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      Why do we have a separation of powers?

      Lesson details

      Learning outcome

      I can describe the different branches of government and analyse why they might have a separation of powers.

      Key learning points

      1. Power in the UK is split into three branches; the legislative, the executive and the judiciary.
      2. Separation of powers exist to ensure checks and balances, accountability, protection of rights and scrutiny.
      3. Power is shared to prevent corruption, allowing each branch to oversee and check the actions of the others.

      Keywords

      • Legislative - the lawmaking body of the state i.e. Parliament in the UK

      • Executive - the branch of government that is responsible for putting laws or decisions into effect

      • Judiciary - the branch of the state that is responsible for enforcing the law; it is composed of judges and other legal officials

      Common misconception

      Power is separated, therefore, each branch does not link together.

      While power is separated, the branches are still linked and work together. Each branch has its own responsibilities but also checks and balances the others to ensure no one branch becomes too powerful.

      Teacher tip

      Ensure pupils understand the key terms (executive, legislative and judiciary) before exploring how they overlap. A solid grasp of each branch's role will help pupils better understand how they work together in checks and balances.

      Licence

      This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0
      except where otherwise stated. See Oak's terms & conditions
      (Collection 2).

      Lesson video

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      Prior knowledge starter quiz

      6 Questions

      Q1.
      UK Parliament is made up of the Monarch, the House of Commons and the House of ...

      Correct Answer: Lords

      Q2.
      In which area of UK Parliament do MPs meet?

      Correct answer: House of Commons
      House of Lords
      monarchy

      Q3.
      Who is the head of the Government?

      Monarch
      Lords
      Correct answer: Prime Minister

      Q4.
      What is the British Constitution?

      Correct answer: set of principles and rules by which the country is organised
      set of principles and rules decided by the monarch for running the Government
      set of principles and rules only for some citizens

      Q5.
      The House of Lords is an chamber.

      Correct Answer: appointed

      Q6.
      Match the type of constitution to its definition.

      Correct Answer:codified constitution ,rules by which a country is governed in a single document

      rules by which a country is governed in a single document

      Correct Answer:uncodified constitution,rules by which a country is governed not in a single document

      rules by which a country is governed not in a single document

      6 Questions

      Q1.
      The three branches of power in the UK are the executive, the judiciary and the ...

      Correct Answer: legislative

      Q2.
      Which branch is responsible for running the country and developing and implementing policies?

      Correct answer: executive
      judiciary
      legislative

      Q3.
      Which of the following is a reason why power is separate in the British constitution?

      to prevent citizens having any power
      to give the power to the monarchy instead of Parliament
      Correct answer: to ensure no single branch becomes too powerful

      Q4.
      Match the correct branch to who holds them accountable.

      Correct Answer:executive,are held accountable by the legislative who scrutinise their actions

      are held accountable by the legislative who scrutinise their actions

      Correct Answer:judiciary,are held accountable by the media through press coverage on rulings

      are held accountable by the media through press coverage on rulings

      Correct Answer:legislative,are held accountable by the judiciary who apply the laws impartially

      are held accountable by the judiciary who apply the laws impartially

      Q5.
      Which branch scrutinises the work of others by conducting reviews in court to decide if legislation violates the constitution?

      executive
      Correct answer: judiciary
      legislative

      Q6.
      Which of the following statements is an accurate description of the separation of powers in the UK?

      Power is separated, therefore, each branch does not link together.
      Correct answer: While power is separated, the branches are still linked and work together.
      Power is not separated, each branch has the same responsibilities.

      To help you plan your 11 citizenship lesson on: Why do we have a separation of powers?, download all teaching resources for free and adapt to suit your pupils' needs...