Download NEET MCQs for NEET Biology: Chemical Coordination and Integration
Review structured MCQ sets for NEET Biology Chemical Coordination and Integration. Built according to official NEET guidelines, these downloadable questions support daily revision and core concept reinforcement.
Chapter-wise Objective Questions: Chemical Coordination and Integration
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Multiple Choice Questions
(a) Directly into blood
(b) Into blood or ducts
(c) When they are cut
(d) into particular organ
Show Answer & Explanation
Answer: (a) Directly into blood
Explanation:
1. Endocrine glands are ductless and pour their secretions (hormones) directly into the blood.
Teacher's Note:
1. Exocrine glands use ducts.
2. Hormones go directly into blood.
(a) Nucleus
(b) Endoplasmic reticulum
(c) Cytoplasm
(d) Cell-surface
Show Answer & Explanation
Answer: (d) Cell-surface
Explanation:
1. Protein and peptide hormones cannot cross the membrane, so their receptors are on the cell surface.
Teacher's Note:
1. Steroid hormones have intracellular receptors.
2. Protein hormone receptors are on the cell surface.
(a) Internal secretion mostly discharged in the blood by endocrine glands
(b) Secretion of exocrine glands
(c) Chemical substances secreted into the gut
(d) Inorganic catalysts
Show Answer & Explanation
Answer: (a) Internal secretion mostly discharged in the blood by endocrine glands
Explanation:
1. Hormones are internal secretions released mostly into the blood by endocrine glands.
Teacher's Note:
1. Exocrine secretions use ducts.
2. Hormones are internal secretions.
(a) Continue to respond but require higher concentration of hormone.
(b) Continue to respond but in opposite way.
(c) Continue to respond without any difference.
(d) Not respond to hormone.
Show Answer & Explanation
Answer: (d) Not respond to hormone.
Explanation:
1. Without receptors the target cells cannot recognise the hormone, so they do not respond.
Teacher's Note:
1. Receptors give specificity.
2. No receptor means no response.
(a) Thyroid
(b) Adrenal cortex
(c) Adrenal medulla
(d) Testes
Show Answer & Explanation
Answer: (c) Adrenal medulla
Explanation:
1. The anterior pituitary controls thyroid, adrenal cortex and gonads through tropic hormones, but the adrenal medulla is controlled by the sympathetic nerves.
Teacher's Note:
1. ACTH acts on the cortex.
2. Adrenal medulla is not under the pituitary.
(a) FSH
(b) LTH
(c) LH
(d) Vasopressin RCISE
Show Answer & Explanation
Answer: (a) FSH
Explanation:
1. FSH from the anterior pituitary stimulates spermatogenesis in the seminiferous tubules.
Teacher's Note:
1. LH acts on Leydig cells.
2. FSH controls spermatogenesis.
(a) Vasopressin
(b) Oxytocin
(c) Oxytocin & prolactin
(d) Vasopressin & oxytocin
Show Answer & Explanation
Answer: (d) Vasopressin & oxytocin
Explanation:
1. The neurohypophysis stores and releases the hormones vasopressin (ADH) and oxytocin made by the hypothalamus.
Teacher's Note:
1. It does not make them itself.
2. Both vasopressin and oxytocin are released.
(a) Adrenals
(b) Thyroid
(c) Pituitary
(d) Thymus
Show Answer & Explanation
Answer: (c) Pituitary
Explanation:
1. Growth hormone is secreted by the anterior pituitary.
Teacher's Note:
1. Excess causes gigantism.
2. GH is pituitary hormone.
(a) Interstitial cells of testis
(b) Adrenal cortex
(c) Adenohypophysis
(d) Posterior part of thyroid
Show Answer & Explanation
Answer: (c) Adenohypophysis
Explanation:
1. Gonadotrophic hormones FSH and LH are produced by the adenohypophysis (anterior pituitary).
Teacher's Note:
1. They act on gonads.
2. Adenohypophysis makes FSH and LH.
(a) Influence the activity of thyroid gland
(b) Control development of graffian follicles
(c) Initiate and maintain secretion of milk by mammary gland
(d) Cause ejection of milk
Show Answer & Explanation
Answer: (c) Initiate and maintain secretion of milk by mammary gland
Explanation:
1. Prolactin initiates and maintains milk secretion by mammary glands. Oxytocin causes milk ejection.
Teacher's Note:
1. It is secreted by the anterior pituitary.
2. Prolactin makes milk.
(a) Concentration of urine
(b) Quick digestion
(c) Dilution of urine
(d) Slow heart beat
Show Answer & Explanation
Answer: (a) Concentration of urine
Explanation:
1. Vasopressin (ADH) increases water reabsorption by the kidney tubules and so concentrates the urine.
Teacher's Note:
1. Lack causes diabetes insipidus.
2. ADH concentrates urine.
(a) Adrenaline
(b) Progesterone
(c) Oxytocin
(d) Prolactin
Show Answer & Explanation
Answer: (c) Oxytocin
Explanation:
1. Oxytocin stimulates strong contraction of the uterine muscles during child birth.
Teacher's Note:
1. It also ejects milk.
2. Oxytocin causes labour contractions.
(a) Adrenal cortex
(b) Anterior lobe of pituitary gland
(c) Middle lobe of pituitary gland
(d) Posterior lobe of pituitary gland
Show Answer & Explanation
Answer: (b) Anterior lobe of pituitary gland
Explanation:
1. FSH is produced by the anterior lobe of the pituitary gland (adenohypophysis).
Teacher's Note:
1. It acts on gonads.
2. FSH comes from anterior pituitary.
(a) Parathyroid
(b) Thyroid
(c) Pituitary
(d) Thymus
Show Answer & Explanation
Answer: (b) Thyroid
Explanation:
1. Thyroid hormones thyroxine and tri-iodothyronine regulate the basal metabolic rate.
Teacher's Note:
1. Low thyroxine lowers BMR.
2. Thyroid controls BMR.
(a) Hyper calcemia
(b) Hypocalcaemia
(c) Goitre
(d) All
Show Answer & Explanation
Answer: (b) Hypocalcaemia
Explanation:
1. Parathormone raises blood calcium, so its deficiency lowers blood calcium (hypocalcaemia) and may cause tetany.
Teacher's Note:
1. Goitre is due to iodine lack.
2. Deficiency causes hypocalcaemia.
(a) Thyroid stimulating hormone
(b) Thyroxine
(c) Calcitonin
(d) Parathormone
Show Answer & Explanation
Answer: (b) Thyroxine
Explanation:
1. Cretinism in infants results from low secretion of thyroxine (hypothyroidism).
Teacher's Note:
1. It stunts growth and mind.
2. Cretinism is due to thyroxine lack.
(a) Inter thyroidal connective
(b) Inter thyroidal commissure
(c) Interme diary lobe
(d) Isthumus
Show Answer & Explanation
Answer: (d) Isthumus
Explanation:
1. The two lobes of the thyroid are connected by a thin flap of connective tissue called the isthmus.
Teacher's Note:
1. The gland lies on the trachea.
2. Lobes join by the isthmus.
(a) Adrenal cortex
(b) Adrenal medulla
(c) Parathyroid
(d) Thyroid
Show Answer & Explanation
Answer: (a) Adrenal cortex
Explanation:
1. Aldosterone from the adrenal cortex retains sodium in the body and excretes potassium.
Teacher's Note:
1. Medulla secretes adrenaline.
2. Adrenal cortex retains sodium.
(a) Adrenaline
(b) Noradrenaline
(c) Glucocorticoids
(d) Mineralo Corticoids
Show Answer & Explanation
Answer: (c) Glucocorticoids
Explanation:
1. The adrenal cortex hormones glucocorticoids, such as cortisol, control carbohydrate metabolism, raising blood glucose.
Teacher's Note:
1. Mineralocorticoids control salts.
2. Glucocorticoids control carbohydrates.
Chemical Coordination and Integration Objective Questions & Solutions for NEET Biology
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FAQs
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