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Q. Our skin, when exposed to excess sunlight, becomes dark. This is because of our skin pigments called
Within the skin's epidermal (outer) layer are cells that contain the pigment melanin. Suntanning occurs because exposure to sunlight causes the skin to produce more melanin and to darken. The tan fades as these cells move toward the surface and are sloughed off.
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Q. Amino acids are required for the synthesis of:
Q. The elastic vessels which transport blood to the heart is known as
Q. Which among the given vitamins are water soluble -
Q. Which blood group is universal donor?
Q. In old age stiffness of joints is due to the
Q. What is the straight tube, about 40 cm long, that carries sperms to the seminal vesicles, called?
Q. The radioactive element most commonly detected in humans is
Q. Which of the following serves as the main source of carbon for plants?
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