Human Reproduction - Online Test
Q1. Oogenesis starts
Answer : Option B
Explaination / Solution:
In female baby, oogenesis starts before the birth of baby after forming primary oocyte. Further development to ovum occurs after attaining puberty.
Q2. How many sperms are formed by 4 primary spermatocytes?
Answer : Option A
Explaination / Solution:
Each primary spermatocyte undergoes first meiotic division to produce 2 secondary spermatocytes, which further proceeds to second meiotic division to form 2 spermatids. So, each primary spermatocyte produces 4 sperms.
Q3. The developing sperms are nourished by
Answer : Option D
Explaination / Solution:
Seminiferous tubules contain Spermatogonia and Sertoli cells. Spermatogonium undergoes meiotic division to produce sperms and Sertoli cells provide nourishment to them.
Q4. Which of the following control the function of Sertoli cell?
Answer : Option A
Explaination / Solution:
FSH (follicle stimulating hormone) stimulates Sertoli cells to secrete spermatogenic substance. Sertoli cells function as nurse cells for differentiating spermatozoa.
Q5. Egg released by the Graafian follicle is surrounded by
Answer : Option A
Explaination / Solution:
One of the two ovary release one egg by the Graafian follicle. The egg released is surrounded by two layers called zonapellucida and Vitelline membrane as protective layer.
Q6. The number of autosomes in human primary spermatocyte is
Answer : Option A
Explaination / Solution:
Primary spermatocytes are diploid and contain 23 pairs (46) of chromosomes. These chromosomes are divided into autosomes and sex chromosome. Sex chromosomes are XY and remaining chromosomes are called autosomes.
Q7. A human female is born with a million of primary oocytes at the time of birth. How many eggs get a chance to mature?
Answer : Option B
Explaination / Solution:
Girls are born with 200-300 millions of primary oocytes but all of these oocytes do not get chance to mature and change into ovum because one ovary produce only one ovum each month in the middle of menstrual cycle. So, about 500 eggs are released by female during her reproductive life.
Q8. Five oogonia yield 10 primary oocytes, then how many ova are produced on completion of oogenesis?
Answer : Option B
Explaination / Solution:
Each oogonium produces one ovum at the end of oogenesis process and three polar bodies. Thus, five oogonia will produce five ova at the completion of oogenesis process.
Q9. Identify the false statement out of the following
Answer : Option C
Explaination / Solution:
Androgen hormone is produced from leydig cells. Sertoli cells provide nutrition to spermatozoa or sperm and menstrual cycle get stopped during pregnancy.
Q10. Assertion: Each spermatogonium is diploid and contains 46 chromosomes.
Reason: Some spermatogonia, primary spermatocytes complete the meiotic division to form four haploid cells.
Answer : Option D
Explaination / Solution:
Each spermatogonium is a diploid cell and contains 23 pairs of chromosomes. Some spermtogonia, called primary spermatocytes complete the first meiotic division to form two haploid cells. So, assertion is correct but reason is incorrect.
