31.

GnRH, a hypothalamic hormone, needed in reproduction, acts on

• Anterior pituitary gland and stimulates secretion of LH and oxytocin

• Anterior pituitary gland and stimulates secretion of LH and FSH

• Posterior pituitary gland and stimulates secretion of oxytocin and FSH

• Posterior pituitary gland and stimulates secretion of oxytocin and FSH

In Bougainvillea thorns are the modifications of

• Stipules

• Adventitious root

• Stem

• Stem

Good vision depends on adequate intake of carotene rich food
Select the best option from the following statements
(a) Vitamin A derivatives are formed from carotene
(b)The photopigments are embedded in the membrane discs of the inner segment
(c) Retinal is a derivative of vitamin A
(d) Retinal is a light absorbing part of all the visual photopigments

• (a) & (b)

• (a), (c) & (d)

• (a) & (c)

• (a) & (c)

A decrease in blood pressure/volume will not cause the release of

• Renin

• Atrial Natriuretic Factor

• Aldosterone

• Aldosterone

The vascular cambium normally gives rise to

• Phelloderm

• Primary phloem

• Secondary xylem

• Secondary xylem

Which of the following statements is correct?

• The ascending limb of loop of Henle is impermeable to water

• The descending limb of loop of Henle is impermeable to water

• The ascending limb of loop of Henle is permeable to water

Fruit and leaf drop at early stages can be prevented by the application of

• Cytokinins

• Ethylene

• Auxins

• Auxins

A baby boy aged two years is admitted to play school and passes through a dental check-up. The dentist observed that the boy had twenty teeth.
Which teeth were absent?

• Incisors

• Canines

• Pre-molars

• Pre-molars

An important characteristic that Hemichordates share with Chordates is

• Absence of notochord

• Ventral tubular nerve cord

• Pharynx with gill slits

• Pharynx with gill slits

Select the correct route for the passage of sperms in male frogs :

• Testes - Bidder's canal - Kidney - Vasa
  efferentia - Urinogenital duct - Cloaca

• Testes - Vasa efferentia - Kidney - Seminal
  Vesicle - Urinogenital duct - Cloaca

• Testes - Vasa efferentia - Bidder's canal -
  Ureter - Cloaca

• Testes - Vasa efferentia - Bidder's canal -
  Ureter - Cloaca