Insekto sidas sur folio dum la radikoj sorbas akvon.

the water

Breakdown of Insekto sidas sur folio dum la radikoj sorbas akvon.

• la: the
• sidi: to sit
• sur: on

Questions & Answers about Insekto sidas sur folio dum la radikoj sorbas akvon.

Why is there no word like an before insekto?

Esperanto has no indefinite article. It has la for the, but nothing for a/an.

So insekto can mean an insect here. The noun appears by itself, without any extra word.

That means:

• insekto = an insect / insect
• la insekto = the insect

English requires a/an in many places, but Esperanto usually just uses the bare noun.

Why is it la radikoj, but not la insekto or la folio?

La is used for something definite or already identifiable.

In this sentence:

• insekto = an insect, not a specific one already known
• folio = a leaf, not a specific leaf already identified
• la radikoj = the roots, meaning specific roots, probably the roots of the plant that the leaf belongs to

So la is not about whether English would always say the mechanically. It is about whether the thing is understood as definite in the context.

You could change the meaning slightly by changing the article:

• Insekto sidas sur folio = An insect is sitting on a leaf
• La insekto sidas sur la folio = The insect is sitting on the leaf