CELPIP Reading Part 3Reading for Information Practice

A. Mangroves occupy tropical and subtropical shorelines where ocean tides repeatedly flood soils containing very little oxygen. Fresh water is limited in this setting even when the ground appears completely saturated around the trees. High salt levels would draw moisture from ordinary plant tissues, so mangroves require several ways to control salt and water. Different mangrove species solve these problems differently, which helps explain their varied forms along the same coast. Together, these details place salt management and survival adaptations of mangrove trees within a broader pattern shaped by the surrounding environment over a meaningful period of time.

B. Special membranes in many mangrove roots exclude a large share of dissolved salt while water enters the plant. This filtering is incomplete, and the tree must manage the smaller amount of salt that passes through its roots. Upright or arching roots expose tiny pores to the air, allowing buried tissues to receive oxygen above the waterlogged mud. Loose sediment can block these pores, so an abrupt change in water flow may interfere with the root system. This combination helps explain why root structures that filter salt and obtain oxygen cannot be understood from one feature alone or from one brief observation.

C. Some mangroves move absorbed salt into older leaves and later shed those leaves from the tree. Other species release salt through glands, leaving visible crystals that rain can eventually wash away. Thick, waxy leaves and carefully regulated pores limit water loss during hot periods between tides. Leaves may also change their angle toward strong sunlight, reducing the heat received by their broad surfaces. For salt management and survival adaptations of mangrove trees, relationships among these features matter because a change in one may influence several others within the same setting over time.

D. Dense mangrove roots slow moving water and trap sediment, which can reduce erosion along sheltered shorelines. The submerged root network also creates protected feeding areas for juvenile fish and other small animals. Restoration succeeds only when planners match species with suitable tidal depth, drainage, and wave exposure rather than planting trees anywhere. Seedlings still face damage from storms and floating debris, so young sites usually need monitoring until roots become established. Viewed together, details about shoreline benefits and requirements for successful restoration connect visible characteristics with processes that are less immediately obvious to an ordinary observer at first.

E. Not given in any of the above paragraphs.