\n3. Secretions made by these glands are called enzymes.<\/td>\n | Secretions made by these glands are called hormones.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Question 77. \nDefine the terms: hormones, target organs. \nAnswer: \nThe chemical substances secreted by endocrine glands are called hormones. The organs on which hormones act are called target organs.<\/p>\n Question 78. \nWhy are hormones called chemical messengers? \nAnswer: \nHormones are chemical substances, which carry information from one part of the body to the other. Hence they are called chemical messengers.<\/p>\n Question 79. \nDistinguish between hyper secretion and hypo secretion. \nAnswer: \nExcessive secretion of the hormones by an endocrine gland is called hyper secretion and inadequate secretion is called hypo secretion.<\/p>\n Question 80. \nDraw a neat diagram showing the major endocrine glands in the human body. \nAnswer: \n<\/p>\n Question 81. \nWhere is thyroid gland located? Mention the hormone secreted by this gland. \nAnswer: \nThyroid gland is located close to the trachea in the neck. It secretes a hormone called thyroxin.<\/p>\n Question 82. \nName the hormone that is made of iodine and amino acids. \nAnswer: \nThyroxin is the hormone that is made of iodine and amino acids.<\/p>\n <\/p>\n Question 83. \nMention the functions of thyroxin. \nAnswer: \nThyroxin increases the rate of metabolism. It regulates metabolism of carbohydrates, proteins and fats in the body so as to provide the best balance for growth. It increases the production of heat in the body.<\/p>\n Question 84. \nWhat is simple goitre? How is it caused? Can it be cured? How? \nAnswer: \nSimple goitre is a disease condition characterized by swelling in the neck due to the enlargement of the thyroid gland.<\/p>\n Simple goitre is caused by the deficiency of iodine. Yes, goitre can be cured. Administering iodine orally with food and water can cure simple goitre.<\/p>\n Question 85. \nWhere do we find instances of goitre usually? \nAnswer: \nGoitre is an endemic disease. Goitre is usually found in areas where iodine is less in soil and \nwater.<\/p>\n Question 86. \nWhy is goitre called an endemic disease? \nAnswer: \nAny disease that is confined to certain places or regions is called an endemic disease. Goitre is commonly found in hilly regions where there is very little iodine in water. Hence goitre is called an endemic disease.<\/p>\n Question 87. \nWhat is the consequence of low intake of iodine in our diet? \nAnswer: \nLow intake of iodine in our diet may affect the functioning of thyroid gland. The production of thyroxin hormone may be reduced. This will affect the metabolism of carbohydrates, proteins and fats. This may also lead to goitre.<\/p>\n Question 88. \nWhy is the use of iodised salt advisable? \nAnswer: \nIodine is necessary for the thyroid gland to make thyroxin hormone. Thyroxin regulates carbohydrates, proteins and fat metabolism in the body so as to provide the best balance for growth. If iodine is deficient in our diet, there is a possibility that we might suffer from goitre. The thyroid gland enlarges causing swelling in the neck.<\/p>\n Iodised common salt contains proper content of iodine and hence its use contributes to the proper functioning of the thyroid gland. Therefore, the use of iodised salt is recommended.<\/p>\n Question 89. \nWhat is pituitary gland? What hormones does it secrete? \nAnswer: \nA pea-sized endocrine gland located at the base of the brain beneath the hypothalamus in a body cavity at the base of the skull is called pituitary gland. The pituitary gland secretes several hormones like thyroid stimulating hormone, growth hormone, ACTH etc.<\/p>\n <\/p>\n Question 90. \nName the \u2018growth hormone \u2019 secreted by the pituitary gland. Why is it called so? \nAnswer: \nA hormone called STH secreted by pituitary is called the growth hormone. This hormone is called the \u2018growth hormone\u2019 because it influences the rate of both physical and mental growth of the body.<\/p>\n Question 91. \nWhat is gigantism and dwarfism? \nAnswer: \nAbnormal growth causing excessive height due to over-secretion of the growth hormone by the pituitary glands is called gigantism. An abnormally short stature due to the under-secretion of the growth hormone is called dwarfism.<\/p>\n Question 92. \nAn adult has grown to about 7 feet. He has long legs and long arms. His jaws and nose are disproportionately grown. What disease is he suffering from? What is it due to? \nAnswer: \nThe person with the symptoms mentioned above is most likely to be suffering from gigantism. This means the person is unusually tall. Excessive secretion of the growth hormone by the pituitary gland causes this condition.<\/p>\n Question 93. \nWhat are androgens? Name the most common male sex hormone. \nAnswer: \nThe sex hormones secreted by testis are called androgens. The most common male sex hormone is called testosterone.<\/p>\n Question 94. \nMention the function of testosterone. \nAnswer: \nTestosterone is a male sex hormone. It is responsible for the appearance of the secondary sexual characteristics in males. The secondary sexual characteristics such as appearance of beard, moustache and low pitch voice etc., appear at puberty in boys.<\/p>\n Question 95. \nWhat are oestrogens? What is the function of oestrogens? \nAnswer: \nThe female sex hormones produced by the ovaries are called oestrogens. \nOestrogens are responsible for the development of secondary sexual characteristics in females at puberty. These characteristics include feminine voice, soft skin, development of uterus and mammary glands etc.<\/p>\n Question 96. \nWhat is islet of Langerhans? Mention the hormones secreted by it. \nAnswer: \nA small group of cells of the endocrine pancreas are together called islet of Langerhans. The hormones secreted by the islet of Langerhans are insulin and glucagon.<\/p>\n <\/p>\n Question 97. \nWhat is the function of insulin? \nAnswer: \nInsulin promotes the conversion of excess glucose in the blood into glycogen for storage in liver and muscle. This helps to maintain the sugar level in the blood.<\/p>\n Question 98. \nA person aged about 30 years is excreting sugar in urine. What disease does he have? What is the disease due to? \nAnswer: \nThe person is having diabetes mellitus. The disease is due to insufficient production of insulin.<\/p>\n Question 99. \nWhy are some patients of diabetes treated by sivins injections of insulin? \nAnswer: \nDiabetes is a disease condition caused by insufficient production of insulin hormone by the pancreas. Insufficient production of insulin results in raised sugar levels in the blood, which can have serious health consequences in the long run. To avoid complications of diabetes, patients take insulin injections and maintain blood sugar within the desirable range.<\/p>\n Question 100. \nWhat is the treatment for diabetes mellitus? \nAnswer: \nDiabetes mellitus can be controlled by regular physical exercise, diet restrictions, drugs that stimulate the pancreas and utilization of blood glucose. In some chronic diabetic patients the administration of insulin injections becomes necessary to control the blood glucose level.<\/p>\n Question 101. \nA person is subjected to blood glucose test. It is found that the glucose level in the blood had increased beyond normal limits and the person was also complaining of frequent urination,<\/p>\n \n- What disease is the person suffering from?<\/li>\n
- What hormone should be administered to control this disease?<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- The person is suffering from diabetes mellitus.<\/li>\n
- The disease can be controlled by administering insulin.<\/li>\n<\/ol>\n
<\/p>\n Question 102. \nWhat is adrenaline? Mention its functions. \nAnswer: \nAdrenaline is an important hormone secreted by the adrenal gland. Adrenaline is produced in excess at times of fear, anger or any other emotional stress. It helps to prepare the body to face emergency situations. Adrenaline brings about co-ordination of several events like increased heart beat, rate of respiration, dilation of pupils and so on during emergency situations.<\/p>\n Question 103. \nHow does our body respond when adrenaline is secreted into the blood? \nAnswer: \nAdrenal gland secretes adrenaline hormone directly into the blood especially during emergencies. When this happens, heartbeat increases and hence supplies more oxygen to the muscles. This results in increased rate of breathing, and higher blood pressure. This enables the person to fight or face the emergency situation.<\/p>\n Question 104. \nName the following:<\/p>\n \n- The endocrine gland located in the brain that secretes growth hormone.<\/li>\n
- The organ that secretes both digestive enzymes and hormones.<\/li>\n
- The endocrine gland located on the top of kidneys.<\/li>\n
- The endocrine gland that secretes testosterone hormone.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Pituitary gland.<\/li>\n
- Pancreas.<\/li>\n
- Adrenal gland.<\/li>\n
- Testes.<\/li>\n<\/ol>\n
Question 105. \nState the differences between endocrine system and nervous system. \nAnswer:<\/p>\n \n\n\nEndocrine system<\/td>\n | Nervous system<\/td>\n<\/tr>\n | \n1. This system operates through chemical signals.<\/td>\n | This system operates through electrical signals.<\/td>\n<\/tr>\n | \n2. The system consists of a group of glands whose secretions are directly let into the blood stream.<\/td>\n | This system consists of sense organs, brain, spinal cord, nerves, muscles and glands.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n <\/p>\n Question 106. \nCompare and contrast nervous and hormonal mechanisms for control and coordination in \nanimals. \nAnswer:<\/p>\n \n\n\nNervous control<\/td>\n | Hormonal Control<\/td>\n<\/tr>\n | \n1. Nervous system is involved.<\/td>\n | Endocrine glands are involved.<\/td>\n<\/tr>\n | \n2. Messages are transferred in the form of electrical impulses.<\/td>\n | Messages are transferred in the form of chemicals called hormones.<\/td>\n<\/tr>\n | \n3. The response time is very short.<\/td>\n | Here response time is very long.<\/td>\n<\/tr>\n | \n4. Nerve impulses are not specific in their action.<\/td>\n | Each hormone has specific actions on target organs.<\/td>\n<\/tr>\n | \n5. The flow of information is rapid.<\/td>\n | The flow of information is very slow.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Question 107. \nWhy is adrenaline known as emergency hormone? \nAnswer: \nAdrenaline is the hormone secreted at the time of emergency or stress and regulates heartbeat and oxygen level in the body in these conditions. Hence it is known as emergency hormone.<\/p>\n <\/p>\n Fill In The Blanks<\/span><\/p>\n1. The brain and the spinal cord will together constitute the Central Nervous System<\/span> \n2. A nerve cell is called neuron<\/span> \n3. Goitre is caused by the deficiency of iodine<\/span> \n4. The chemical secretions of endocrine glands are called hormones<\/span> \n5. Deficiency of insulin hormone causes diabetes<\/span> \n6. A substance that inhibits growth in plants is abscisic acid<\/span> \n7. The tissue made of an organized network of neurons is nervous tissue<\/span> \n8. The endocrine gland that produces growth hormone is pituitary gland<\/span><\/p>\nMultiple Choice Questions<\/span><\/p>\nQuestion 1. \nWhich of the following is a plant hormone? \n(A) Insulin \n(B) Thyroxin \n(C) Oestrogen \n(D) Cytokinin. \nAnswer: \n(D) Cytokinin.<\/p>\n <\/p>\n Question 2. \nThe gap between two neurons is called a \n(A) dendrite. \n(B) synapse. \n(C) axon. \n(D) impulse. \nAnswer: \n(B) synapse.<\/p>\n Question 3. \nIn a synapse, chemical signal is transmitted from \n(A) axonal end of one neuron to dendritic end of another neuron \n(B) dendritic end of one neuron to axonal end of another neuron \n(C) axon to cell body of the same neuron \n(D) cell body to axonal end of the same neuron \nAnswer: \n(A) axonal end of one neuron to dendritic end of another neuron<\/p>\n Question 4. \nThe brain is responsible for \n(A) thinking. \n(B) regulating heart beat. \n(C) balancing the body. \n(D) all of the above. \nAnswer: \n(D) all of the above.<\/p>\n Question 5. \nThe organ that receives a stimulus from the surroundings is called \n(A) receptor \n(B) effector \n(C) conductor \n(D) axon \nAnswer: \n(A) receptor<\/p>\n <\/p>\n Question 6. \nIn higher order animals, control and coordination is achieved with the help of \n(A) limbs \n(B) nervous system \n(C) endocrine system \n(D) both (B) and (C) \nAnswer: \n(D) both (B) and (C)<\/p>\n Question 7. \nThe central nervous system in human beings consists of \n(A) brain and nerves \n(B) brain and spinal cord \n(C) spinal cord and nerves \n(D) brain, spinal cord and nerves \nAnswer: \n(B) brain and spinal cord<\/p>\n Question 8. \nThe structure that controls reflex action is \n(A) medulla oblongata \n(B) cerebrum \n(C) spinal cord \n(D) cortex \nAnswer: \n(C) spinal cord<\/p>\n Question 9. \nThe bony case that protects the brain is called \n(A) Cranium \n(B) Cerebrum \n(C) Meninges \n(D) Hypothalamus \nAnswer: \n(A) Cranium<\/p>\n <\/p>\n Question 10. \nWhich is not a reflex action? \n(A) Swallowing of food \n(B) Shivering in cold \n(C) Salivation at the sight of food \n(D) Closure of eyes to a flashlight \nAnswer: \n(A) Swallowing of food<\/p>\n Question 11. \nThe growth of the pollen tube towards ovules is an instance of \n(A) phototropism \n(B) geotropism \n(C) chemotropism \n(D) hydrotropism \nAnswer: \n(C) chemotropism<\/p>\n Question 12. \nAfter travelling through the nerve cell, the nerve impulse gets converted to \n(A) chemical signal \n(B) electrical signal \n(C) mechanical signal \n(D) electronic signal \nAnswer: \n(A) chemical signal<\/p>\n Question 13. \nWhich of the following is not an involuntary action? \n(A) Vomiting \n(B) Salivation \n(C) Heart beat \n(D) Chewing \nAnswer: \n(D) Chewing<\/p>\n Question 14. \nThe hormone that triggers the fall of mature leaves and fruits from plants is \n(A) auxin \n(B) abscisic acid \n(C) gibberellins \n(D) cytokinin \nAnswer: \n(B) abscisic acid<\/p>\n <\/p>\n Question 15. \nThe movement of a plant part in the direction of gravity is known as \n(A) Phototropism \n(B) Chemotropism \n(C) Geotropism \n(D) Hydrotropism \nAnswer: \n(C) Geotropism<\/p>\n Question 16. \nOlfactory receptors detect \n(A) smell \n(B) light \n(C) sound \n(D) taste \nAnswer: \n(A) smell<\/p>\n Question 17. \nThe hormone that determines the \u2018fight or flight\u2019 response in our body is \n(A) Thyroxin \n(B) Growth hormone \n(C) Adrenaline \n(D) Insulin \nAnswer: \n(C) Adrenaline<\/p>\n Question 18. \nWhat is the correct direction of flow of electrical impulses? \n \nAnswer: \n<\/p>\n <\/p>\n Question 19. \nThe growth of stem in the upward direction is an example of \n(A) geotropism \n(B) negative hydrotropism \n(C) positive geotropism \n(D) negative geotropism \nAnswer: \n(D) negative geotropism<\/p>\n Question 20. \nThe shape of guard cells changes due to change in the \n(A) protein composition of cells \n(B) temperature of cells \n(C) amount of water in cells \n(D) position of nucleus in the cells \nAnswer: \n(C) amount of water in cells<\/p>\n Question 21. \nIn reflex action, the reflex arc is formed by \n(A) Brain – spinal cord – muscles \n(B) Receptor – spinal cord – effector \n(C) Muscles – receptor – brain \n(D) Effector – spinal cord – receptor \nAnswer: \n(B) Receptor – spinal cord – effector<\/p>\n Question 22. \n22. The incorrect statement about insulin among the following is \n(A) Insufficient secretion of insulin will cause diabetes. \n(B) It is produced from pancreas. \n(C) It regulates blood sugar level. \n(D) It regulates growth and development of the body. \nAnswer: \n(D) It regulates growth and development of the body.<\/p>\n <\/p>\n Question 23. \nWhich pair among the following is mismatched? \n(A) Cerebrum – Memory \n(B) Medulla oblongata – Temperature regulation \n(C) Cerebellum – Posture and equilibrium of the body \n(D) Olfactory lobes – Receive and interpret smell \nAnswer: \n(B) Medulla oblongata – Temperature regulation<\/p>\n Question 24. \nDwarfism is the result of \n(A) excessive secretion of thyroxin \n(B) under-secretion of growth hormone \n(C) under-secretion of adrenaline \n(D) excessive secretion of growth hormone \nAnswer: \n(B) under-secretion of growth hormone<\/p>\n Match The Following<\/span><\/p>\nQuestion 1.<\/p>\n \n\n\nColumn A<\/td>\n | Column B<\/td>\n<\/tr>\n | \n1. Adrenaline<\/td>\n | a. Pituitary gland<\/td>\n<\/tr>\n | \n2. Testosterone<\/td>\n | b. Pancreas<\/td>\n<\/tr>\n | \n3. Thyroxin<\/td>\n | c. Ovary<\/td>\n<\/tr>\n | \n4. Growth hormone<\/td>\n | d. Adrenal gland<\/td>\n<\/tr>\n | \n5. Oestrogen<\/td>\n | e. Tear gland<\/td>\n<\/tr>\n | \n6. Insulin<\/td>\n | f. Thyroid gland<\/td>\n<\/tr>\n | \n<\/td>\n | g. Testes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Answer: \n1 – d, 2 – g, 3 – f, 4 – a, 5 – c, 6 – b.<\/p>\n <\/p>\n Question 2.<\/p>\n \n\n\nColumn A<\/td>\n | Column B<\/td>\n<\/tr>\n | \n1. Auxin<\/td>\n | a. Promotion of cell division<\/td>\n<\/tr>\n | \n2. Gibberellins<\/td>\n | b. Falling of old leaves<\/td>\n<\/tr>\n | \n3. Cytokinin<\/td>\n | c. Growth of stem<\/td>\n<\/tr>\n | \n4. Abscisic acid<\/td>\n | d. Pollination in flowers<\/td>\n<\/tr>\n | \n<\/td>\n | e. Elongation of cells<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Answer: \n1 – e, 2 – c, 3 – a, 4 – b.<\/p>\n Question 3.<\/p>\n \n\n\nColumn A<\/td>\n | Column B<\/td>\n<\/tr>\n | \n1. Carries involuntary quick responses<\/td>\n | a. Peripheral nervous system<\/td>\n<\/tr>\n | \n2. Controls voluntary and conscious thinking<\/td>\n | b. Medulla<\/td>\n<\/tr>\n | \n3. Maintains precision in the voluntary actions and balance of the body<\/td>\n | c. Reflex Arc<\/td>\n<\/tr>\n | \n4. Facilitates communication between central nervous system and other body parts<\/td>\n | d. Dendrite<\/td>\n<\/tr>\n | \n<\/td>\n | e. Axon<\/td>\n<\/tr>\n | \n<\/td>\n | f. Cerebellum<\/td>\n<\/tr>\n | \n<\/td>\n | g. Fore brain<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Answer: \n1 – b, 2 – g, 3 – f, 4 – a.<\/p>\n","protected":false},"excerpt":{"rendered":" Students can download Class 10 Science Chapter 7 Control and Coordination Important Questions, KSEEB SSLC Class 10 Science Important Questions and Answers helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations. Karnataka SSLC Class 10 Science Important Questions Chapter 7 Control and Coordination Question 1. What is …<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/26990"}],"collection":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/comments?post=26990"}],"version-history":[{"count":0,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/26990\/revisions"}],"wp:attachment":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/media?parent=26990"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/categories?post=26990"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/tags?post=26990"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}} | | | | | |