286298
Assertion :Diabetes insipidus is marked by excessive urination and too much thirst of water.
Reason: Vasopressin (ADH) is released by the posterior lobe of pituitary gland.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(a) Diabetes insipidus (DI) occurs when the kidneys are unable to conserve water. The amount of water conserved is controlled by antidiuretic hormone, ADH, (also called vasopressin) which is secreted by posterior lobe of pituitary gland. Diabetes insipidus is characterised by excessive urination and thirst, due to the increase in permeability of collecting tubules.
NCERT Page-333 & 334 / N-241
Chemical Coordination and Integration (NCERT)
286299
Assertion: Our body secretes adrenaline during emergency. Reason: Adrenaline raises metabolic rate.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(a) Adrenaline secreted from adrenal medulla, is an emergency hormone whose concentration increases under stress conditions, e.g. cold, stress. It initiates many bodily responses, including the stimulation of heart action and an increase in blood pressure, metabolic rate, and blood glucose concentration.
NCERT Page-336 / N-244
Chemical Coordination and Integration (NCERT)
286300
Assertion: Immune response of old persons become weak. Reason: Thymus degenerates in old individuals.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(d) Thymus piays a major role in the development of the immune system. This gland secretes the peptide hormones called thymosins. Thymosins play a major role in the differentiation of T-lymphocytes, which provide cellmediated immunity. In addition, thymosins also promote production of antibodies to provide humoral immunity. Thymus is degenerated in old individuals resulting in a decreased production of thymosins. As a result, the immune responses of old persons become weak.
NCERT Page-335 / N-243
Chemical Coordination and Integration (NCERT)
286301
Assertion: Prolactin is also called the 'milk ejection hormone'.
Reason: Oxytocin stimulates the smooth muscle contractions of the mammary glands.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(c) Oxytocin hormone is also known as 'milk ejection hormone' because oxytocin induces contractions of the mammary gland muscles and helps in the flow of stored milk from the mammary glands to the mouth of the suckling infant. Oxytocin contracts the smooth muscles of uterus and mammary glands. Uterine contractions, stimulated by oxytocin at the end of pregnancy, help in child-birth. That is why, it is also called 'birth hormone'. Prolactin or lactogenic hormone or luteotrophic hormone (LTH) is secreted by the anterior pituitary which helps in the growth of mammary glands during pregnancy and initiates the secretion of milk after child-birth.
NCERT Page-333 & 334 / N-241
Chemical Coordination and Integration (NCERT)
286302
Assertion: Oxytocin is called as 'milk-ejection hormone'. Reason: Thymosin acts on the smooth muscles
of our body and stimulates their contraction.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(b) Oxytocin acts on the smooth muscles of our body and stimulates their contraction. In females, it stimulates a vigorous contraction of uterus at the time of child birth, and milk ejection from the mammary gland during suckling.
286298
Assertion :Diabetes insipidus is marked by excessive urination and too much thirst of water.
Reason: Vasopressin (ADH) is released by the posterior lobe of pituitary gland.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(a) Diabetes insipidus (DI) occurs when the kidneys are unable to conserve water. The amount of water conserved is controlled by antidiuretic hormone, ADH, (also called vasopressin) which is secreted by posterior lobe of pituitary gland. Diabetes insipidus is characterised by excessive urination and thirst, due to the increase in permeability of collecting tubules.
NCERT Page-333 & 334 / N-241
Chemical Coordination and Integration (NCERT)
286299
Assertion: Our body secretes adrenaline during emergency. Reason: Adrenaline raises metabolic rate.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(a) Adrenaline secreted from adrenal medulla, is an emergency hormone whose concentration increases under stress conditions, e.g. cold, stress. It initiates many bodily responses, including the stimulation of heart action and an increase in blood pressure, metabolic rate, and blood glucose concentration.
NCERT Page-336 / N-244
Chemical Coordination and Integration (NCERT)
286300
Assertion: Immune response of old persons become weak. Reason: Thymus degenerates in old individuals.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(d) Thymus piays a major role in the development of the immune system. This gland secretes the peptide hormones called thymosins. Thymosins play a major role in the differentiation of T-lymphocytes, which provide cellmediated immunity. In addition, thymosins also promote production of antibodies to provide humoral immunity. Thymus is degenerated in old individuals resulting in a decreased production of thymosins. As a result, the immune responses of old persons become weak.
NCERT Page-335 / N-243
Chemical Coordination and Integration (NCERT)
286301
Assertion: Prolactin is also called the 'milk ejection hormone'.
Reason: Oxytocin stimulates the smooth muscle contractions of the mammary glands.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(c) Oxytocin hormone is also known as 'milk ejection hormone' because oxytocin induces contractions of the mammary gland muscles and helps in the flow of stored milk from the mammary glands to the mouth of the suckling infant. Oxytocin contracts the smooth muscles of uterus and mammary glands. Uterine contractions, stimulated by oxytocin at the end of pregnancy, help in child-birth. That is why, it is also called 'birth hormone'. Prolactin or lactogenic hormone or luteotrophic hormone (LTH) is secreted by the anterior pituitary which helps in the growth of mammary glands during pregnancy and initiates the secretion of milk after child-birth.
NCERT Page-333 & 334 / N-241
Chemical Coordination and Integration (NCERT)
286302
Assertion: Oxytocin is called as 'milk-ejection hormone'. Reason: Thymosin acts on the smooth muscles
of our body and stimulates their contraction.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(b) Oxytocin acts on the smooth muscles of our body and stimulates their contraction. In females, it stimulates a vigorous contraction of uterus at the time of child birth, and milk ejection from the mammary gland during suckling.
286298
Assertion :Diabetes insipidus is marked by excessive urination and too much thirst of water.
Reason: Vasopressin (ADH) is released by the posterior lobe of pituitary gland.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(a) Diabetes insipidus (DI) occurs when the kidneys are unable to conserve water. The amount of water conserved is controlled by antidiuretic hormone, ADH, (also called vasopressin) which is secreted by posterior lobe of pituitary gland. Diabetes insipidus is characterised by excessive urination and thirst, due to the increase in permeability of collecting tubules.
NCERT Page-333 & 334 / N-241
Chemical Coordination and Integration (NCERT)
286299
Assertion: Our body secretes adrenaline during emergency. Reason: Adrenaline raises metabolic rate.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(a) Adrenaline secreted from adrenal medulla, is an emergency hormone whose concentration increases under stress conditions, e.g. cold, stress. It initiates many bodily responses, including the stimulation of heart action and an increase in blood pressure, metabolic rate, and blood glucose concentration.
NCERT Page-336 / N-244
Chemical Coordination and Integration (NCERT)
286300
Assertion: Immune response of old persons become weak. Reason: Thymus degenerates in old individuals.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(d) Thymus piays a major role in the development of the immune system. This gland secretes the peptide hormones called thymosins. Thymosins play a major role in the differentiation of T-lymphocytes, which provide cellmediated immunity. In addition, thymosins also promote production of antibodies to provide humoral immunity. Thymus is degenerated in old individuals resulting in a decreased production of thymosins. As a result, the immune responses of old persons become weak.
NCERT Page-335 / N-243
Chemical Coordination and Integration (NCERT)
286301
Assertion: Prolactin is also called the 'milk ejection hormone'.
Reason: Oxytocin stimulates the smooth muscle contractions of the mammary glands.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(c) Oxytocin hormone is also known as 'milk ejection hormone' because oxytocin induces contractions of the mammary gland muscles and helps in the flow of stored milk from the mammary glands to the mouth of the suckling infant. Oxytocin contracts the smooth muscles of uterus and mammary glands. Uterine contractions, stimulated by oxytocin at the end of pregnancy, help in child-birth. That is why, it is also called 'birth hormone'. Prolactin or lactogenic hormone or luteotrophic hormone (LTH) is secreted by the anterior pituitary which helps in the growth of mammary glands during pregnancy and initiates the secretion of milk after child-birth.
NCERT Page-333 & 334 / N-241
Chemical Coordination and Integration (NCERT)
286302
Assertion: Oxytocin is called as 'milk-ejection hormone'. Reason: Thymosin acts on the smooth muscles
of our body and stimulates their contraction.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(b) Oxytocin acts on the smooth muscles of our body and stimulates their contraction. In females, it stimulates a vigorous contraction of uterus at the time of child birth, and milk ejection from the mammary gland during suckling.
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Chemical Coordination and Integration (NCERT)
286298
Assertion :Diabetes insipidus is marked by excessive urination and too much thirst of water.
Reason: Vasopressin (ADH) is released by the posterior lobe of pituitary gland.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(a) Diabetes insipidus (DI) occurs when the kidneys are unable to conserve water. The amount of water conserved is controlled by antidiuretic hormone, ADH, (also called vasopressin) which is secreted by posterior lobe of pituitary gland. Diabetes insipidus is characterised by excessive urination and thirst, due to the increase in permeability of collecting tubules.
NCERT Page-333 & 334 / N-241
Chemical Coordination and Integration (NCERT)
286299
Assertion: Our body secretes adrenaline during emergency. Reason: Adrenaline raises metabolic rate.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(a) Adrenaline secreted from adrenal medulla, is an emergency hormone whose concentration increases under stress conditions, e.g. cold, stress. It initiates many bodily responses, including the stimulation of heart action and an increase in blood pressure, metabolic rate, and blood glucose concentration.
NCERT Page-336 / N-244
Chemical Coordination and Integration (NCERT)
286300
Assertion: Immune response of old persons become weak. Reason: Thymus degenerates in old individuals.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(d) Thymus piays a major role in the development of the immune system. This gland secretes the peptide hormones called thymosins. Thymosins play a major role in the differentiation of T-lymphocytes, which provide cellmediated immunity. In addition, thymosins also promote production of antibodies to provide humoral immunity. Thymus is degenerated in old individuals resulting in a decreased production of thymosins. As a result, the immune responses of old persons become weak.
NCERT Page-335 / N-243
Chemical Coordination and Integration (NCERT)
286301
Assertion: Prolactin is also called the 'milk ejection hormone'.
Reason: Oxytocin stimulates the smooth muscle contractions of the mammary glands.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(c) Oxytocin hormone is also known as 'milk ejection hormone' because oxytocin induces contractions of the mammary gland muscles and helps in the flow of stored milk from the mammary glands to the mouth of the suckling infant. Oxytocin contracts the smooth muscles of uterus and mammary glands. Uterine contractions, stimulated by oxytocin at the end of pregnancy, help in child-birth. That is why, it is also called 'birth hormone'. Prolactin or lactogenic hormone or luteotrophic hormone (LTH) is secreted by the anterior pituitary which helps in the growth of mammary glands during pregnancy and initiates the secretion of milk after child-birth.
NCERT Page-333 & 334 / N-241
Chemical Coordination and Integration (NCERT)
286302
Assertion: Oxytocin is called as 'milk-ejection hormone'. Reason: Thymosin acts on the smooth muscles
of our body and stimulates their contraction.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(b) Oxytocin acts on the smooth muscles of our body and stimulates their contraction. In females, it stimulates a vigorous contraction of uterus at the time of child birth, and milk ejection from the mammary gland during suckling.
286298
Assertion :Diabetes insipidus is marked by excessive urination and too much thirst of water.
Reason: Vasopressin (ADH) is released by the posterior lobe of pituitary gland.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(a) Diabetes insipidus (DI) occurs when the kidneys are unable to conserve water. The amount of water conserved is controlled by antidiuretic hormone, ADH, (also called vasopressin) which is secreted by posterior lobe of pituitary gland. Diabetes insipidus is characterised by excessive urination and thirst, due to the increase in permeability of collecting tubules.
NCERT Page-333 & 334 / N-241
Chemical Coordination and Integration (NCERT)
286299
Assertion: Our body secretes adrenaline during emergency. Reason: Adrenaline raises metabolic rate.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(a) Adrenaline secreted from adrenal medulla, is an emergency hormone whose concentration increases under stress conditions, e.g. cold, stress. It initiates many bodily responses, including the stimulation of heart action and an increase in blood pressure, metabolic rate, and blood glucose concentration.
NCERT Page-336 / N-244
Chemical Coordination and Integration (NCERT)
286300
Assertion: Immune response of old persons become weak. Reason: Thymus degenerates in old individuals.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(d) Thymus piays a major role in the development of the immune system. This gland secretes the peptide hormones called thymosins. Thymosins play a major role in the differentiation of T-lymphocytes, which provide cellmediated immunity. In addition, thymosins also promote production of antibodies to provide humoral immunity. Thymus is degenerated in old individuals resulting in a decreased production of thymosins. As a result, the immune responses of old persons become weak.
NCERT Page-335 / N-243
Chemical Coordination and Integration (NCERT)
286301
Assertion: Prolactin is also called the 'milk ejection hormone'.
Reason: Oxytocin stimulates the smooth muscle contractions of the mammary glands.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(c) Oxytocin hormone is also known as 'milk ejection hormone' because oxytocin induces contractions of the mammary gland muscles and helps in the flow of stored milk from the mammary glands to the mouth of the suckling infant. Oxytocin contracts the smooth muscles of uterus and mammary glands. Uterine contractions, stimulated by oxytocin at the end of pregnancy, help in child-birth. That is why, it is also called 'birth hormone'. Prolactin or lactogenic hormone or luteotrophic hormone (LTH) is secreted by the anterior pituitary which helps in the growth of mammary glands during pregnancy and initiates the secretion of milk after child-birth.
NCERT Page-333 & 334 / N-241
Chemical Coordination and Integration (NCERT)
286302
Assertion: Oxytocin is called as 'milk-ejection hormone'. Reason: Thymosin acts on the smooth muscles
of our body and stimulates their contraction.
1 Both (A) and (R) are correct but (R) is not the correct explanation of$\left( A \right)$
2 (A) is correct but (R) is not correct
3 (A) is not correct but$\left( R \right)$ is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of$\left( A \right)$
Explanation:
(b) Oxytocin acts on the smooth muscles of our body and stimulates their contraction. In females, it stimulates a vigorous contraction of uterus at the time of child birth, and milk ejection from the mammary gland during suckling.