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NEET • BIOLOGY • CHEMICAL COORDINATION AND INTEGRATION

Chemical coordination and integration practice · Hard

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Showing 1-30 of 31 questions

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1 Hard
1 of 31
Understanding +4 | -1
Which of the following statement is correct in relation to the
endocrine system?
View answer and explanation
Correct option: C
Non-nutrient chemicals produced by the body in trace
amount that act as inter-cellular messenger are known as
hormones
Option D is correct because hormones are defined as non-nutrient chemicals produced in trace amounts that act as intercellular messengers.
2 Hard
2 of 31
Understanding +4 | -1
In the homeostatic control of blood sugar level, which organs function as modulator and effector respectively?
View answer and explanation
Correct option: C
Hypothalamus and islet of Langerhans
Option B (Hypothalamus and islet of Langerhans) is correct because the hypothalamus acts as the modulator and the islet of Langerhans acts as the effector in blood sugar control.
3 Hard
3 of 31
Remembering +4 | -1
Sella turcica is a depression in the sphenoid bone which lodges
View answer and explanation
Correct option: B
Hypophysis
Option B (Hypophysis) is correct because the sella turcica is a saddle-shaped depression in the sphenoid bone that houses the pituitary gland (hypophysis).
4 Hard
4 of 31
Application +4 | -1
A tumor in the adrenal zona glomerulosa car cause hyper secretion of hormones produced in that region. Which of the following you migh expect to find in a patient with such a tumor:
View answer and explanation
Correct option: A
Increased blood sodium levels
Option A (Increased blood sodium levels) is correct because aldosterone, produced in the zona glomerulosa, promotes sodium reabsorption in the kidneys, leading to increased blood sodium levels when hypersecreted.
5 Hard
5 of 31
Remembering +4 | -1
Select the incorrect statement about pineal gland
View answer and explanation
Correct option: D
Decreases blood Ca+2Ca^{+2} level
Option D (Decreases blood Ca+2Ca^{+2} level) is correct because the pineal gland does not directly regulate blood calcium levels. Calcitonin, secreted by the thyroid gland, decreases blood calcium levels.
6 Hard
6 of 31
Remembering +4 | -1
Blood pressure lowering hormone is secreted from an organ, present in
View answer and explanation
Correct option: A
Thoracic cavity
Option A (Thoracic cavity) is correct because the atrial natriuretic peptide (ANP), a blood pressure lowering hormone, is secreted from the heart, which is present in the thoracic cavity.
7 Hard
7 of 31
Remembering +4 | -1
Select an ovarian hormone, which requires secondary messenger for their action.
View answer and explanation
Correct option: C
Relaxin
The correct answer is C (Relaxin) because it uses a secondary messenger system for its action, unlike steroid hormones.
8 Hard
8 of 31
Remembering +4 | -1
Bradykinin is a
View answer and explanation
Correct option: B
Hormone
Option B (Hormone) is correct because bradykinin is a peptide hormone involved in inflammation and blood pressure regulation.
9 Hard
9 of 31
Understanding +4 | -1
When immunoglobulins are synthesised in the body against the bodies own cells, certain disorders are produced. Which of the following is not an example of such a disorder?
View answer and explanation
Correct option: C
Toxic nodular goitre
The correct answer is C (Toxic nodular goitre) because it is not primarily caused by autoantibodies, unlike the other options.
10 Hard
10 of 31
Understanding +4 | -1
X\mathrm{X} and Y\mathrm{Y} are hormones. X\mathrm{X} stimulates the secretion of YY, which exerts negative feedback on the cells that secretes XX. What happens when the blood level of YY decreases?
View answer and explanation
Correct option: B
More XX is secreted
Option B (More X is secreted) is correct because when Y decreases, the negative feedback is reduced, leading to increased secretion of X to stimulate Y production.
11 Hard
11 of 31
Remembering +4 | -1
Which of them are the second messengers? I. Cyclic AMP II. IP3I{P_3} III. Ca(2+)C{a^{(2 + )}} The correct option is
View answer and explanation
Correct option: D
I, II and III
Option D (I, II and III) is correct because Cyclic AMP, IP3I{P_3}, and Ca(2+)C{a^{(2 + )}} are all well-established second messengers in cellular signaling pathways.
12 Hard
12 of 31
Understanding +4 | -1
Polydipsia, hyperglycemia and polyuria occur due to
View answer and explanation
Correct option: A
Undersecretion of insulin
Option A (Undersecretion of insulin) is correct because undersecretion of insulin leads to hyperglycemia, which causes polydipsia and polyuria.
13 Hard
13 of 31
Understanding +4 | -1
Steroid hormones transmit their information by
View answer and explanation
Correct option: C
Entering into the cell and modifying nuclear gene expression
Option C (Entering into the cell and modifying nuclear gene expression) is correct because steroid hormones directly affect gene transcription after entering the cell.
14 Hard
14 of 31
Remembering +4 | -1
In Human pancreas representing only _________ percentage of endocrine part and it consists of ______ cells.
View answer and explanation
Correct option: C
X - 1 to 2 %, Y - Islets of Langerhans
Option C (X - 1 to 2 %, Y - Islets of Langerhans) is correct because the endocrine part of the pancreas is only 1-2% and consists of Islets of Langerhans.
15 Hard
15 of 31
Understanding +4 | -1
An endocrine gland 'P' secretes a hormone 'R' which acts on another endocrine gland 'S' to stimulate the secretion of steroidal hormone 'T'. Identify the P, R, S and T.
View answer and explanation
Correct option: D
P - Pars distalis, R - ACTH, S - Adrenal cortex, T - Adreno corticoids
Option D (P - Pars distalis, R - ACTH, S - Adrenal cortex, T - Adreno corticoids) is correct because the anterior pituitary (pars distalis) secretes ACTH, which stimulates the adrenal cortex to secrete adrenocorticoids.

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ANIMAL KINGDOM 756 MCQs PLANT KINGDOM 415 MCQs ANATOMY OF FLOWERING PLANTS 404 MCQs MOLECULAR BASIS OF INHERITANCE 404 MCQs PRINCIPLE OF INHERITANCE AND VARIATION 374 MCQs EVOLUTION 362 MCQs
16 Hard
16 of 31
Remembering +4 | -1
How many matching are correct with reference to adrenal gland

(a) Zona reticularis – Gonadocorticoids

(b) Zona Fasciculata – Glucocorticoids

(c) Zona glomerulosa – Mineralocorticoids

(d) Zona reticularis – Mineralocorticoids
View answer and explanation
Correct option: A
Three
Option D (One) is correct because only one matching is correct: Zona Fasciculata – Glucocorticoids.
17 Hard
17 of 31
Remembering +4 | -1
The development of adult characteristics in a moulting insect is promoted by:
View answer and explanation
Correct option: B
Ecdysone
Option B (Ecdysone) is correct because ecdysone promotes the development of adult characteristics in moulting insects.
18 Hard
18 of 31
Remembering +4 | -1
Growth hormone and thyroxine increase the length of:
View answer and explanation
Correct option: A
Bone
Option A is correct because growth hormone and thyroxine both promote bone growth, increasing the length of bones.
19 Hard
19 of 31
Remembering +4 | -1
Moulting hormone is secreted by
View answer and explanation
Correct option: B
Prothoracic gland
Option B (Prothoracic gland) is correct because the moulting hormone (ecdysone) is secreted by the prothoracic gland in insects.
20 Hard
20 of 31
Understanding +4 | -1
Assertion (A): Size of thymus increases with the advancement of age.

Reason (R): Thymosin secretion has no role in immunity.
View answer and explanation
Correct option: D
Both assertion and reason are false.
Option D is correct because both the assertion and the reason are false. The thymus decreases in size with age, and thymosin plays a role in immunity.
21 Hard
21 of 31
Analyzing +4 | -1
Which is a wrong statement
(a) IP3\mathrm{IP}_3 is a secondary messenger
(b) Cortisol is a protein hormone
(c) RAAS secretes glucocorticoids
(d) TSH is not secreted by pituitary gland
View answer and explanation
Correct option: C
b, c and d
Option C is correct because Cortisol is a steroid hormone, not a protein hormone; RAAS secretes mineralocorticoids (aldosterone), not glucocorticoids; and TSH is secreted by the pituitary gland.
22 Hard
22 of 31
Understanding +4 | -1
Which is a wrong statement :

(a) Endocrine glands secretes FSH, LH, MSH

(b) Salivary gland are exocrine gland

(c) Exocrine gland secretes lipase, amylase

(d) Cuboidal or columnar epithelium act as gland
View answer and explanation
Correct option: D
None of these
Option D (None of these) is correct because all the statements are correct.
23 Hard
23 of 31
Understanding +4 | -1
Molecule that bind the receptor and induces cell the post-receptor events is called …A… and molecule that bind to the receptor and inhibit all the post-receptor events is called …B….
View answer and explanation
Correct option: D
A-agonist, B-antagonist
Option D (A-agonist, B-antagonist) is correct because an agonist activates the receptor, while an antagonist inhibits it.
24 Hard
24 of 31
Understanding +4 | -1
Match the source of gland with its respective hormone as well as the function.
View answer and explanation
Correct option: B
Posterior pituitary Vasopressin Stimulates resorption of water in the distal tubules in the nephron
The correct answer is B because Vasopressin, released by the posterior pituitary, stimulates water reabsorption in the distal tubules of the nephron.
25 Hard
25 of 31
Remembering +4 | -1
_______ stimulates the synthesis and secretion of steroid hormones from the ______.
View answer and explanation
Correct option: B
Gonadotropins, Gonads
Option B (Gonadotropins, Gonads) is correct because gonadotropins (LH and FSH) stimulate the synthesis and secretion of steroid hormones from the gonads (ovaries and testes).
26 Hard
26 of 31
Understanding +4 | -1
[A]: Behavioural activities that are correlated with a one week cycle under fairly constant conditions are called circadian rhythms.

[R]: Experiments have proved that biological clock is entirely internal.
View answer and explanation
Correct option: D
Both A and R are false
Option D (Both A and R are false) is correct because behavioral activities correlated with a one-week cycle are called circaseptan rhythms, not circadian rhythms, and the biological clock is not entirely internal as it is influenced by external cues like light.
27 Hard
27 of 31
Understanding +4 | -1
Select the correct matching :
View answer and explanation
Correct option: C
Thymosin – Promotes production of
antibodies to provide humoral immunity also
The correct answer is C because Thymosin promotes the production of antibodies, which is a key component of humoral immunity.
28 Hard
28 of 31
Understanding +4 | -1
The same peptide hormone will show variation in response to different cells because
View answer and explanation
Correct option: B
a target cells' response is determined by the components of its signal transduction pathways
Option B (a target cells' response is determined by the components of its signal transduction pathways) is correct because different cells have different intracellular signaling components that determine the response to the same hormone.
29 Hard
29 of 31
Remembering +4 | -1
The blood glucose level is commonly expressed as:
View answer and explanation
Correct option: B
milligram per deci litre
Option B (milligram per deci litre) is correct because blood glucose levels are commonly expressed in mg/dL.
30 Hard
30 of 31
Understanding +4 | -1
Arrange the sequence of action of work of FSH?

(a) Binding to membrane receptor

(b) Biochemical response

(c) Generation of second messenger

(d) Physiological response (e.g.,Ovarian growth)
View answer and explanation
Correct option: B
(a) → (c) → (b) → (d)
Option B ((a) → (c) → (b) → (d)) is correct because FSH, being a peptide hormone, first binds to the membrane receptor, generates a second messenger, then causes a biochemical response, and finally a physiological response.
Revision notes and key takeaways

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Key Takeaways

  • ✓ This set contains 31 single-correct-answer MCQs on CHEMICAL COORDINATION AND INTEGRATION.
  • ✓ Try each question before opening its answer. Read the explanation where one is available.
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