Worksheet: Contraception

In this worksheet, we will practice explaining how hormones are used in contraception, and evaluating the effectiveness of hormonal and non-hormonal methods of contraception.


The rhythm method involves abstaining from sexual intercourse around the days a female ovulates.

Why is this not an effective method of contraception?

  • AThe longer the period of abstaining from sex, the higher the chance of future pregnancies.
  • BA female is less likely to become pregnant around ovulation days.
  • CIt relies on the menstrual cycle being perfectly regular to ensure predictions about ovulation are accurate.
  • DIt is not possible to predict when a female will ovulate.
  • EThis statement is incorrect; the rhythm method is highly effective.


1,500 women use condoms as their only form of contraception. In a year, 32 have unexpected pregnancies. How effective are condoms? Give your answer in a percentage to the nearest whole number.

  • A10%
  • B2%
  • C98%
  • D32%


A contraception method is 95% effective. If 1,000 women use it, how many will be expected to get pregnant over the course of a year?


What is the main aim of contraception?

  • ATo prevent the transfer of STDs
  • BTo promote fertilization and pregnancy
  • CTo prevent pregnancy
  • DTo prevent sexual intercourse


Methods of contraception can be classified as hormonal or barrier based on how they prevent pregnancy. For each description, state what class of contraception is being described.

A condom worn over the penis during intercourse

  • ABarrier contraception
  • BHormonal contraception

The combined pill that is taken by a female to alter her menstrual cycle

  • ABarrier contraception
  • BHormonal contraception

A diaphragm that is placed over a female’s cervix to prevent sperm from reaching the egg

  • AHormonal contraception
  • BBarrier contraception


1,500 women take the combined contraceptive pill. 7 of them have unexpected pregnancies.

How effective is the pill? Give your answer as a percentage to one decimal place.

  • A99.5%
  • B0.5%
  • C90.5%
  • D70.0%


1,500 women use a diaphragm as their only form of contraception. This diaphragm is 94% effective at preventing pregnancies, if used perfectly. How many unexpected pregnancies may occur?


Which of the following methods of contraception also protects against the transmission of most STIs?

  • AImplants
  • BContraceptive pills
  • CWithdrawal methods
  • DCondoms
  • EInjections


The table provided shows data on the effectiveness of different contraceptives, when used correctly, as stated by the NHS (2018).

MethodMale condomIntrauterine device (IUD)Combined pillDiaphragm
Effectiveness (%)98>99>9992

Which of the following statements is correct about the data?

  • AThe effectiveness of a condom in preventing pregnancies is greater than the combined pill.
  • BThe effectiveness of an IUD in preventing pregnancies is equal to a diaphragm.
  • CThe effectiveness of a diaphragm in preventing pregnancies is less than the combined pill.
  • DThe effectiveness of a diaphragm in preventing pregnancies is greater than a condom.

According to the data, which is the least effective method of contraception?

  • AUsing an IUD
  • BUsing a condom
  • CUsing a diaphragm
  • DTaking the combined pill

What is the most likely reason the percentage of effectiveness shown in the table is not representative of real-life data?

  • AThe effectiveness of barrier contraception changes depending on the days of the female’s menstrual cycle.
  • BMost people do not use these methods 100% correctly.
  • CThe data was not obtained through accurate methods.
  • DThe effectiveness of hormonal contraception decreases around the time a female ovulates.


1,500 women use an IUD as their form of contraception. 5 have unexpected pregnancies. How effective is an IUD? Give your answer as a percentage to one decimal place.

  • A95.0%
  • B99.6%
  • C0.3%
  • D99.7%

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