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A1.1 Water

A1.2 Nucleic acids

A2.1 Origins of cells (HL)

A2.2 Cell structure

A2.3 Viruses (HL)

A3.1 Diversity of organisms

A3.2 Classification and cladistics (HL)

A4.1 Evolution and speciation

A4.2 Conservation of biodiversity

B1.1 Carbohydrates and lipids

B1.2 Proteins

B2.1 Membranes and membrane transport

B2.2 Organelles and compartmentalization

B2.3 Cell specialization

B3.1 Gas exchange

B3.2 Transport

B3.3 Muscle and motility (HL)

B4.1 Adaptation to environment

B4.2 Ecological niches

C1.1 Enzymes and metabolism

C1.2 Cell respiration

C1.3 Photosynthesis

C2.1 Chemical signalling (HL)

C2.2 Neural signalling

C3.1 Integration of body systems

C3.2 Defense against disease

C4.1 Populations and communities

C4.2 Transfer of energy and matter

D1.1 DNA replication

D1.2 Protein synthesis

D1.3 Mutations and gene editing

D2.1 Cell and nuclear division

D2.2 Gene expression (HL)

D2.3 Water potential

D3.1 Reproduction

D3.2 Inheritance

D3.3 Homeostasis

D4.1 Natural selection

D4.2 Sustainability and change

D4.3 Climate change

IB Biology Topic A1.1 Water Revision Notes (SL/HL) | RevisionDojo

IB
A1.1 Water

A1.1B Consequences of hydrogen bonding: cohesion, adhesion, solvent and thermal properties

Key Definitions

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Subtopics and learning objectives

A1.1.3 Cohesion of water molecules due to hydrogen bonding and consequences for organisms

A1.1A Water: the medium for life, polarity and hydrogen bonding

A1.1C Water beyond Earth and the search for life

Cohesion Comes from Hydrogen Bonding

Definition

Cohesion

The attraction between water molecules due to hydrogen bonding.

In water, cohesion results from hydrogen bonds between water molecules.
Each water molecule can form hydrogen bonds with neighbouring water molecules.
These bonds hold water molecules together.

Cohesion Enables Xylem Transport

Cohesion enables water transport in plants through xylem vessels.

How It Works
1. Water evaporates from leaves through stomata (transpiration).

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A1.1.3 Cohesion of water molecules due to hydrogen bonding and consequences for organisms
A1.1.4 Adhesion of water to materials that are polar or charged and impacts for organisms
A1.1.5 Solvent properties of water as a medium for metabolism and transport
A1.1.6 Physical properties of water and the consequences for animals in aquatic habitats

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