CBSE Class 11 Biology Chemical Coordination And Integration Worksheet

BIOLOGY

ASSIGNMENT NO. 12

CHEMICAL COORDINATION & INTEGRATION

Q1. Define hormone, ductless glands and exocrine glands.

Q2. How are anterior & posterior pituitary regulate the functioning of body? Name the hormones released by hypothalamus.

Q3. Discuss the role of hypothalamus & pituitary as a coordinated unit in maintaining physiological process.

Q4. Name the hormones secreted by the Pituitary gland and write the function of each.

Q5. Enumerate the source & function of each of the following:-

(a) Melatonin (b) Glucocorticoids (c) Anti – diuretic hormone (d) Thyroxin

(d) Oxytocin (f) Parathyroid Hormone (g) Epinephrine

Q6. Describe the physiological functions and disorders of thyroid hormones.

Q7. Draw dorsal & ventral side of thyroid & parathyroid glands.

Q8. Write briefly about the endocrine gland which helps to combat stress.

Q9. Explain the following:-

(a) Insulin lowers blood sugar level.

(b) Adrenal cortex maintains the balance of water and electrolytes in our body. (c)Glucocorticoids are anabolic steroids.

Q10. Explain the role of the following hormones / proteins with reference to control of human male reproductive system:-

(a) GnRH (b) LH (c) Testosterone (d) FSH

Q11. How is the blood pressure reduced by non-endocrine glands in our body?

Q12. Four major peptide hormones are secreted by GI tract. Name the hormones & also mention their function.

Q13. Differentiate between mechanism of action of protein & steroid hormone.

Important Questions for NCERT Class 11 Biology Chemical Coordination and Integration

Ques. Which one of the following statements is correct?
(a) Endocrine glands regulate neural activity, but not vice versa.
(b) Neurons regulate endocrine activity, but not vice versa.
(c) Endocrine glands regulate neural activity and nervous system regulates endocrine glands.
(d) Neither hormones control neural activity nor the neurons control endocrine activity. 

Answer: C

Ques. Presence of which of the following conditions in urine are indicative of diabetes mellitus?
(a) Uremia and Ketonuria
(b) Uremia and Renal Calculi
(c) Ketonuria and Glycosuria
(d) Renal calculi and Hyperglycaemia 

Answer: C

Ques. Match the following columns and select the correct option.
        Column-I               Column-II
(A) Pituitary gland     (i) Grave’s disease
(B) Thyroid gland     (ii) Diabetes mellitus
(C) Adrenal gland    (iii) Diabetes insipidus
(D) Pancreas           (iv) Addison’s disease
(A) (B) (C) (D)
(a) (iv) (iii) (i) (ii)
(b) (iii) (ii) (i) (iv)
(c) (iii) (i) (iv) (ii)
(d) (ii) (i) (iv) (iii) 

Answer: C

Ques. Select the correct statement.
(a) Glucocorticoids stimulate gluconeogenesis.
(b) Glucagon is associated with hypoglycemia.
(c) Insulin acts on pancreatic cells and adipocytes.
(d) Insulin is associated with hyperglycemia.

Answer: A

Ques. Match the following hormones with their respective disease.
(A) Insulin                        (i) Addison’s disease
(B) Thyroxin                    (ii) Diabetes insipidus
(C) Corticoids                (iii) Acromegaly
(D) Growth hormone     (iv) Goitre
                                      (v) Diabetes mellitus
Select the correct option.
(A) (B) (C) (D)
(a) (ii) (iv) (i) (iii)
(b) (v) (i) (ii) (iii)
(c) (ii) (iv) (iii) (i)
(d) (v) (iv) (i) (iii)

Answer: D

Ques. Which of the following hormones can play a significant role in osteoporosis?
(a) Aldosterone and prolactin
(b) Progesterone and aldosterone
(c) Estrogen and parathyroid hormone
(d) Parathyroid hormone and prolactin

Answer: C

Ques. GnRH, a hypothalamic hormone, needed in reproduction, acts on
(a) anterior pituitary gland and stimulates secretion of LH and FSH
(b) posterior pituitary gland and stimulates secretion of oxytocin and FSH
(c) posterior pituitary gland and stimulates secretion of LH and relaxin
(d) anterior pituitary gland and stimulates secretion of LH and oxytocin.

Answer: A

Ques. Hypersecretion of growth hormone in adults does not cause further increase in height, because
(a) epiphyseal plates close after adolescence
(b) bones loose their sensitivity to growth hormone in adults
(c) muscle fibres do not grow in size after birth
(d) growth hormone becomes inactive in adults.

Answer: A

Ques. A temporary endocrine gland in the human body is
(a) corpus cardiacum
(b) corpus luteum
(c) corpus allatum
(d) pineal gland. 

Answer: B

Ques. Graves’ disease is caused due to
(a) hyposecretion of thyroid gland
(b) hypersecretion of thyroid gland
(c) hyposecretion of adrenal gland
(d) hypersecretion of adrenal gland.

Answer: B

Ques. Name a peptide hormone which acts mainly on hepatocytes, adipocytes and enhances cellular glucose uptake and utilisation.
(a) Insulin
(b) Glucagon
(c) Secretin
(d) Gastrin 

Answer: A

Ques. The posterior pituitary gland is not a ‘true’ endocrine gland because
(a) it is provided with a duct
(b) it only stores and releases hormones
(c) it is under the regulation of hypothalamus
(d) it secretes enzymes. 

Answer: B

Ques. Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other?
(a) Aldosterone Atrial Natriuretic Factor
(b) Relaxin Inhibin
(c) Parathormone Calcitonin
(d) Insulin Glucagon 

Answer: B

Ques. Which one of the following hormones is not involved in sugar metabolism?
(a) Insulin
(b) Glucagon
(c) Cortisone
(d) Aldosterone 

Answer: D

Ques. Which one of the following hormones though synthesised elsewhere, is stored and released by the master gland?
(a) Prolactin
(b) Melanocyte stimulating hormone
(c) Antidiuretic hormone
(d) Luteinising hormone

Answer: C

Ques. Fight-or-flight reactions cause activation of
(a) the parathyroid glands, leading to increased metabolic rate
(b) the kidney, leading to suppression of reninangiotensin-aldosterone pathway
(c) the adrenal medulla, leading to increased secretion of epinephrine and norepinephrine
(d) the pancreas leading to a reduction in the blood sugar levels. 

Answer: C

Ques. A pregnant female delivers a baby who suffers from stunted growth, mental retardation, low intelligence quotient and abnormal skin.
This is the result of
(a) cancer of the thyroid gland
(b) oversecretion of pars distalis
(c) deficiency of iodine in diet
(d) low secretion of growth hormone.

Answer: C

Ques. Select the answer which correctly matches the endocrine gland with the hormone it secretes and its function/deficiency symptom.
Endocrine gland         Hormone                   Function/Deficiency symptoms
(a) Thyroid gland         Thyroxine                    Lack of iodine in diet results in goitre
(b) Corpus luteum      Testo- sterone               Stimulates spermatogenesis
(c) Anterior pituitary       Oxytocin                   Stimulates  uterus contraction during child birth
(d) Posterior pituitary  Growth hormone(GH)    Oversecretion stimulates abnormal growth

Answer: A

Ques. Select the option which correctly matches the endocrine gland with its hormone and its function.
Endocrine gland            Hormone              Function
(a) Placenta                  Estrogen       Initiates secretion of the milk
(b) Corpus luteum         Estrogen      Essential for  maintenance of endometrium
(c) Leydig’s cells           Androgen     Initiates the production of sperms
(d) Ovary                         FSH          Stimulates follicular development and the
                                                         secretion of estrogens

Answer: C

Ques. Nor-epinephrine
(i) is released by sympathetic fibers
(ii) is released by parasympathetic fibers
(iii) increases the heart rate
(iv) decreases blood pressure.
Which of the above statements are correct?
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (i) and (iv) 

Answer: A

Ques. Which of the following represents the action of insulin?
(a) Increases blood glucose level by stimulating glucagon production.
(b) Decreases blood glucose levels by forming glycogen.
(c) Increases blood glucose levels by promoting cellular uptake of glucose.
(d) Increases blood glucose levels by hydrolysis of glycogen. 

Answer: B

Ques. A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neurohormonal control system?
(a) Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal medulla.
(b) Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse.
(c) Hypothalamus activates the parasympathetic division of brain.
(d) Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal cortex. 

Answer: A

Ques. The 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone
(a) calcitonin
(b) prolactin
(c) adrenaline
(d) melatonin. 

Answer: D

Ques. Match the source gland with its respective hormone and function and select the correct option.
     Source gland             Hormone                 ​​​​​​​       Function
(a) Anterior pituitary         Oxytocin         Contraction of uterus muscles during child birth
(b) Posterior pituitary       Vasopressin   Stimulates reabsorption of water in the distal tubules in the nephron
(c) Corpus luteum            Estrogen        Supports pregnancy
(d) Thyroid                       Thyroxine       Regulates blood calcium level 

Answer: B

Ques. Given below is an incomplete table on hormones, their source glands and one major effect of each human body. Identify the option representing correct grouping of hormone its gland and effect.
   Gland                           Secretion               Effect on body
    A                                   Estrogen           Maintenance of secondary sexual characters
Alpha cells of Islets of          B                   Raises blood sugar level
Langerhans
Anterior pituitary                  C                   Over secretion leads to gigantism
         A               ​​​​​​​      B                   C
(a) Ovary           Glucagon     Growth hormone
(b) Placenta      Insulin           Vasopressin
(c) Ovary          Insulin           Calcitonin
(d) Placenta     Glucagon      Calcitonin 

Answer: A

Ques. Injury to adrenal cortex is not likely to affect the secretion of which one of the following?
(a) Aldosterone
(b) Both androstenedione and dehydroepiandrosterone
(c) Adrenaline
(d) Cortisol 

Answer: C

Ques. Which one of the following pairs is incorrectly matched?
(a) Glucagon – Beta cells (source)
(b) Somatostatin – Delta cells (source)
(c) Corpus luteum – Relaxin (secretion)
(d) Insulin – Diabetes mellitus (disease) 

Answer: A

Ques. Toxic agents present in food which interfere with thyroxine synthesis lead to the development of
(a) toxic goitre (b) cretinism
(c) simple goitre (d) thyrotoxicosis. 

Answer: C

Ques. Select the correct matching of a hormone, its source and function.
     Hormone                      Source                             Function
(a) Vasopressin            Posterior pituitary      Increases loss of water through urine
(b) Norepine-phrine      Adrenal medulla        Increases heart beat, rate of respiration
                                                                       and alterness
(c) Glucagon                Beta-cells of Islets     Stimulates of glycogenolysis
                                     Langerhans
(d) Prolactin                 Posterior pituitary      Regulates growth of mammary glands and milk
                                                                      formation in females 

Answer: B

Ques. A health disorder that results from the deficiency of thyroxine in adults and characterised by (i) a low metabolic rate, (ii) increase in body weight and (iii) tendency to retain water in tissues is
(a) simple goitre (b) myxoedema
(c) cretinism (d) hypothyroidism.

Answer: B

Ques. Which one of the following pair of organs includes only the endocrine glands?
(a) Thymus and testes
(b) Adrenal and ovary
(c) Parathyroid and adrenal
(d) Pancreas and parathyroid 

Answer: C

Ques. The blood calcium level is lowered by the deficiency of
(a) both calcitonin and parathormone
(b) calcitonin
(c) parathormone
(d) thyroxine. 

Answer: C

Ques. Feeling the tremors of an earthquake a scared resident of seventh floor of a multistoryed building starts climbing down the stairs rapidly. Which hormone initiated this action?
(a) Adrenaline (b) Glucagon
(c) Gastrin (d) Thyroxine 

Answer: A

Ques. A person is having problems with calcium and phosphorus metabolism in his body. Which one of the following glands may not be functioning properly?
(a) Parotid (b) Pancreas
(c) Thyroid (d) Parathyroid 

Answer: D

Ques. Which hormone causes dilation of blood vessels, increased oxygen consumption and glucogenesis?
(a) Glucagon (b) ACTH
(c) Insulin (d) Adrenaline 

Answer: D

Ques. Which of the following is an accumulation and release centre of neurohormones?
(a) Anterior pituitary lobe
(b) Posterior pituitary lobe
(c) Intermediate lobe of the pituitary
(d) Hypothalamus 

Answer: D

Ques. A steroid hormone which regulates glucose metabolism is
(a) cortisone
(b) cortisol
(c) corticosterone
(d) 11-deoxycorticosterone. 

Answer: B

Ques. Which one of the following pairs correctly matches a hormone with a disease resulting from its deficiency?
(a) Luteinising - Failure of ovulation hormone
(b) Insulin - Diabetes insipidus
(c) Thyroxine - Tetany
(d) Parathyroid - Diabetes mellitus hormone 

Answer: A

Ques. Which one of the following pairs correctly matches a hormone with a disease resulting from its deficiency ?
(a) Relaxin – Gigantism
(b) Prolactin – Cretinism
(c) Parathyroid hormone – Tetany
(d) Insulin – Diabetes insipidus 

Answer: C

Ques. Acromegaly is caused by
(a) excess of STH
(b) excess of thyroxine
(c) deficiency of thyroxine
(d) excess of adrenaline. 

Answer: A

Ques. Adrenaline directly affects on
(a) SA node
(b) β-cells of Langerhans
(c) dorsal root of spinal nerve
(d) epithelial cells of stomach.

Answer: A