Melanin

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In the chemistry of vision in mammals, the photosensitive substance is called or The visual pigment in rods of retina of vertebrate eye which is responsible for detection of light is or It is present in rods and useful in night vision (a) Rhodopsin (b) Vitamin C (c) Melanin (d) Vitamin K

Read the following statements carefully ( A - D ) : A . Thymosin hormone helps T -lymphocytes to provide cell-mediated immunity . B. Calcitonin ormone increases blood calcium level and is hypercalcemic. C. Melanin hormones from the pineal gland, regulate the 24 hours (diurnal ) rhythm cycle. D. Epinephrine and norepinephrine hormones are called catecholamines. How many statements /s from above is /are correct ?

Human skin colour is polygenic trait with each dominant determing a part of melanin deposition while the recessive are coding for no melanin. If a very dark skinned person marries a very light skinned women, the chances of a very dark skinned offspring are

Assertion: Overexposure to sun tans the skin in human beings. Reason: In epidermal cells, melanin appears and saves the skin from UV rays of the sun a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion. b) If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. c) If Assertion is true but the Reason is false. d) If both Assertion and Reason are false.

Correct the following statements by changing the underlined words: (i) Normal pale yellow colour of the urine is due to the presence of the pigment Melanin. (ii) The outermost layer of meninges is Piamater. (iii) The cell sap of root hairs is Hypotonic. (iv) Xylem transports starch from the leaves to all parts of the plant body. (v) Nitrogen bonds are present between the complementary nitrogen bases of DNA.

Mathc Column I with column II and select the correct option from the codes given below. {:("Column I","Column II"),("Testis",(i)"Pigmentation"),("Ovaries",(ii)"Atrosphies in adult"),("Thymus",(iii)"Estrogen"),("Melanin",(iv)"Testosterone"):}