Chemical Coordination and Integration — Page 4 | NEET Biology

Q31

MSH of pars intermedia of middle pituitary is responsible for

A darkening of skin in lower vertebrates

B light colouration of skin in lower vertebrates

C both A and B

D darkening of skin in human beings

Correct Answer

Option A

Solution

(a) MSH causes wider distribution of melanin granules in chromatophores, darkening the skin in lower vertebrates.

Q32

Addition of a trace of thyroxine or iodine in water containing tadpoles will

A keep them in larval stage

B hasten their metamorphosis

C slow down their metamorphosis

D kill the tadpoles

Correct Answer

Option B

Solution

(b) Thyroxine hormone controls metamorphosis in frog's tadpole. Adding thyroxine increases the rate of metamorphosis.

Q33

ADH or vasopressin promotes reabsorption of water from glomerular filtrate

A enzyme that hydrolyses peptides

B hormone secreted by pituitary that promotes reabsorption of water from glomerular filtrate

C hormone that promotes glycogenolysis

D energy rich compound connected with muscle contraction.

Correct Answer

Option B

Solution

(b) ADH (vasopressin) is secreted by neurohypophysis of pituitary. It increases the reabsorption of water from urine.

Q34

Occurrence of Leydig's cells and their secretion is

A ovary and estrogen

B liver and cholesterol

C pancreas and glucagon

D testes and testosterone

Correct Answer

Option D

Solution

(d) Leydig's cells are present in testes and they secrete testosterone.

Q35

Male hormone is produced in the testis by cells of

A sertoli

B epithelial

C spermatocytes

D leydig

Correct Answer

Option D

Solution

(d) Male hormones are secreted by the Interstitial or Leydig's cells in the stroma of connective tissue in testis.

Q36

Testosterone is produced by

A sertoli cells

B leydig's cells

C oxyntic cells

D pituitary gland

Correct Answer

Option B

Solution

(b) Testosterone is produced by Leydig's cells.

Q37

Function of enterogastrone is

A regulation of bile flow

B stimulation of pancreatic flow

C inhibition of gastric secretion

D stimulation of gastric secretion

Correct Answer

Option C

Solution

(c) Enterogastrone is a hormone released by the upper intestinal mucosa that inhibits gastric motility and secretion.

Q38

Ovulation is stimulated by

A LH

B FSH

C estrogen

D progesterone

Correct Answer

Option A

Solution

(a) LH induces ovulation and secretion of female sex hormone estrogen from mature ovarian follicle.

Q39

GnRH, a hypothalamic hormone, acts on:

A anterior pituitary gland and stimulates secretion of LH and FSH.

B posterior pituitary gland and stimulates secretion of oxytocin and FSH.

C posterior pituitary gland and stimulates secretion of LH and relaxin.

D anterior pituitary gland and stimulates secretion of LH and oxytocin.

Correct Answer

Option A

Solution

(a) GnRH is secreted by hypothalamus and stimulates anterior pituitary for secretion of gonadotropins (FSH and LH).

Q40

Which of the following endocrine gland stores its secretion in the extracellular space before discharging it into the blood?

A Pancreas

B Adrenal

C Testis

D Thyroid

Correct Answer

Option D

Solution

(d) The thyroid gland stores its hormone thyroglobulin in its follicles (extracellular space) before releasing it into blood.