Can you solve the photo plexer logic ?

Why is it very easy to weigh a fish?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

I have branches, but no fruit, trunk or leaves. What am I?

A father's child, a mother's child, yet no one's son.

Who am I?

Forwards I am heavy, backward I am not. What am I?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Can you name an animal whose killing cannot be performed without spilling your own blood?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

During a secret mission, an agent gave the following code to the higher authorities
AIM DUE OAT TIE MOD

However, the information is in one word only and the rest are fake. To assist the authorities in understanding better, he also sent them a clue, If I tell you any one character of the code, you can easily find out the number of vowels in the codeword.

Can you find out the code word?