Secretion of androgens by testes is regulated by:
LTH
FSH
ICSH
Oxytocin
C.
ICSH
Testosterone, and dihydrotestosterone are secreted by testes collectively known as androgens. Secretion of androgens by testes is regulated by interstitial cell stimulating hormone (ICSH). It is a luteinizing hormone (LH).
LTH stands for luteotropic hormone. It is a substance, usually a peptide or steroid, produced by one tissue and conveyed by the bloodstream to another to effect physiological activity. It is produced by the pituitary gland of mammals.
Follicle-stimulating hormone or FSH is a gonadotropin, a glycoprotein polypeptide hormone. It is synthesized and secreted by the gonadotropic cells of the anterior pituitary gland, and regulates the development, growth, pubertal maturation, and reproductive processes of the body.
Oxytocin or Oxt is a peptide hormone and neuropeptide. It is produced by the para- ventricular nucleus of the hypothalamus and released by the posterior pituitary. It plays a role in social bonding, sexual reproduction, childbirth, and the period after childbirth.
The formation of gametophyte, from sporophyte, without spore formation or without meiosis is known as :
apospory
apogamy
parthenogenesis
none of these
One of the major difficulties in the biological control of insect pests is the :
practical difficulty of introducing the predator to specific areas
method is less effective as compared with the use of insecticides
predator does not always survive when transferred to a new environment
predator develops a preference to other diets and may itself become a pest
Anemophillous flowers have :
sessile stigma
small and smooth stigma
coloured flower
large and feathery stigma
Acid rain is due to increase in atmospheric concentration of :
Ozone
CO2 and CO
SO3 and CO
SO2 and nitrogen oxide
Photochemical smog formed in congested metropolitan cities mainly consists of:
Hydrocarbons, ozone and SOx
Hydrocarbons, SO2 and CO2
Smoke, peroxyacetyl nitrate and SO2
Ozone, peroxyacetyl nitrate and NOx
The production and maturation of sperm in testes is known as :
oogenesis
sporogenesis
gametogenesis
spermatogenesis
The true statement about 'green-house effect' is that it is caused by :
CO2 only
SO2 only
CO2 and SO2
CO2, CFC, CH4 and NO2 gases
