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31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3


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25 Questions MCQ Test Biology 31 Years NEET Chapterwise Solved Papers | 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3

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31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 1

MSH of pars intermedia or middle pituitary is responsible for

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 2

Which hormone possesses anti-insulin effect?[1988]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 2

Insulin decreases the level of glucose in the blood while cortisol (secreted by middle region of adrenal cortex) increases the blood-glucose level by converting proteins and fats into carbohydrates which are, in turn, converted to glucose.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 3

Addition of a trace of thyroxine or iodine in water containing tadpoles will [1990]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 3

In 1912, Gudernatsch discovered that metamorphosis in frog’s tadpole is controlled by the thyroxine hormone which has the iodine as the main constituent. If thyroxin or iodine is added in water having tadpoles in it, then it increases the rate of metamorphosis in tadpole.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 4

Insulin is [1990]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 4

Insulin is a hormone secreted by the b-cells of pancreas and it controls the sugar level in blood

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 5

Occurrence of Leydig cells and their secretion is [1991]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 5

Leydig’s cells are present in testes and they secrete male hormone testesterone.
Small groups of polygonal, large cells present in the connective tissue in between the seminiferous tubules are known as Leydig’s cells are interstitial cells. They secret male sex hormone testosterone

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 6

ADH or vasopressin is [1991]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 6

ADH : Antidiuretic hormone – vasopressin in secreted  by neurohypophysis (posterior lobe) of pituitary gland. This hormone increases the reabsorption of water from the urine and hence urine gets concentrated and ECF gets diluted. Diabetes insipidus caused by the hyposecretion of ADH.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 7

Gastric secretion is stopped by hormone [1993]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 7

Enterogastrone secreted by the mucosa of duodenum slows gastric contractions and stops the secretion of gastric juice.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 8

Testosterone is produced by [1993]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 8

Leydig’s cells.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 9

Male hormone is produced in the testis by cells of [1993]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 9

Male hormones are secreted by the Interstitial or Leydig’s cells present in the stroma of connective tissue in between the seminiferous tubules in testis. They produce androgens (mainly testosterone) Sertoli cells are elongated epithelial cells present inside the seminal vesicle to nourish the growing spermatozoa.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 10

Ovulation is stimulated by [1994]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 10

Luteinizing Hormone (LH) induces the Leideyg’s cells in males to produce testesterone and in female it causes ovulation and secretion of female sex hormone estrogen from mature ovarian follicle & progesterone by corpus luteum.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 11

Function of enterogastrone is [1994]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 11

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

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 12

Ovulation occurs under the influence of [1994]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 12

Ovulation occurs under the influence of luteinizing hormone-LH secreted by the anterior lobe of pituitary.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 13

The mammalian corpus luteum produces  [1995]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 13

 Mammalian corpus luteum produces progesterone. It is essential for the continuation of pregnancy and it also stimulates acini glands.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 14

Nicotine acts as a stimulant, because it mimics the effect of [1995]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 14

Nicotine and acetylcholine have the same receptors-Nicotinic cholinergic receptors and hence have the same action. 

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 15

Which of the following endocrine gland stores its secretion in the extracellular space before discharging it into the blood? [1995]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 15

The thyroid gland stores its hormone secretion thyroglobulin in its follicles called extracellular space before discharing it into the blood.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 16

According to the accepted  concept of hormone action, if receptor molecules are removed from target organs, then the target organ will [1995]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 16

 The hormones in blood act on specific sites or receptors of target organ. So if we remove the receptor molecule from the target organs, there will be no response.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 17

Which of the following radioactive isotope is used in the detection of thyroid cancer? [1995, 02]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 17

Iodine is an element used by thyroid gland for the synthesis of thyroid hormones. Thus radioactive isotope Iodine -131 is used as radioactive material for detection of thyroid cancer.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 18

Which one of the following hormone stimulates the “let-down” (release) of milk from the mother’s breasts when the baby is sucking ? [1996]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 18

Prolactin is a proteinaceous hormone released by anterior lobe of pituitary. Prolactin supplements the action of gonadal hormones in stimulating the growth and activity of female mammary gland during  pregnancy and lactation. Oxytocin released by the posterior lobe of pituitary gland, is important for the mechanism of ejection of milk from the mammary glands due to sucking of breasts by infant. Progesterone, released by corpus luteum  brings about pregnancy changes such as uterine growth, implantation of embryo etc. Relaxin  is a proteinaceous hormone secreted by corpus luteum towards the end  of gestation period for loosening and softening of pelvic ligaments, relaxing of uterus for easing parturition.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 19

According to the “immunity theory” of ageing, the process starts with the gradual atrophy and disappearance of [1996]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 19

According  to the immunity theory ageing occurs due to the loss of power of defence against the invasion of germs and pathogens. The process starts with the gradual atrophy and disappearance of the thymus gland during middle age.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 20

In human adult females oxytocin [1996]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 20

Oxytocin also known as pitocin. It is an important hormone which is released in neurohypophysis of pituitary. It stimulate the contraction of smooth muscles. It stimulate labour pain and also increase labour pain. It is a hormone for quick birth. 1Its more secretion results in parturition. 

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 21

Hormones, thyroxine, adrenaline and the pigment melanin are formed from [1997]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 21

The amino acid glycine forms porphyrin ring in chlorophyll and haeme proteins like haemoglobin. Tryptophan gives rise to plant hormone indole- 3 - acetic acid.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 22

Calcitonin is a thyroid hormone which [1998]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 22

Calcitonin  is a polypeptide hormone which lowers calcium and phosphate level of plasma by inhibiting  bone degradation and stimulating their uptake by bone parathyroid  harmone elevates calcium level in blood.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 23

The most important component of the oral contraceptive pill is [1998]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 23

Use of contraceptive pills is a wide spread form of birth control. contraceptive pills contain estrogen and progesterone. The production of the pituitary hormones FSH & LH in the normal sexual cycle of a female is shut down by these hormones. In the absence of FSH, the ovarian follicles  do not ripe and ovulation does not occur in the absence of LH.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 24

Parathormone deficiency produces muscle ramps or tetany as a result of [1999]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 24

Parathormone released by the parathyroid gland  elevates the level of  Ca2+ in blood. The deficiency of this hormone lowers blood Ca2+. As a  result,  the excitability of muscles and nerves increases producing tetany -sustained contraction.

31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 25

Oxytocin helps in [1999]

Detailed Solution for 31 Years NEET Previous Year Questions:Chemical Coordination And Regulation - 3 - Question 25

Oxytocin is also called the ‘child birth hormone’. Prolactin helps in lactation. Luteinizing hormone levels trigger ovulation.

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