Chemical Co-ordination and Regulation

Class 11th Biology – 22 Chemical Co-ordination and Regulation MCQs

The first hormone was identified by____.

Correct! Wrong!

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The first hormone was identified by William Bayliss and Ernest Starling. These researchers showed that a substance(secretin) taken from the lining of the intestine could be injected into a dog to stimulate the pancreas to secrete fluid. Options A, C and D are incorrect.

Hormones influence body parts for bringing about

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Hormones influence body parts for bringing about co-ordination.

Intercellular communication in multicellular organism occurs through?

Correct! Wrong!

Intercellular communication in multicellular organism is through nervous and endocrine system.

The pituitary hormone which stimulates adrenal cortex is ____.

Correct! Wrong!

The pituitary hormone which stimulates adrenal cortex is ACTH. ACTH is adrenocorticotrophic hormone which stimulates the adrenal gland to secrete cortisol. Options A, C and D are incorrect.

The hormone receptors of the cell membrane are made up of specific ____.

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The hormone receptors of the cell membrane are made up of specific Protein. All hormone receptors are proteins that are specific to the hormone they bind to form hormone-receptor complex. Options A, C and D are incorrect.

Which amino acid is the precursor of the hormone melatonin?

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Melatonin is derived from the amino acid tryptophan. Options A, C and D are incorrect.

Adrenals are located above

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Adrenal or suprarenal glands are endocrine glands which are located above kidneys. It secretes corticoids, adrenaline and non adrenaline hormone.

Thyroxine is also known as ____ and is made in the ____ of the thyroid gland.

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Thyroxine is also known as tetraiodothyronine and is made in the follicular cells of the thyroid gland. The tetraiodothyronine or T4 is also known as thyroxine. T3 and T4 refers to the number of iodine molecules in each of the two hormones. Options A, B and D are incorrect.

Androgens are secreted by

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Androgens are secreted by testes.

Insulin acts on ____ and ____ enhancing cellular glucose uptake and utilization.

Correct! Wrong!

Insulin acts on hepatocytes and adipocytes enhancing cellular glucose uptake and utilization. Glucose is converted into storage components by insulin by hepatocytes and adipocytes. Options A, C and D are incorrect.

In case of stoppage of functioning of islets of Langerhans which hormone will be in short supply & what will be its effect?

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If islets of Langerhans stops functioning insulin & glucagon will be in short supply. So, the blood glucose level would increase.

Protein hormones bind with ____ receptors and steroid hormones bind with ____ receptors.

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Protein hormones bind with cell membrane receptors and steroid hormones bind with cytosol receptors. Options B, C and D are incorrect.

The reduced secretion of ____ will not sufficiently metabolize glucose and leads to the metabolic disorder _____.

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The reduced secretion of insulin will not sufficiently metabolize glucose and leads to the metabolic disorder diabetes mellitus. Options B and D are incorrect. Option C is incorrect. Diabetes insipidus is caused by the deficiency of ADH.

Which hormone possesses anti-insulin effects?

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Cortisol is secreted by the middle region of adrenal cortex. It increases the blood glucose level (which is anti-insulin effect) by converting protein & fats into glucose.

The mammalian corpus luteum produces

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Mammalian corpus luteum produces progesterone. It is essential for the continuation of pregnancy.

The hormone which allows the insects to shed their outer covering or exoskeletons is known as ____.

Correct! Wrong!

The hormone which allows the insects to shed their outer covering or exoskeletons is known as ecdysone.

The pancreas is a mixed gland because it has glands for both ____ and ____ secretions.

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The pancreas is a mixed gland because it has glands for both exocrine and endocrine secretions. The exocrine secretion is pancreatic juice for digestion process. The endocrine cells secrete insulin, glucagon and somatostatin. Options A, B and C are incorrect.

Melatonin is a hormone produced by

Correct! Wrong!

Melatonin is a hormone produced by pineal gland.

The hormone that is released when stimulated by nerves is ____.

Correct! Wrong!

The hormone that is released when stimulated by nerves is adrenaline. Adrenaline is for fighting stress or to overcome adverse situations and is also under neural control. Options A, B and C are incorrect.

The two types of hormones produced by hypothalamus are ____ hormone and the ____ hormone.

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The two types of hormones produced by hypothalamus are releasing hormone and the inhibitory hormone. These two secretions stimulate or inhibit the further secretions of the pituitary and thereby regulate the hormone function. Options A, C and D are incorrect. They are secreted directly or indirestly by the pituitary.

Thymus is very active till the ____ stage of man.

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Thymus is very active till the puberty stage of man. Options B, C and D are incorrect. The thymus is very large just after a child is born and weighs its greatest when a child reaches puberty. After puberty the thymus tissue is gradually replaced by fat.

The rise of blood sugar above the normal level is known as

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High sugar level in blood is called hyperglycemia.

Receptors for protein hormones are found

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Receptors for protein hormones are found on cell surface and steroid on the nuclear surface.

The primary function of T3 and T4 hormone of thyroid gland is to ____.

Correct! Wrong!

The primary function of T3 and T4 of thyroid gland is to enhance metabolic reactions like oxidation of nutrients. Thyroxine induces the oxidation of carbohydrates, proteins and fats to release energy and heat. Options A, B and D are incorrect.

Identify the non-endocrine glands that release hormones from the given options

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The heart, kidneys and liver are the non-endocrine glands that release hormones. Options A, C and D include organised endocrine glands also.

In human beings, which hormone functions as a stimulant for milk production?

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Hormone prolactin or mammotropin is secreted from anterior lobe of pituitary gland. Prolactin stimulates mammary glands for the synthesis of milk.

Deficiency of ADH or vasopressin will result in

Correct! Wrong!

ADH will enhance retention of water in Henle's loop.

Choose the correct reason for the development of simple goitre.

Correct! Wrong!

The diet is deficient in iodine. The inadequate supply of iodine will result in a condition known as hypothyroidism. A simple enlargement of part or all of the thyroid gland occurs and it is known as goitre. Options B, C and D are incorrect.

Insulin promotes

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Insulin changes blood glucose into glycogen called glycogenesis.

The first identified hormone was known as ____.

Correct! Wrong!

The first identified hormone was known as secretin. Options A, B and D are incorrect.

Class 11th Biology - 22 Chemical Co-ordination and Regulation MCQs
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Class 11th Biology - 22 Chemical Co-ordination and Regulation MCQs