie 3
A freshwater protist is placed in distilled water. Short arrows show water movement and longer horizontal arrows show the sequence of stages. The protist is moved to a solution that is still hypotonic to its cytoplasm but less dilute than distilled water. What…
- Materiał graficzny