STD 11 - 14. Breathing and exchange in gases — NEET STD 11 Science — Question

True coelom is covered by

Which of the following statements are incorrect for spermatogenesis ?
(i) In testis, the immature male germ ceils spermatogonia produce sperms by spermatogenesis that begins at puberty.
(ii) Some of the spermatogonia called primary spermatocytes periodically undergo meiosis.
(iii) The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis.
(iv) Sperm released from the seminiferous tubules by the process called spermiation.
(v) Spermatogenesis starts at the age of puberty due to significant increase in the secretion of gonadotropin releasing hormone (GnRH).
(vi) Androgens stimulate the process of spermatogenesis.
(vii) FSH acts on the Sertoli cells and stimulates secretion of some factors which help in the process of spermiogenesis.

Saltatory conduction occurs in:

Corpus luteum in mammals is present in

Which one is the incorrect statement with regard to the importance of pedigree analysis?

After examining the blood groups of husband and wife, the doctor advised them not to have more than one child, the blood group of the couple are likely to be

Gynaecomastia is the symptom of

Which cells in the testis secrete testosterone

Assertion : Mast cells in the human body release excessive amounts of inflammatory chemicals, which cause allergic reactions.

Reason : Allergens in the environment on reaching human body stimulate mast cells in certain individuals.