Zadanie 7, Paper 2, listopad 2025, TZ3, Biologia IB SL
Wzorowane na: Biology SL Paper 2, November 2025, TZ3, pytanie 7. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Zadanie
Polecenie
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 for carrying water from roots to leaves.
One additional mark is available for clear, concise construction of the complete response.
Korepetytor AI
Nie wiesz, jak ruszyć? Korepetytor zna to zadanie i poprowadzi Cię krok po kroku, bez gotowca.
3 rozmowy · bez karty · Zaloguj się
Sprawdź się
Odpowiedz i oceń, jak poszło. Klucz odsłoń dopiero, gdy masz swoją odpowiedź.
Jak poszło Ci z tym zadaniem?
Wybierz ocenę: zapamięta ją ta przeglądarka, a z darmowym kontem zobaczysz ją na każdym urządzeniu.
Pokaż rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
(a) Maximum4:
At least two H–O–H molecules are shown with single covalent bonds. ✔
Each molecule has a bent shape. ✔
A dotted or dashed connection joins an oxygen on one molecule to a hydrogen on the other. ✔
That intermolecular connection is labelled hydrogen bond. ✔
Partial negative charge is indicated on oxygen and partial positive charge on hydrogen. ✔
(b) Maximum4:
Pure water is hypotonic or more dilute than the cell contents. ✔
Water enters by osmosis. ✔
It crosses the cell membrane or aquaporins. ✔
Animal cells swell or may lyse. ✔
Plant cells swell or become turgid. ✔
The plant cell wall resists pressure and prevents bursting. ✔
(c) Maximum7:
Transpiration is water loss from leaves, mainly through stomata. ✔
Evaporation from moist leaf-cell walls draws replacement water from nearby cells. ✔
Water is drawn from the xylem, creating transpiration pull. ✔
Tension pulls water upwards through xylem. ✔
Cohesion results from hydrogen bonding between water molecules. ✔
Cohesion maintains a continuous water column. ✔
Adhesion is attraction between water and other polar surfaces. ✔
Adhesion supports capillary movement in soil or plant walls. ✔
Xylem vessels lack cell contents, permitting unobstructed flow. ✔
Lignified walls resist collapse under tension. ✔
Absent or perforated end walls allow continuous flow. ✔
Pits permit lateral entry and exit of water. ✔
Construction:1 mark for clear, concise communication across the response.
Schemat punktowania
Individual content caps:4,4,7. Maximum15 content marks plus1 independent construction mark, total16. Part(c):max5 for transpiration/cohesion/adhesion (first8points), max3 for vessel adaptations (last4), overall7. In(b), cell-type-specific effects must identify the type. Contractile vacuoles belong to certain protists, not ordinary animal cells, so are not credited as a general animal-cell adaptation. In (a), accept clear verbal descriptions of partial negative oxygen and partial positive hydrogen instead of charge symbols.
Umiejętności w zadaniu
- Water adhesion and capillarityĆwicz podobne
- Water loss during leaf gas exchangeĆwicz podobne
- Water cohesion in organismsĆwicz podobne
- Water polarity and intermolecular attractionĆwicz podobne
- Xylem vessels suited to water transportĆwicz podobne
- Osmotic effects on cells without wallsĆwicz podobne
- Turgor and plasmolysis in walled cellsĆwicz podobne
- Cohesion and tension in the transpiration streamĆwicz podobne