Human Reproduction — Important Questions
ICSE · Class 12 · Biology
104 important questions from Human Reproduction for ICSE Class 12 Biology, with answers. Includes multiple choice and true false questions.
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Important Questions from Human Reproduction
What is the primary energy source for sperm motility in human semen?
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B
Fructose, secreted by the seminal vesicles, is the primary energy source for sperm motility. Sperm have no significant glycogen reserves of their own. Therefore, the correct answer is option (2) Fructose.
Which hormone triggers ovulation in the menstrual cycle?
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C
The LH (luteinising hormone) surge on day 14 of the menstrual cycle triggers ovulation — rupture of the Graafian follicle and release of the secondary oocyte. Therefore, the correct answer is option (3) LH surge.
What structure is formed from the ruptured Graafian follicle after ovulation?
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C
After ovulation, the ruptured Graafian follicle is transformed into the corpus luteum (yellow body) under LH stimulation. The corpus luteum secretes progesterone to maintain the endometrium. Therefore, the correct answer is option (3) Corpus luteum.
How many spermatozoa are produced from one primary spermatocyte through meiosis?
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C
One primary spermatocyte undergoes Meiosis I → 2 secondary spermatocytes → Meiosis II → 4 spermatids → spermiogenesis → 4 spermatozoa. All 4 are functional. Therefore, the correct answer is option (3) 4.
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