Yes it can!
Laying hens dont have as good eggs when they are keeped in the dark.
YES,
Red-Eyes Darkness Metal Dragon's effect is an Ignition Effect so cannot be chained to anything.
No, Patrician of Darkness' effect is continuous, and ceases to apply the moment he is no longer face-up on the field.
Worms do not have eyes. Darkness has no effect on them.
In theory, yes. Light and Darkness Dragon's negation effect does not target, it could potentially be chained to Blue-Eyes Shining Dragon's Quick Effect. However becase Light and Darkness Dragon's effect is mandatory, in practice it will actually chain to the initial targeting effect, the one Blue-Eyes Shining Dragon was going to use its effect against.
When chicks are in their eggs, you can see an embryo of the chick when holding a flash light or any other lighting object up to the egg in darkness; when it is dark, it is easier to see the egg. This is what chickens have to do with embryology.
YES
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The short answer is, it increases melatonin production which causes sleepiness.
Of course you can. Interbreeding has no effect on the egg as a food source.
You can only activate and Special Summon "Red Eyes Darkness Metal Dragon" with this effect from your hand.
Light and Darkness Dragon's first line of text says that it cannot be special summoned. Therefore when it is destroyed and its last effect triggers, it cannot choose itself.