CELPIP Reading Part 3 Practice Test: The Changing Coat Of The Arctic

Paragraph A

The familiar white winter coat is only one Arctic fox form; in the white colour morph, short summer fur is brown or grey above and lighter below, while the autumn moult produces a mostly white coat. The blue morph remains dark charcoal, brown, or bluish through winter and is common in some coastal populations. Day length is a major seasonal cue: changing light affects hormones that initiate moulting before local snow necessarily arrives or disappears. Temperature can influence the pace and condition of coat growth, but a warm week does not simply switch colour. Genes determine the morph, while seasonal physiology changes the coat within that inherited pattern. This framing connects the immediate facts without erasing the distinctions among them.

Paragraph B

Winter warmth comes primarily from the coat's structure, not from white pigment. Dense underfur traps still air near the skin, and longer guard hairs reduce wind penetration and shed snow. Fur even covers the foot pads, adding insulation where the animal contacts ice. An Arctic fox can raise its hairs to deepen the insulating layer, or compress the coat and increase blood flow near the surface when releasing heat. Curling into a ball further reduces exposed area, with the tail covering the face and feet. These responses work with body fat and circulation, so coat colour alone is a poor measure of protection from cold. Viewed together, the evidence connects immediate observations with the broader pattern they collectively produce.

Paragraph C

Colour can reduce visual contrast, but camouflage depends on the background and the observer. A white fox may be difficult to see on continuous snow yet conspicuous on dark rock after an early thaw. Because the moult follows photoperiod more reliably than short-term weather, unusually late snow or early melting can create a seasonal mismatch. Foxes may partly compensate by choosing snowy patches, shadows, or sheltered terrain, but those options depend on the landscape. Researchers measure mismatch by comparing coat colour with snow cover over time; sighting fewer foxes is insufficient because movement, food supply, and observer effort also alter detection. Taken together, the separate details reveal a broader pattern while preserving the different limitations attached to each individual observation.

Paragraph D

Climate affects Arctic foxes through more than coat mismatch. Shrinking sea ice can reduce access to marine food, while changing snow conditions alter the availability of lemmings beneath the surface. Warmer northern environments also allow red foxes to expand into some areas, where their larger size can give them an advantage in competition and den occupation. Outcomes vary: coastal Arctic foxes may use seabird colonies, whereas inland populations can rise and fall with rodent cycles; conservation monitoring therefore combines den occupancy, diet, reproduction, competitor presence, and weather records. A single winter count cannot separate a coat-related problem from changes in prey or competition. Viewed as a whole, the details explain the pattern while preserving the limits attached to individual observations.

Paragraph E

Not given in any of the above paragraphs.