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Maintaining Water And Nitrogen Balance In The Body (biology Only) (GCSE Biology)

The following is a GCSE Biology test covering 'Maintaining Water And Nitrogen Balance In The Body (biology Only)' from the broader topic Homeostasis And Response. The test is geared towards the AQA exam board style syllabus.
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Which structure in the kidney is the basic functional unit that filters blood to form urine?
Why might a person with kidney failure have high blood urea levels and swelling (oedema)?
Which agricultural practice increases soil nitrate levels by adding reactive nitrogen and can contribute to water pollution?
In the context of osmoregulation, what does “hypotonic” mean for the fluid surrounding a cell?
Which best describes how aquaporins in kidney collecting duct cells are regulated to control water reabsorption?
Which type of animal excretes uric acid primarily and why is this advantageous?
What is the main advantage of urea as an excretory product compared with ammonia?
Which change to the collecting duct increases water reabsorption into the blood?
Which nitrogen-containing waste is produced by many aquatic animals and is highly toxic, so must be diluted or rapidly excreted?
Which statement about osmoregulation in the kidney during dehydration is correct?
Which cell type in the nephron senses blood osmolarity and triggers ADH release via the brain?