Pe măsură ce răsadul răsare, tulpina devine verde.

It means as, as/while, or gradually as.

In this sentence, pe măsură ce răsadul răsare means something like:

• As the seedling sprouts
• As the seedling comes up
• As the seedling is emerging

It is a fixed expression used to show that one process happens progressively alongside another.

A helpful way to remember it is:

• pe măsură ce X happens, Y happens too

So here:

• the more / as the seedling sprouts,
• the stem becomes green

Because răsadul means the seedling, while răsad means a seedling or just seedling.

Romanian usually adds the definite article to the end of the noun instead of putting a separate word before it.

So:

• răsad = seedling
• răsadul = the seedling

The ending -ul is the definite article for this noun.

For the same reason: tulpina means the stem, while tulpină means stem.

So:

• tulpină = stem
• tulpina = the stem

Here, the final -a is the definite article attached to a feminine noun.

This is very common in Romanian:

• floare → floarea = the flower
• casă → casa = the house
• tulpină → tulpina = the stem

Because Romanian usually has a postposed definite article: the article is attached to the end of the noun.

Compare English and Romanian:

• the seedling → răsadul
• the stem → tulpina

This is one of the big differences between Romanian and English.

There is no separate word like English the in these examples. Instead, the noun changes form.

Răsare is the 3rd person singular present tense of the verb a răsări.

So:

• a răsări = to sprout, to emerge, to come up
• răsare = sprouts / is sprouting / comes up

Because the subject is răsadul (the seedling), Romanian uses the 3rd person singular form.

Very roughly:

• răsadul răsare = the seedling sprouts

Devine is the 3rd person singular present tense of a deveni = to become.

So:

• a deveni = to become
• devine = becomes / is becoming

Since the subject is tulpina (the stem), which is singular, the verb is also singular:

• tulpina devine verde = the stem becomes green

Because Romanian often uses the present tense for:

• general truths
• natural processes
• descriptions of how something happens

This sentence describes a biological process, so the present tense sounds natural.

In English, depending on context, you might translate it as:

• As the seedling sprouts, the stem becomes green.
• As the seedling is sprouting, the stem turns green.

Romanian present tense can often cover both a simple present and a progressive idea, depending on context.

Yes, they are related in meaning and sound.

• răsad = seedling / seedling plant
• a răsări = to sprout, emerge

They come from the same general idea of coming up / growing up from the ground.

So the repetition is not accidental. It is quite natural semantically:

• the seedling is the thing that sprouts

For a learner, this is useful because related words often help build vocabulary faster.

Verde is an adjective meaning green, and here it is used after devine in a predicate structure:

• tulpina devine verde = the stem becomes green

Romanian adjectives do agree with the noun, but in this case the singular masculine and feminine form is simply verde, so you do not see an extra ending.

Compare:

• tulpina este verde = the stem is green
• frunza este verde = the leaf is green
• frunzele sunt verzi = the leaves are green

Notice that the plural changes to verzi, but the singular stays verde.

Yes. Romanian word order is fairly flexible, although some orders sound more neutral than others.

The given sentence:

• Pe măsură ce răsadul răsare, tulpina devine verde.

is a very natural, neutral way to say it.

You could also say:

• Tulpina devine verde pe măsură ce răsadul răsare.

That still means essentially the same thing:

• The stem becomes green as the seedling sprouts.

The difference is mostly about emphasis and style, not basic meaning.

Sometimes, but not with exactly the same nuance.

• în timp ce usually means while
• pe măsură ce means as, gradually as, in step with

So:

• în timp ce răsadul răsare... = while the seedling sprouts...
• pe măsură ce răsadul răsare... = as the seedling sprouts / as it gradually emerges...

In this sentence, pe măsură ce is better because it emphasizes a gradual change happening alongside another gradual process.

A rough English-friendly guide is:

• răsadul ≈ ruh-SAH-dool
• răsare ≈ ruh-SAH-reh

A few pronunciation notes:

• ă is a short central vowel, somewhat like the a in about
• r is usually trilled or tapped
• s is always like English s in see, never like z
• the stress is typically on sa here: ră-SA-dul, ră-SA-re

You do not need perfect pronunciation immediately, but getting used to ă is very important in Romanian.

Because Romanian often does not need subject pronouns when the subject is already clear.

Here, the nouns themselves are stated:

• răsadul răsare
• tulpina devine verde

So there is no need to add a pronoun like el/ea (he/she/it).

Romanian commonly leaves pronouns out unless they are needed for emphasis or contrast.

Grammatically, the forms are definite:

• răsadul = the seedling
• tulpina = the stem

But Romanian often uses the definite form when speaking about something in a general, class-level, or descriptive way, especially in explanatory or scientific-style statements.

So depending on context, this can sound like:

• a description of one specific seedling
• or a general statement about how a seedling develops

English often uses either:

• the seedling / the stem
• or more general wording like a seedling / its stem

So the Romanian definite article does not always mean a uniquely identified object in the same strict way English does.