Assertion (A) : Castration does not eliminate sexual behaviour completely in mammals, including humans, of both sexes.
Reason (R) : Hormones do not play role in the regulation of sexual behaviour.
Castration and Sexual Behaviour Analysis
Assertion (A) states that castration does not completely eliminate sexual behaviour in mammals, including humans. This is true. While gonadal hormones are primary drivers, sexual behaviour is influenced by various factors like neural circuits, psychological states, and established behavioural patterns, which can persist post-castration.
Hormonal Regulation of Sexual Behaviour
Reason (R) claims hormones play no role in regulating sexual behaviour. This is false. Hormones, particularly sex steroids like testosterone and estrogen, are critical for sexual development, motivation, and performance in mammals. Their influence is well-documented across numerous studies.
Conclusion
Evaluating the statements:
- Assertion (A) is factually correct.
- Reason (R) is factually incorrect.
Therefore, the correct choice is that Assertion (A) is true, but Reason (R) is false.
Important Questions from System Physiology Animal
Which one of the following synaptic vesicles (as observed under transmission electron microscope) contains catecholamines?
Blood hemostasis is the interplay of several intrinsic and extrinsic factors. Deficiency of some of the blood clotting factors and their clinical manifestations are listed below.
Factors
Manifestations
A.
V
i.
Hageman trait
B.
VII
ii.
Hypoconvertemia
C.
IX
iii.
Hemophilia B
D.
XII
iv.
Parahemophilia
Which one of the following options represents all correct matches?
Columns X and Y list the terms associated with gametogenesis and fertilisation.
Column X
Column Y
A
Primordial germ cells
i
Luteinizing hormone
B
Dictyate resting stage
ii
Posterior epiblast
C
Sodium channels
iii.
Male pronuclei
D
Protamines
iv
Block polyspermy
Which one of the following options represents all correct matches?
Nephrons are structural and functional units of the kidneys. Certain statements are made below about structure and function of a nephron.
A. P cells of the collecting duct are involved in Na+ reabsorption and vasopressin-stimulated water reabsorption.
B. P cells of the collecting duct are concerned with acid secretion and HCO3- transport.
C. I cells of the collecting duct are concerned with acid secretion and HCO3- transport.
D. The total length of the nephrons including collecting ducts ranges from 45 to 65 mm.
Which one of the following options has all correct statements?
The non-ciliated cuboidal epithelial cells in bronchioles that secrete important defense markers are called
