OCR A Level Biology A
OCR A Level Biology A Excretion as an Example of Homeostatic Control Exam Questions
Free OCR A Level Biology A exam questions on Excretion as an Example of Homeostatic Control, with mark schemes. Covers the liver, the kidney, osmoregulation, kidney failure and urine testing.
Excretion as an Example of Homeostatic Control exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
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OCR A Level Biology A H420 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About OCR A Level Biology A Excretion as an Example of Homeostatic Control
This topic covers how the body removes waste and controls water balance.
What you need to know
- Liver Structure, deamination and the ornithine cycle, and detoxification.
- Kidney Nephron structure, ultrafiltration and selective reabsorption.
- Osmoregulation ADH, the hypothalamus and the collecting duct.
- Kidney failure Dialysis, transplants and urine tests such as pregnancy tests.
Common mistakes in Excretion as an Example of Homeostatic Control
- Saying ADH makes urine more dilute.
- Forgetting proteins are too large for ultrafiltration.
- Confusing the loop of Henle's two limbs.
Try three Excretion as an Example of Homeostatic Control exam-style questions
1. Explain how ADH reduces water loss. (2 marks)
Show the mark scheme answer
ADH makes collecting duct walls more permeable (1) by adding aquaporins, so more water is reabsorbed (1).
2. State where glucose is reabsorbed. (1 mark)
Show the mark scheme answer
The proximal convoluted tubule.
3. Name the waste produced by deamination. (1 mark)
Show the mark scheme answer
Ammonia, converted to urea.
Excretion as an Example of Homeostatic Control FAQs
What does this topic cover?
The liver, kidneys, osmoregulation and kidney failure.
Which practical links here?
Dissection of a kidney or examining liver histology.
How do pregnancy tests work?
Monoclonal antibodies detect hCG in urine.
Revise this topic with flashcards: OCR A Level Biology A H420 Flashcards, with mark scheme answers for Anki and Quizlet.
