Cambridge Secondary (7-9). Stage 9. MCE Science. Workbook - Unit 3: Variation and Inheritance - Question 65

Study the diagrams and complete the dichotomous key to determine the stages in the process of fertilisation.

Stages of fertilisation → Is the egg cell surrounded by many sperm cells? → Yes / No. Continue each branch.

Use your key to identify the correct stage for each diagram and write its number in the blank.