Medicneet Logo
NEET 2016 Phase 1 · BiologyPrevious Year Question

Changes in GnRH pulse frequency in females is controlled by circulating levels of:

Answer: (A) Estrogen and progesterone. Answer: (a) Estrogen and progesterone Solution: The hypothalamus releases GnRH, which controls the pituitary secretion of the gonadotrophins LH and FSH.

  1. A.Estrogen and progesterone✓
  2. B.Estrogen and inhibin
  3. C.Progesterone only
  4. D.Progesterone and inhibin

Correct Answer

(A) Estrogen and progesterone

Solution & Explanation

Answer: (a) Estrogen and progesterone Solution: The hypothalamus releases GnRH, which controls the pituitary secretion of the gonadotrophins LH and FSH. In females, the frequency of GnRH pulses is modulated by feedback from the circulating ovarian steroid hormones estrogen and progesterone, which are the two principal hormones secreted by the ovary. NCERT Reference: Chapter 19, Page 240, Line(s) 37–39 — "a hypothalamic hormone called Gonadotrophin releasing hormone (GnRH) stimulates the pituitary synthesis and release of gonadotrophins"

🎯
43,000+ questions in हिंदी & English · one-tap toggle
Practice NEET 2016 Phase 1 Biology — free, with instant solutions
43,000+ NEET questions solved step-by-step, chapter-wise, in the MedicNEET app.
📚Practice all NEET Biology PYQs chapter-wise →💡Don't get it? Learn the Chemical Coordination and Integration concepts →
← Biology Q17Biology Q19 →

More NEET PYQ solutions

BiolWhich one of the following is an example of ex-situ conservation?BiolWhich of the following is an example of a zygomorphic flower? (NEET 2025)BiolWhich of the following is an example of actinomorphic flower? (NEET 2024)BiolIn the seeds of cereals, the outer covering of endosperm separates the embryo by a protein-rich layer called : (NEET 2025)BiolGiven below are two statements: Statement I : In a floral formula the symbol [percentage/division-type symbol] stands for zygomorphic nature of the flower, and G with a bar above it stands for inferior ovary. Statement II : In a floral formula the symbol [same symbol] stands for actinomorphic nature of the flower and G with a bar below it stands for superior ovary. In the light of the above statements, choose the correct answer from the options given below: (NEET 2025)BiolMatch List I with List II: List I — A. Scutellum; B. Non-albuminous seed; C. Epiblast; D. Perisperm. List II — I. Persistent nucellus; II. Cotyledon of Monocot seed; III. Groundnut; IV. Rudimentary cotyledon. Choose the option with all correct matches. (NEET 2025)BiolGiven below are the stages in the life cycle of pteridophytes. Arrange the following stages in the correct sequence. A. Prothallus stage B. Meiosis in spore mother cells C. Fertilisation D. Formation of archegonia and antheridia in gametophyte. E. Transfer of antherozoids to the archegonia in presence of water. Choose the correct answer from the options given below:BiolThe correct sequence of events in the life cycle of bryophytes is A. Fusion of antherozoid with egg. B. Attachment of gametophyte to substratum. C. Reduction division, to produce haploid spores. D. Formation of sporophyte. E. Release of antherozoids into water. Choose the correct answer from the options given below:
More: All NEET 2016 Phase 1 Biology PYQs · NEET Biology PYQs · All NEET PYQs · Previous year papers