Endocrine System Class 10 Concise Structured / Applications Answer ICSE Biology Selina Solutions Ch-12. In this article you will get the solutions of Structured / Applications / Skill Type Questions with figure. Visit official website CISCE for detail information about ICSE Board Class-10 Biology.
Endocrine System Class 10 Concise Structured / Applications Answer ICSE Biology Selina Solutions Ch-12
| Board | ICSE |
| Subject | Biology |
| Class | 10 |
| Book | Selina Concise |
| Chapter-12 | Endocrine System |
| Topics | Solutions of Structured / Applications / Skill Type Questions |
Structured / Applications / Skill Type Questions on Endocrine System
Page 164-165
Que-1: Study the diagram given below and then answer the questions that follow:
(a) Name the cells of the pancreas that produce (1) glucagon (2) insulin.
(b) State the main function of (1) glucagon and (2) insulin.
(c) Why is the pancreas referred to as an exo-endocrine gland?
(d) Why is insulin not given orally but is injected into the body?
(e) What is the technical term for the cells of the pancreas that produce endocrine hormones?
(f) Where in the body is the pancreas located?
Ans:
(a) Glucagon: Alpha cells of the islets of Langerhans
Insulin: Beta cells of the islets of Langerhan
(b) Insulin: It maintains the levels of glucose (sugar) in the blood.
Glucagon: It raises the blood glucose levels by stimulating the breakdown of glycogen to glucose in the liver.
(c) An endocrine gland is one which does not pour its secretions into a duct, while an exocrine gland is a gland which pours its secretions into a duct. Because the pancreas produces hormones such as insulin, glucagon and somatostatin directly into the blood and not into a duct, it functions as an endocrine gland. Because it secretes the pancreatic juices for digestion via a duct, it functions as an exocrine gland. Hence, the pancreas is an exo-endocrine gland.
(d) Insulin is not administered orally because the digestive juices degrade insulin, and thus the insulin is ineffective in the body.
(e) Islets of Langerhans
(f) The pancreas is located in the abdomen behind the stomach.
Que-2: Given below is a portion from the human body showing some important structure in ventral (front) view.
(a) Where is this portion located in the body?
(b) Name the structures numbered 1-3.
(c) State one main function of each of the structures named above.
(d) Is there any duct to carry the secretions from the structure numbered 2 ? If so, give its name.
Ans:
(a) This portion is located in the neck region above the sternum.
(b) 1- Larynx, 2 – Thyroid gland, 3 – Trachea
(c) Larynx is the voice box containing vocal cords. It helps in producing sound.
Thyroid gland produces thyroxine and calcitonin which are essential hormones.
Trachea is the wind pipe that helps in passing air to and from the respiratory system while breathing.
(d) Structure 2 is the thyroid gland. It is an endocrine gland, so it is ductless and pours its secretions directly into the blood. Hence, there is no duct.
Que-3: Given below is an outline diagram of human body showing position of certain organs.
(a) Name the parts numbered 1 to 4.
(b) What is common to all these parts in regard to the nature of their functions?
(c) Name the nutrient element which is essential for the normal working of part 2.
Ans:
(a) 1- Pituitary gland, 2 – thyroid gland, 3 – pancreas, 4 – adrenal glands
(b) All the glands shown in the above diagram are endocrine glands. They secrete essential hormones and pour their secretions directly into the blood.
(c) Iodine is essential for the normal working of thyroxine.
Que-4: The diagram given alongside shows an endocrine gland in the human body. Study the diagram and answer the following questions :
(a) Identify the gland. Write its specific location in the human body.
(b) Label the guidelines 1, 2 and 3 shown in the figure.
(c) Name any two secretions from part 1 and two from part 2.
(d) The deficiency of which hormone causes Diabetes insipidus? How is this condition different from Diabetes mellitus with respect to the abnormal substances present in the urine.
Ans:
(a) The gland shown is Pituitary gland. It hangs from the base of the mid-brain below the hypothalamus.
(b)
- 1 – Anterior lobe
- 2 – Posterior lobe
- 3 – Hypophysial stalk
(c) Two secretions from part 1 are Growth hormone and Thyroid Stimulating Hormone.
Two secretions from part 2 are ADH and Oxytocin
(d) The deficiency of ADH causes Diabetes insipidus. Urine does not contain any glucose in this condition but in Diabetes mellitus there is glucose present in the urine.
Que-5: Human height is mainly controlled by genetic factors but hormonal secretion is also equally important in regulating the height. Study the figures given below and answer the questions that follow :
(a) Which of the above figures (A/B/C) is suffering from hyposecretion of the growth hormone?
(b) Name the disorder shown in figure A.(c) Mention the gland which secretes ‘Growth Hormone’.
Ans:
(a) C
(b) Gigantism
(c) Anterior lobe of pitutary gland
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