Tag: biology

Questions Related to biology

Excess secretion of growth hormone in adults leads to

  1. acromegaly

  2. goitre

  3. gigantism

  4. dwarfism


Correct Option: A
Explanation:

Overproduction of growth hormone causes excessive growth. In children, the condition is called gigantism. In adults, it is called acromegaly. Overproduction of growth hormone is almost always caused by a noncancerous (benign) pituitary tumor (adenoma). 

So, the correct option is 'acromegaly'.

Which one of the following statements is correct ? 

  1. Neurons regulate endocrine activity, but not vice versa

  2. Endocrine glands regulate neural activity and nervous system regulates endocrine glands

  3. Neither hormones control neural activity nor the neurons control endocrine activity

  4. Endocrine glands regulate neural activity but not vice versa


Correct Option: A
Explanation:

  • The central nervous system and the peripheral nervous system are the two major parts of the nervous system.
  • The peripheral nervous system is further divided into two types- the somatic nervous system and the autonomic nervous system. 
  1. The somatic system controls the sense organs and voluntary muscles. 
  2. The autonomic nervous system controls the internal organs and regulates the secretion from the endocrine glands of the body. 
  • Hence, the nervous system is capable of controlling the endocrine glands, but the endocrine glands cannot regulate the functioning of the nervous system.
  • So, the correct answer is 'Neurons regulate endocrine activity, but not vice versa'.

Which of the following is the correct function of endocrine system with reference to chemical coordination?

  1. Provides neural integration through hormones

  2. Provides chemical integration through hormones

  3. Provides an organised network of point to point connections for a quick coordination

  4. None of these


Correct Option: B
Explanation:
  • The endocrine system is the collection of glands that produce hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood, among other things.
  • Hormones act on nearby tissues or are carried in the bloodstream to act on specific target organs and distant tissues. 
  • Hence Provides chemical integration through hormones is the correct function of the endocrine system with reference to chemical coordination.
  • So, the correct answer is 'Provides chemical integration through hormones '.

Which of the following are correct.

a) Neural coordination is fast but short-lived. 

b) Secretions of the ductless gland are messengers. 

c) Hormones are non-nutrient chemicals.

d) Hormones act as intracellular messengers.

e) Chemical messengers produced in large amounts.

  1. a, b, and d

  2. b, c, and d

  3. a, b, and c

  4. a, b, c, and d


Correct Option: C
Explanation:

$\Rightarrow$ Properties of Hormones

$\bullet$ Hormones are non-nutrient chemicals which act as intercellular messengers and are produced in trace amount.
$\bullet$ Hormones do not provide energy or building materials but they do have effects on growth differentiation.
$\bullet$ They may accelerate or inhibit a specific physiological process.
$\bullet$ Hormones are often used up in their regulatory action.

Given is an incomplete table on hormones, their source glands and one major effect of each human body. Identify the option representing correct grouping of hormone its gland and effect.

Gland Secretion Effect on body
A Oestrogen Maintenance of secondary sexual characters
Alpha cells of Islets of Langerhans B Raises blood sugar level
Anterior pituitary C Over secretion leads to gigantism


  1. A- ovary, B-glucagon, C-growth hormone

  2. A-placenta, B-insulin, C-vasopressin

  3. A-ovary, B-insulin, C-calcitonin

  4. A-placenta, B-glucagon, C-calcitonin


Correct Option: A

Which of the following hormone functions through generating second messengers ?

  1. lodothyroglobulin

  2. Estrogen

  3. Adrenaline

  4. Estradiole


Correct Option: A

How many of the following hormones have nuclear receptors?
Thyroxine, Catecholamines, Cortisol, Cholecystokinin, Growth hormone.

  1. $2$

  2. $3$

  3. $4$

  4. $5$


Correct Option: A

Hormones are called chemical signals that stimulate specific target tissues. Their specificity is due to the presence of signal receiving receptors only in the respective target tissues. Where are these receptors present in case of hormones of protein nature?

  1. Extra cellular matrix

  2. Blood

  3. Plasma membrane

  4. Nucleus


Correct Option: A

Hormones involved in maintaining $Ca^{2+}$ balance in human body includes all except

  1. cortisol

  2. aldosterone

  3. Parathormone

  4. thyrocalcitonin


Correct Option: A

I. Insulin 
II. Epinephrine 
III.Oestradiol
IV.Norepinephrine
V.Testosterone
VI.Glucagon
Which of the above hormones are amino acid derivatives?

  1. I and II

  2. III and IV

  3. V and VI

  4. II and IV


Correct Option: A