The diploid cells in the testes that undergo meiosis i to produce haploid cells are the
a. secondary spermatocytes
b. primary spermatocytes
c. interstitial cells
d. spermatogonia
e. sertoli cells

b. Primary spermatocytes

Explanation:

Primary spermatocytes are the diploid cells present in seminiferous tubules of testes. These diploid cells enter meiosis I and produce haploid cells. Each diploid primary spermatocyte produces two haploid cells by meiosis I which are called secondary spermatocytes.  

The secondary spermatocytes then enter meiosis II to produce sperms.  

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