Label the endocrine glands in Figure 7.3.
Endocrine glands:
a) Pineal gland
b) Pituitary gland
c) Thyroid gland
d) Thymus gland
Pineal gland secretes a hormone called melatonin. It causes the high and low concentration of pigment granules in the melanocyte, which makes the skin colour darker or lighter in certain animals.
Pituitary gland secretes various types of hormones and each hormone has its specific role like antidiuretic or vasopressin hormone decreases the loss of water in the urine by increasing the reabsorption of water in distal convoluted tubule, collecting tubule and collecting ducts.
Thyroid gland secretes three hormones and these hormones control the general metabolism by regulating the rate of oxidation and production of energy.
Thymus gland secretes peptide hormones called thymosins. They accelerate cell division, stimulate the development or differentiation of T- lymphocytes and increase the resistance to infection. Thus provides humoral and cell- mediated immunity.
Find out, from Table 10.3, the medium having highest optical density. Also find the medium with lowest optical density.
| Material medium |
Refractive index |
Material medium |
Refractive index |
| Air | 1.0003 | Canada Balsam |
1.53 |
| Ice | 1.31 | ||
| Water | 1.33 | Rock salt | 1.54 |
| Alcohol | 1.36 | ||
| Kerosene | 1.44 | Carbon disulphide |
1.63 |
| Fused quartz |
1.46 | ||
| Turpentine oil |
1.47 | Ruby | 1.71 |
| Benzene | 1.50 | Sapphire | 1.77 |
| Crown glass |
1.52 | Diamond | 2.42 |
Table 10.3 Absolute refractive index of some material media
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Welcome to the NCERT Solutions for Class 10 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 0 , Question 36: Label the endocrine glands in Figure 7.3.....
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