The following question refers to the generalised life cycle for land plants shown in the figure. Each number within a circle or square represents a specific plant or plant part, and each number over an arrow represents meiosis, mitosis, or fertilisation. 
- In the figure, which number represents the mature gametophyte?
Definitions:
Testing Effect
The phenomenon where the act of retrieving memory (like taking a test) enhances learning and retention more effectively than passive study methods.
Retrieval Practice Effect
An improvement in long-term memory when information is retrieved through testing rather than simply re-reading or reviewing material.
Test-Enhanced Learning
The use of tests or quizzes not only for assessment but as a tool to improve the retention and recall of information.
Full Night's Sleep
The recommended duration of sleep, typically 7-9 hours for adults, required for optimal health and functioning.
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