OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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What is the role of testosterone?

To regulate menstrual cycles
To stimulate sperm production
To promote breast development
To control metabolic rates

The correct answer is: To stimulate sperm production

Testosterone plays a crucial role in sexual and reproductive health, particularly in males, and one of its primary functions is to stimulate sperm production. This hormone is produced mainly in the testes and is essential for the development of male reproductive tissues, including the testes and prostate. Additionally, testosterone contributes to the production of sperm within the seminiferous tubules in the testes, facilitating male fertility. The other functions mentioned do not align with the primary action of testosterone. For instance, regulating menstrual cycles is primarily associated with hormones like estrogen and progesterone in females. Promoting breast development is also more closely related to estrogen. Controlling metabolic rates pertains to hormones like thyroid hormones, which manage metabolism rather than testosterone. Thus, the assertion that testosterone's key role is in stimulating sperm production is scientifically accurate and consistent with established biological knowledge.