PTE · Reorder Paragraphs

Hydration and Water Regulation

5 original Reorder Paragraphs questions. Question 1 is free to answer and check right here; log in free to practise the rest in the BandLadder app.
  • 5 questions
  • Question 1 free, no login
  • PTE Academic and PTE Core
Log in to practise all 5 →Try question 1
1

Cellular Hydration and Aquaporins

Free to try, no login

The text boxes below are in a random order. Restore the original order.

Use the arrows to move a box up or down.

  1. AThese molecular channels form extremely narrow pores that selectively facilitate rapid fluid movement whilst strictly excluding charged ions.
  2. BWithout such precise volume control, vital physiological functions would collapse as cells either swell excessively or dehydrate completely.
  3. CBy preventing this ion leakage, tissues can maintain their delicate osmotic equilibrium even under rapidly fluctuating external conditions.
  4. DLiving biological cells rely on specialised channel proteins known as aquaporins to regulate the passage of water across their lipid membranes.

Questions 2–5

The text boxes below are in a random order. Restore the original order.

Read them here; log in to answer and check them.

2

Desert Succulent Moisture Management

  1. AOne primary strategy involves developing extensive, shallow root networks that rapidly absorb fleeting surface moisture following rare desert rains.
  2. BThese combined mechanisms allow such vegetation to endure prolonged droughts lasting many consecutive months.
  3. CXerophytic plants in arid ecosystems have evolved sophisticated anatomical adaptations to secure and conserve internal moisture.
  4. DTo prevent the stored fluid from evaporating during scorching daylight hours, a dense waxy cuticle coats the outer epidermis.
  5. EOnce drawn inside the plant, this captured water is shuttled directly into thick, fleshy stems lined with specialised storage parenchyma.
3

Electrolyte Regulation in Athletes

  1. AAmong these lost minerals, sodium is the most critical for maintaining appropriate blood plasma volume and nerve conduction.
  2. BSustained physical exertion triggers profuse sweating, which depletes both body water and vital dissolved minerals.
  3. CIf an athlete replaces this lost fluid with pure water alone, blood sodium concentrations can plummet to dangerous levels.
  4. DConsequently, modern sports formulations incorporate precise ratios of sodium and carbohydrates to ensure safe and effective rehydration.
4

Avian Metabolic Water Generation

  1. AThis newly synthesised moisture offsets respiratory losses sustained during continuous, high-altitude flight.
  2. BAs a result, such avian species can remain adequately hydrated for several days of non-stop powered flapping.
  3. CLong-distance migratory birds frequently cross vast oceans and deserts without any opportunity to descend and drink.
  4. DTo survive these grueling journeys, they depend heavily on metabolic water generated internally during the oxidation of stored body fat.
  5. EEvery gram of metabolised fat yields slightly more than one gram of pure biochemical water.
5

Ancient Olla Irrigation Hydration

  1. AThis self-regulating release kept the crop root zone constantly damp whilst virtually eliminating evaporative loss.
  2. BAncient agricultural communities developed subterranean clay vessels, known as ollas, to optimise soil hydration in dry climates.
  3. CBecause the terracotta remained microporous, moisture seeped gradually into the surrounding dry soil only when moisture tension arose.
  4. DFarmers buried these unglazed pots neck-deep in the earth adjacent to crop roots and filled them with water.

Want to answer the other 4?

Log in to practise Reorder Paragraphs in the BandLadder app: the full question bank, instant scoring the way Pearson marks it, and answer explanations.

Log in to practise Reorder ParagraphsNew here? Create a free account

Ready for the whole test?

Take a full PTE mock with every question type, the real timings and a score on Pearson's 10–90 scale the moment you finish.

Try a free PTE mock →

Keep practising

More Reorder Paragraphs sets

Practise every PTE question type

  • ✓Full question bank for every type
  • ✓Instant scoring, marked the way Pearson does
  • ✓BandLadder AI scoring for speaking and writing
Practise in the app

Free account · no card

© 2026 BandLadder. Written and checked by the BandLadder team. You may quote or cite this page with credit to BandLadder and a link to it; republishing it in full needs our written permission. Content use policy

Log in to practise all 5