Explain how attraction between water molecules supports xylem transport and organisms at water surfaces.
Tę umiejętność sprawdza 8 zadań wzorowanych na arkuszach IB z lat 2022–2026.
A small insect rests on a pond with its feet making slight depressions in the surface. Which molecular interaction primarily supports the surface film? A. Covalent bonds form between the water and the insect cuticle B. Hydrogen bonds attract neighbouring water…
A small water-strider rests on the surface of a still freshwater pool without breaking through it. Which property directly supports its weight? A. Surface tension B. Transparency C. High specific heat capacity D. Adhesion to mineral surfaces
Water affects both plant physiology and the habitats of organisms. (a) Outline benefits to organisms arising from cohesion of water molecules. (b) Outline how environmental conditions influence transpiration. (c) Explain osmosis and its effects on plant cells.…
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…
A small pond insect rests on the surface without breaking through it. Which property of water most directly supports this behaviour? A. Its complete inability to interact with charged substances B. Its higher density as ice than as liquid C. Its low resistance…
Water and dissolved substances connect the functioning of cells with the physical conditions of oceans. (a) Outline properties of water, linking each to its importance for living organisms. (b) Describe how water-soluble molecules and ions pass across cell…
A small insect is supported by the water surface without breaking through it. Which interaction principally creates the surface tension that supports the insect? A. Attraction of water to cellulose in plant walls B. The thermal motion responsible for…
The model contains only water molecules. Solid lines are covalent bonds; dashed lines represent attractions between molecules. Which property is not demonstrated? A. Hydrogen bonding between molecules B. Unequal distribution of charge within a molecule C.…
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