Class XI

Secretion of aldosterone is stimulated by : i. decrease in sodium ion concentration in the plasma. ii. decrease in potassium ion concentration in the plasma. iii. decrease in the volume of blood.
  1. only i) and iii) are correct.
  2. only i) and ii) are correct.
  3. all are correct.
  4. only ii) and iii) are correct.
A chemical acts slowly, requiring hours to take effect. It may pass in and out of many cells in which they have no effect. When they find appropriate receptor in their target cell they bind to it. Chemical is :
  1. oxytocin
  2. somatotropin
  3. aldosterone
  4. adrenaline
To exert their effect on the target cell, water soluble hormones will need to bind with
  1. cytosolic receptors.
  2. nuclear receptors.
  3. plasma proteins.
  4. cell membrane bound receptors.
Which of the following is not matched correctly :
  1. Thyroid and Parathyroid →→ derived from ectoderm
  2. Adrenal medulla →→ derived from ectoderm
  3. Adrenal cortex →→ derived from ectoderm
  4. Gonads →→ derived from mesoderm
Oral contraceptive pills contain estrogen and progesterone, that prevent
  1. all the above.
  2. release of secondary oocyte from ovary.
  3. formation of new ovarian follicles.
  4. implantation of fertilized egg in the uterus.
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