FOUR RHYMING RIDDLES

1)
With food we do not deal,
Yet we can make a meal;
And without us, my friend,
Your life would surely end.

2)
A simple click, a simple flash -
For a lifetime I may last.

3)
A seed am I,
Three letters spell my name;
Take away two
And I still sound the same.

4)
You lift me up,
I hold you down;
You seek the sea,
I seek the ground

HINT:
4. Not all ground is dry ground.

Answers:

1. Plants
2. A photograph
3. Pea 
4. Anchor