In the figure given below mark the positions of the endocrine glands which release the hormones that a. Controls the release of sex hormones. b. Is responsible for the secondary sexual characters in boys. c. Prevents diabetes. d. Maintains the correct salt balance in the blood.
Question
In the figure given below mark the positions of the endocrine glands which release the hormones that a. Controls the release of sex hormones. b. Is responsible for the secondary sexual characters in boys. c. Prevents diabetes. d. Maintains the correct salt balance in the blood.
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Observe the given chart and graph carefully and answer the questions that follow. (i) Which of the line represents the height of boys? (ii) Which line represents the height of girls? (iii) What is the difference between the pattern of increase in the height of boys and girls? (iv) Is this pattern true for each individual?
| Age in years | % of full height | |
| Boys | Girls | |
| 8 | 72% | 77% |
| 9 | 75% | 81% |
| 10 | 78% | 84% |
| 11 | 81% | 88% |
| 12 | 84% | 91% |
| 13 | 88% | 95% |
| 14 | 92% | 98% |
| 15 | 95% | 99% |
| 16 | 98% | 99.5% |
| 17 | 99% | 100% |
| 18 | 100% | 100% |
Open Answer » John and Radha were classmates since childhood. When Radha became eleven years old, she developed a little swelling on her neck. She visited the doctor who started medication for her. After a few years, John also developed a slight protrusion on his throat. He got worried and went to the doctor. But, the doctor assured him that it was a normal feature in boys while they are growing up. Can you think of any reasons for the difference in diagnosis?
Open Answer »Given below are certain food items required for proper nourishment of adolescents. Name the nutrients present in the food items and write their functions.
| Food items | Major nutrient | Functions | |
| 1. | Pulses and nuts | ||
| 2. | Oranges and amla | ||
| 3. | sugar, roti | ||
| 4. | oils | ||
| 5. | Vegetables |
During adolescence, the body of boys and girls undergoes certain changes. Given below are a few of those changes. a. Broad shoulders b. Wider chests c. Wider region below waist d. Growth of muscles e. Development of mammary glands f. Growth of facial hair g. Acne and pimples on face h. Development of sex organs i. High-pitched voice j. Growth of pubic hair Categorise these changes into those that occur in boys and those that occur in girls.
Open Answer »Give a suitable word for each of the following statements. [NCERT Exemplar] (i) The site which responds to a hormone (ii) Name of a gland which transports secretions through ducts (iii) Chemicals which control changes at adolescence stage (iv) It marks the beginning of reproductive period
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