Important Questions for Class 11 Biology 22nd Chapter Chemical Coordination and Integration MCQ, Very Short, Short Type, Long Type
CBSE Class 11 Important Questions for Class 11 Biology Chapter 22 Chemical Coordination and Integration all MCQ Type, Very Short Type, Assertion Reason Type, Case Study, Short Type and Long Type Questions with Answers by Expert. Important Questions for Section A, B, C, D Class 11 Biology Chapter 22.
- MCQs
1.) Assertion: The hormone Gonadotrophin releasing hormone (GnRH) stimulates the synthesis and release of gonadotrophins
Reason: The hormone Gonadotrophin is produced by pituitary gland
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) If both assertion and reason are false.
2.) Pars intermedia of the pituitary gland secretes hormone called
a) adrenocorticotrophic hormone (ACTH)
b) luteinizing hormone (LH) and
c) follicle stimulating hormone (FSH)
d) melanocyte stimulating hormone (MSH)
3) Diabetes Insipidus is caused due to an impairment affecting synthesis or release of
a) Oxytocin
b) Vasopressin
c) Prolactin
d) luteinizing hormone
4) Assertion: Androgens act on the central neural system and influence the male sexual behaviors.
Reason: These hormones produce anabolic (synthetic) effects on protein and carbohydrate metabolism.
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) If both assertion and reason are false.
5) Assertion: Adrenaline and noradrenaline are rapidly secreted in response to stress of any kind and during emergency situations
Reason: due to this reason called emergency hormones or hormones of Fight or Flight.
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) If both assertion and reason are false.
6) Aldosterone helps in the maintenance of all except
a) electrolytes,
b) body fluid volume,
c) osmotic and blood pressure
d) gluconeogenesis
7) The Leydig cells produce_________
a) Testosterone
b) estrogen
c) progesterone
d) None of the above
8) Assertion: Hormones with membrane-bound receptors normally do not enter the target cell.
Reason: these hormones regulate cellular metabolism by production of secondary messengers
a.) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b.) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
c.) If assertion is true but the reason is false.
d.) If both assertion and reason are false.
9) The atrial wall of the heart produces ___________hormone, which decreases the blood pressure
a) atrial natriuretic factor
b) erythropoietin
c) secretin
d) gastrin
10.) Parathyroid hormone (PTH) increases the blood ______________levels
a) glucose
b) iodine
c) Ca2+
d) serum proteins
- Answer in one sentence
Q.1) What are Hormones?
Ans. Hormones are non-nutrient molecules produced in trace amounts that operate as messengers of cell in an organism.
Q.2) Give examples of organized endocrine glands in humans.
Ans. The examples of organized endocrine bodies in human body are the pituitary, pineal, thyroid, adrenal, pancreas, parathyroid, thymus, and gonads (testis in males and ovary in females).
Q.3) What are the types of hormones released by the hypothalamus?
Ans. the two types of hormones released by the hypothalamus are the releasing hormones and the inhibiting hormones.
Q.4) What is the function of oxytocin?
Ans. Oxytocin operates on our body’s smooth muscles, causing the uterus to contract vigrously during childbirth and milk ejection from the mammary gland.
Q.5) Explain the symptoms of Graves’ disease.
Ans. Exopthalmic goiter, often known as Graves’ disease, is a kind of hyperthyroidism marked by enlargement of the thyroid gland, protrusion of the eyes, elevated basal metabolic rate, and weight loss.
Q.6) What is the cause of Addison’s disease?
Ans. The adrenal cortex’s underproduction of hormones changes glucose metabolism, resulting in acute weakness and exhaustion, resulting in Addison’s disease.
- Answer in short
Q.1) Explain the functioning of the hormones of the hypothalamus?
Ans. 1.) The hormones originate in hypothalamic neurons and travel along axons to their nerve terminals, where they are released.
2) These hormones enter the pituitary gland via the portal circulatory system and govern the anterior pituitary’s functions.
3) The hypothalamus controls the posterior pituitary by direct neural regulation.
Q.2) Short note: 1.) pineal gland.
Ans.1.) On the dorsal side of the forebrain is the pineal gland, which secretes a hormone called Melatonin.
2.) Melatonin is essential for our body’s 24-hour (diurnal) rhythm to function properly.
3.) It aids in the maintenance of appropriate sleep-wake cycles and body temperatures.
4.) Melatonin also affects metabolism, pigmentation, the menstrual cycle, and our ability to defend ourselves.
Q.3) Glucagon is a hyperglycemic hormone. Justify
Ans. 1.) Glucagon is a peptide hormone that is responsible for maintaining normal blood glucose levels.
2.) Glucagon increases glycogenolysis in hepatocytes, resulting in an increase in blood sugar.
3.) This hormone promotes gluconeogenesis, a process that contributes to hyperglycemia.
4.) hence it is called hyperglycemic hormone.
Q.4) Describe the structure of the pituitary gland.
Ans. 1.) The pituitary gland is housed in the sellatursica, a bone cavity connected to the hypothalamus by a stalk.
2.) An adenohypophysis and a neurohypophysis are anatomically separated.
3.) Pars distalis and pars intermedia are the two parts of the adenohypophysis.
4.) In humans, however, the pars intermedia is nearly fused with the pars distalis.
5.) The neurohypophysis (pars nervosa), also known as the posterior pituitary, stores and releases the chemicals oxytocin and vasopressin, which are produced in the hypothalamus and transported axonally to the neurohypophysis.
- Answer in brief
Q.1) Describe the function of hormones secreted by gastro-intestinal tract.
Ans. 1.) Gastrin, secretin, cholecystokinin (CCK), and gastric inhibitory peptide are four primary peptide hormones secreted by endocrine cells in various sections of the gastro-intestinal tract (GIP).
2.) Gastrin promotes the secretion of hydrochloric acid and pepsinogen by acting on the stomach glands.
3.) Secretin promotes the secretion of water and bicarbonate ions by the exocrine pancreas.
4.) CCK promotes the release of pancreatic enzymes and bile juice in the pancreas and gall bladder, respectively.
5.) Gastric secretion and motility are both inhibited by gastric inhibitory peptide (GIP).
6.) Growth factors are hormones secreted by a variety of non-endocrine tissues.
7.) These elements are required for tissue growth and repair/regeneration to occur normally.
Q.2) State the classification of hormones. give examples
Ans. 1.) Hormones are categorized into following types based on their chemical nature:
i) peptide, polypeptide, and protein hormones (e.g., insulin, glucagon, pituitary hormones, hypothalamus hormones, and so on).
ii) anabolic steroids (e.g., cortisol, testosterone, estradiol and progesterone)
iii) iodothyronines (thyroid hormones)
iv) derivatives of amino acids (e.g., epinephrine).