В этом тексте одно слово берётся в кавычки.

Because в can mean either in or into, depending on the case.

• в этом тексте uses the prepositional case and means in this text
• в этот текст would use the accusative case and would mean into this text

Here the sentence is describing where something happens, not motion into something, so Russian uses the prepositional: в этом тексте.

Этом is the prepositional singular form of этот (this).

It agrees with тексте, which is:

• masculine
• singular
• prepositional

So:

• nominative: этот текст = this text
• prepositional: в этом тексте = in this text

Russian adjectives and demonstratives change form to match the noun they describe.

Because слово is a neuter noun, and один (one) has to agree with it.

So:

• masculine: один
• feminine: одна
• neuter: одно

That gives:

• одно слово = one word

This can mean literally one word, but in context it can also feel like a single word.

Because слово is the grammatical subject of the sentence.

The structure is basically:

• одно слово = the thing being talked about
• берётся в кавычки = is put in quotation marks / is enclosed in quotation marks

Even though English often prefers a passive translation, in Russian одно слово is still in the nominative because it is the subject of берётся.

Yes, брать usually means to take, but in this expression it works idiomatically.

браться в кавычки means something like:

• to be put in quotation marks
• to be enclosed in quotation marks
• sometimes more literally, to get taken into quotation marks

So the basic verb is still брать, but the full expression has a specialized meaning.

Also note that берётся is:

• 3rd person singular
• present tense
• imperfective
• reflexive

The -ся makes the verb reflexive, and in many cases reflexive verbs are used where English would use a passive construction.

So:

• берёт = takes
• берётся = literally something like takes itself, but in real usage often is taken or gets taken

In this sentence, берётся в кавычки is best understood as a passive-like expression:

• is put in quotation marks
• is enclosed in quotation marks

This is very common in Russian: reflexive verbs often do work that English handles with is done, gets done, and so on.

Because Russian treats this as movement into a state or container-like idea.

Compare:

• в кавычках = in quotation marks as a location/state
• в кавычки = into quotation marks, meaning the word gets placed there

The expression брать / взять в кавычки normally uses the accusative:

• в кавычки

So even though English just says in quotation marks, Russian conceptualizes it more like put into quotation marks.

Because Russian normally uses кавычки as a plural noun when talking about quotation marks.

That makes sense conceptually too, since quotation marks usually come as a pair.

So:

• кавычки = quotation marks

In this sentence:

• в кавычки = in/into quotation marks

Because Russian often uses the present tense for general rules, habits, and descriptions of what is normally done.

So одно слово берётся в кавычки means something like:

• one word is put in quotation marks
• one word gets quotation marks
• one word is enclosed in quotation marks

This is not necessarily happening right now; it can simply describe what the text does in general.

Yes. They are the same word.

• берётся is the version with ё
• берется is the version where ё is written as е

In printed Russian, ё is often omitted, but the pronunciation and stress are still the same:

• берётся

For learners, writing ё is very helpful because it shows both the correct vowel and the stress.

Yes. Russian word order is flexible, though the original sounds natural and neutral:

В этом тексте одно слово берётся в кавычки.

Other orders are possible, for example:

• Одно слово в этом тексте берётся в кавычки.
• В кавычки в этом тексте берётся одно слово.

But these may shift the emphasis.

The original version starts with в этом тексте, which sets the context first: in this text. Then it says what happens there: one word is put in quotation marks. That is a very normal information flow in Russian.