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NEET • BIOLOGY • CHEMICAL COORDINATION AND INTEGRATION

Chemical coordination and integration practice · Mixed difficulty

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Showing 91-120 of 381 questions

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91 Easy
91 of 381
Remembering +4 | -1
Group of neurosecretory cells present in hypothalamus are mainly responsible for
View answer and explanation
Correct option: B
Secretion of hormones
The correct answer is Secretion of hormones because neurosecretory cells in the hypothalamus produce hormones that regulate the pituitary gland.
92 Easy
92 of 381
Remembering +4 | -1
The gland which performs both endocrine and exocrine function is
View answer and explanation
Correct option: C
Pancreas
Option C (Pancreas) is correct because the pancreas has both endocrine (hormone secretion) and exocrine (enzyme secretion) functions.
93 Easy
93 of 381
Remembering +4 | -1
Which hormone produces calorigenic effect?
View answer and explanation
Correct option: A
Thyroxine
Option A (Thyroxine) is correct because thyroxine (T4), a thyroid hormone, increases the basal metabolic rate and thus produces a calorigenic effect, increasing heat production in the body.
94 Easy
94 of 381
Understanding +4 | -1
Which of following is not a role of parathormone?
View answer and explanation
Correct option: D
Decreased Ca2+{Ca}^{2+} absorption by the renal tubules
Option D (Decreased Ca2+{Ca}^{2+} absorption by the renal tubules) is correct because parathormone increases, not decreases, calcium reabsorption by the renal tubules.
95 Medium
95 of 381
Remembering +4 | -1
______ gland degenerates in old age, causing weakening of immune response.
View answer and explanation
Correct option: A
Thymus
The correct answer is A (Thymus) because the thymus gland degenerates with age, leading to a decline in immune function.
96 Easy
96 of 381
Understanding +4 | -1
Statement-A : Hormones are nutrient chemical molecules ingested with balanced diet.

Statement-B : Hormones act as intracellular messengers and are produced in trace amounts. Choose the correct option.
View answer and explanation
Correct option: C
Both statements AA and BB are incorrect
Option C (Both statements AA and BB are incorrect) is correct because hormones are not nutrients and act as intercellular messengers.
97 Easy
97 of 381
Remembering +4 | -1
Calcium level decreases in the blood due to hyposecretion of
View answer and explanation
Correct option: A
Parathyroid hormone
Option A (Parathyroid hormone) is correct because parathyroid hormone increases blood calcium levels, so its hyposecretion would lead to decreased blood calcium.
98 Easy
98 of 381
Remembering +4 | -1
Sella turcica protects our
View answer and explanation
Correct option: D
Pituitary
Option D (Pituitary) is correct because the sella turcica is a saddle-shaped depression in the sphenoid bone that houses and protects the pituitary gland.
99 Easy
99 of 381
Understanding +4 | -1
Vasopressin stimulates reabsorption of water and reduction of urine secretion. Hence, vasopressin is otherwise called
View answer and explanation
Correct option: C
Antidiuretic hormone
Option C (Antidiuretic hormone) is correct because vasopressin promotes water reabsorption in the kidneys, reducing urine output, hence it's also known as antidiuretic hormone (ADH).
100 Medium
100 of 381
Analyzing +4 | -1
Assertion: Adrenal cortex is not vital for survival and may be removed without subsequently leading to death.

Reason: Adrenal cortex secretes a number of steroid hormones which have only cumulative effects on the hormones of other glands.
View answer and explanation
Correct option: D
Both assertion and reason are false.
Option D (Both assertion and reason are false) is correct because the adrenal cortex is vital for survival, and its hormones have specific, not just cumulative, effects.
101 Medium
101 of 381
Understanding +4 | -1
Which statement is incorrect regarding pineal gland?
View answer and explanation
Correct option: A
Located on the ventral side of fore brain
Option A (Located on the ventral side of fore brain) is correct because the pineal gland is located on the dorsal side of the forebrain, not the ventral side.
102 Hard
102 of 381
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.
103 Hard
103 of 381
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.
104 Medium
104 of 381
Remembering +4 | -1
Cholecystokinin is secretion of
View answer and explanation
Correct option: A
Duodenum that causes contraction of gall bladder
Option A (Duodenum that causes contraction of gall bladder) is correct because Cholecystokinin (CCK) is secreted by the duodenum and stimulates the contraction of the gallbladder, releasing bile to aid in digestion.
105 Hard
105 of 381
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.
106 Medium
106 of 381
Understanding +4 | -1
The hydrophilic hormones interact with …A… . While the hydrophobic hormones interact with …B… Choose the correct option for A and B
View answer and explanation
Correct option: A
A-cell membrane receptors; B-nuclear receptors
Option A (A-cell membrane receptors; B-nuclear receptors) is correct because hydrophilic hormones bind to cell membrane receptors, while hydrophobic hormones bind to nuclear receptors.
107 Easy
107 of 381
Understanding +4 | -1
In males, the spermatogenesis is regulated by
View answer and explanation
Correct option: C
Both (a) and (b)
Option C (Both (a) and (b)) is correct because both FSH and androgens are essential for spermatogenesis in males.
108 Hard
108 of 381
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.
109 Medium
109 of 381
Analyzing +4 | -1
Which of the following is incorrectly paired?
View answer and explanation
Correct option: C
Progesterone – Increased Plasma glucose level
Option C (Progesterone – Increased Plasma glucose level) is correct because progesterone does not directly increase plasma glucose levels. It primarily supports pregnancy.
110 Easy
110 of 381
Understanding +4 | -1
Glycosuria and ketonuria is indicative of
View answer and explanation
Correct option: B
Diabetes mellitus
Option B (Diabetes mellitus) is correct because glycosuria (glucose in urine) and ketonuria (ketones in urine) are classic indicators of uncontrolled diabetes mellitus.
111 Medium
111 of 381
Remembering +4 | -1
Receptor hormone complex is formed when, the binding of
View answer and explanation
Correct option: A
Hormone to its respective receptor takes place
Option A (Hormone to its respective receptor takes place) is correct because the receptor-hormone complex is formed when a hormone binds to its specific receptor.
112 Easy
112 of 381
Remembering +4 | -1
Which one of the following pairs of organs includes only the endocrine glands?
View answer and explanation
Correct option: A
Parathyroid and adrenal
Option A (Parathyroid and adrenal) is correct because both parathyroid and adrenal glands are exclusively endocrine glands.
113 Easy
113 of 381
Understanding +4 | -1
According to accepted concept of hormonal action, if receptor molecules are removed from target organs, then the target organ will
View answer and explanation
Correct option: D
Not respond to the hormone
Option D (Not respond to the hormone) is correct because receptors are essential for hormone binding and initiating a response in the target organ.
114 Medium
114 of 381
Understanding +4 | -1
I. Hypothyroidism causes irregularity of menstrual cycle
II. Hyperthyroidism adversely affects the body physiology
III. Hypothyroidism cause cretinism
IV. Hypothyroidism causes goitre
Which of the above statements are correct?
Choose the correct option
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because all the statements regarding hypothyroidism and its effects are accurate.
115 Easy
115 of 381
Understanding +4 | -1
Assertion: Vasopressin is also known as anti-diueretic hormone.

Reason: Vasopressin stimulates the reabsorption of water and electrolyte by distal tubules and there by
reduces diuresis.
View answer and explanation
Correct option: A
If both the assertion and the reason are true and the reason is a correct explanation of the assertion
The correct answer is A (If both the assertion and the reason are true and the reason is a correct explanation of the assertion) because vasopressin's antidiuretic effect is due to its stimulation of water reabsorption.
116 Easy
116 of 381
Remembering +4 | -1
Islets of Langerhans is a normal human pancreas comprise only
View answer and explanation
Correct option: B
1-2% of pancreatic tissue
Option B (1-2% of pancreatic tissue) is correct because Islets of Langerhans, the endocrine component of the pancreas, constitute only a small fraction of the total pancreatic mass.
117 Easy
117 of 381
Understanding +4 | -1
Hormones are non-nutrient chemicals, which acts as…….. messengers and are produced in trace amount
View answer and explanation
Correct option: A
Intercellular
Option A (Intercellular) is correct because hormones act as intercellular messengers.
118 Easy
118 of 381
Understanding +4 | -1
An adenohypophysis hormone, which is regulated by feedback mechanism is
View answer and explanation
Correct option: B
TSH
Option B (TSH) is correct because TSH (Thyroid Stimulating Hormone) is an adenohypophysis hormone regulated by a feedback mechanism involving thyroid hormones.
119 Medium
119 of 381
Understanding +4 | -1
Rapid increase in the blood sugar level of a patient can be immediately reduced by
View answer and explanation
Correct option: B
Injecting insulin intramuscularly
Option A (Injecting insulin intravenously) is correct because intravenous injection allows for the fastest absorption and action of insulin.
120 Medium
120 of 381
Remembering +4 | -1
Decrease in the calcium level in blood is caused by
View answer and explanation
Correct option: B
Calcitonin
Option B (Calcitonin) is correct because calcitonin, secreted by the thyroid gland, lowers blood calcium levels by inhibiting bone resorption and increasing calcium excretion.
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