Multiple Choice QuestionsMost accepted theory for ascent of sap is
capillary theory
root pressure theory
pulsation theory
transpiration pull
Which of the following is not the feature of gymnosperms?
parallel venation
perennial plants
distinct branches (long and short branches)
xylem with vessels
Which of the following is/ are grouped under phanerogams?
Angiosperms
Gymnosperms
Pteridophytes
Both (a) and (b)
Which of the following theory gives the latest explanation for the closure of stomata?
ABA theory
Munch Theory
Starch glucose theory
Active K+ transport theory
The trisomy for 21st chromosome is called
Down's syndrome
Turner's syndrome
Sickle cell anaemia
Klinfelter's syndrome
Which is correctly matched?
Apiculture - Honey bee
Pisciculture - Silk moth
Sericulture - Fish
Aquaculture - Mosquito
LH and FSH are collectively called
oxytocin
samatotrophins
luteotropic
gonadotropins
D.
gonadotropins
Gonadotropins or Gonadotropic hormones are those which stimulate the gonads, ie, testes and ovaries.
FSH or Follicle Stimulating Hormone stimulates the growth of ovarian follicles and the secretion of oestrogens in the females and spermatogenesis in males.
LH or Luteinizing Hormone stimulates the corpus luteum of the ovary to secrete progesterone in the females. In males, it activates the Leydig's cells of the testis to secrete androgens.
Somatotropins or Somatotropic Hormone or Growth Hormone stimulates growth directly.
Luteotropic Hormones stimulates the corpus luteum of the ovary to secrete progesterone hormone. Also called Mammotropin Hormone (MTH) or Prolactin Hormone (PRL) as it activates growth of breast during pregnancy.
Oxytocin is secreted by posterior lobe of pituitary. It promotes contraction of the uterine muscle and myoepithelial cells of the lactating breast. Also called birth hormone and milk ejecting hormone.
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