IB Biology SL B4.1.2 Adaptations to Abiotic Environment Questions

Explore how aerial roots, pneumatophores and salt glands help mangroves exchange gases and manage salt in waterlogged coastal habitats in IB Biology SL B4.1.2.

Exam points

Explain how mangrove aerial roots or pneumatophores support gas exchange in waterlogged soil.
Explain how mangrove salt exclusion or salt-gland excretion maintains ion balance in saline habitats.

[Maximum number: 2]

The image shows a cast of the lower surface of a leaf from a busy Lizzie (Impatiens walleriana) plant as seen under a light microscope with a magnification of $600 \times$ .

Circular microscope field of leaf epidermis showing irregular interlocking cells, dark nuclei and several pairs of guard cells around elongated pores.

Explain one feature of tree roots that help trees to survive in mangrove swamps.

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IB Biology SL B4.1.2 Adaptations to Abiotic Environment Questions question 1