Physics
The locomotion of insects to the source of light is called :

Phototactic
Thermotactic
Hydrotropic
Phototropic

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Physics
Why does the sea appear blue in colour?

Scattering of the sunlight by water molecules
Reflection of the sun light from water surface
Refraction of the sun light
Interference of the sun light from water surface

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Physics
The sky appears blue because

It is actually blue
In white light, the blue component dominates
All colours interfere to produce blue
The atmosphere scatters blue colour more than the others

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