The anagen phase, or the growth phase, is the first stage of the hair growth cycle. During this phase, hair actively grows as cells in the hair follicle divide rapidly, adding length. It lasts 2–7 years, varying by genetics and body region. Approximately 85–90% of scalp hairs are in this phase at any time. The longer the anagen phase, the longer the hair grows.
Example : Imagine a sprouting plant where the root actively absorbs nutrients, promoting continuous growth upward.
Match Column-I with Column-II and choose the correct option:
| Column-I (Minerals) | Column-II (Features) | ||
|---|---|---|---|
| A. | Copper | (i) | Used in manufacturing of steel and plants |
| B. | Bauxite | (ii) | Used in electric and electronic industries |
| C. | Mica | (iii) | Used in electric cables and utensils |
| D. | Manganese | (iv) | Used in aluminium production |
Choose the correct answer from the options given below:
Give reasons:
(i) The sky appears dark to passengers flying at very high altitudes.
At very high altitudes, passengers are above the atmosphere where there is less scattering of sunlight. As a result, they do not see the scattered blue light and the sky appears dark, similar to the condition experienced by astronauts in space.
(ii) 'Danger' signal lights are red in color.