7th Grade Writing Quiz: Establish Maintain A Formal Explanatory Style

What this quiz covers

This quiz focuses on Establish Maintain A Formal Explanatory Style, giving you a quick way to practice the rules, question types, and explanations that matter most for 7th Grade Writing.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

Question 1

1. Now here's something else you should know: a green pigment called chlorophyll captures the light energy needed for this reaction.
2. Additionally, a green pigment called chlorophyll captures the light energy needed for this reaction. (correct answer)
3. Also, you'll want to remember that a green pigment called chlorophyll grabs the light energy needed for this reaction.
4. In addition, a green pigment known as chlorophyll pretty much handles the light energy that gets used for this reaction.

Explanation: For a science newsletter written for adults, the underlined sentence should give clear, objective information in a formal tone, not chat with the reader. The best revision begins with "Additionally" and states the fact directly: "Additionally, a green pigment called chlorophyll captures the light energy needed for this reaction." "Additionally" is a smooth, formal transition, and the sentence keeps the exact meaning while sounding objective, like the sentences around it. The option that opens "Now here's something else you should know" speaks straight to the reader and uses a casual, announcing tone that clashes with the formal style of the paragraph. The choice with "you'll want to remember" also addresses the reader personally, and "grabs" is a slangy verb that is too informal for describing a scientific process. The revision saying chlorophyll "pretty much handles the light energy" sounds too casual ("pretty much," "handles") and also loosens the precise meaning—chlorophyll specifically captures light energy, so "handles" is vaguer than the original. Study tip: In formal-style questions, cut choices that talk directly to the reader ("you") or use loose, everyday verbs like "grabs" or "handles." The best answer states the idea neutrally and precisely.

Question 2

1. When people get sick, their immune systems send white blood cells to fight the infection. (correct answer)
2. If you happen to get sick, you'll notice your immune system sending white blood cells to fight infection.
3. Getting sick is scary, but don't worry because your immune system will help you.
4. One's immune system, upon detecting illness, dispatches white blood cells in a heroic battle against infection.

Explanation: When you're writing to explain or inform, one of the key skills is choosing the right point of view. The word "you" is second-person address, and it makes writing feel casual—like you're talking directly to a reader. In formal explanatory writing, you usually shift to third person, using words like "people," "one," or the subject itself, to sound more objective and academic. The revision "When people get sick, their immune systems send white blood cells to fight the infection" does exactly this. It swaps "you/your" for "people/their," which removes the informal address while keeping the sentence clear and factual. The tone stays neutral and explanatory—perfect for a science paragraph. The version "If you happen to get sick, you'll notice your immune system sending white blood cells..." fails because it keeps "you" and "your," so the informal second-person address is still there. "Getting sick is scary, but don't worry because your immune system will help you" is worse—it also uses "you," adds emotional language ("scary," "don't worry"), and sounds like a pep talk rather than an explanation. The choice "One's immune system, upon detecting illness, dispatches white blood cells in a heroic battle against infection" does remove "you," but "heroic battle" is dramatic, figurative language that breaks the neutral, formal tone you want in an explanation. A helpful tip: when a question asks you to make writing formal, scan first for "you" and "your," then check that the replacement stays neutral—not overly emotional or dramatic. The best answer fixes the point of view without adding flashy language.

Question 3

1. Poaching is honestly a huge problem for elephants everywhere.
2. Poaching has completely wiped out elephant populations across the globe.
3. Poaching has caused elephant populations to drop pretty quickly in some regions.
4. Poaching has caused elephant populations to decline rapidly in some regions. (correct answer)

Explanation: Whenever a question asks you to revise for a "formal explanatory style," you're being tested on two things at once: keeping the meaning the same and upgrading casual language into precise, academic wording. The trap is choosing an answer that fixes the tone but accidentally changes what the sentence says—or vice versa. The original sentence uses "pretty fast," which is informal and vague. Replacing it with "decline rapidly" in "Poaching has caused elephant populations to decline rapidly in some regions" keeps the exact meaning (populations dropping quickly in certain areas) while swapping casual phrasing for precise, formal vocabulary. That's the balance the question wants. The version reading "Poaching is honestly a huge problem for elephants everywhere" fails on both counts: "honestly" and "huge problem" are conversational, and "everywhere" overstates the original's "some regions." The choice "Poaching has completely wiped out elephant populations across the globe" changes the meaning entirely—"dropped fast" is not the same as "completely wiped out," and "across the globe" contradicts "some regions." The option "Poaching has caused elephant populations to drop pretty quickly in some regions" only swaps one weak word ("fast" to "quickly") but keeps "pretty" and "drop," so it stays informal. A reliable strategy: read every revision back against the original and ask two questions—"Does it sound academic?" and "Does it still say the same thing?" The right answer must pass both tests. Watch especially for casual signal words like "pretty," "honestly," and "huge," and for overstatements like "everywhere" or "completely."

Question 4

1. Solar panels are basically great because they store energy like a battery, which is pretty cool for the environment.
2. Solar panels store energy in a manner analogous to batteries, providing an environmentally sustainable source of power. (correct answer)
3. Solar panels, radiant guardians of the sun's boundless energy, nobly preserve our planet from the scourge of pollution.
4. Solar panels are considered the most reliable renewable energy source currently in use.

Explanation: Whenever a question asks you to revise for a formal explanatory style, remember that informational essays require precise, objective language—no slang, no personal asides, and no flowery poetry. Your job is to keep the meaning intact while stripping out casual or exaggerated wording. The original sentence makes two points: solar panels store energy like batteries, and they're an environmentally friendly power source. The revision "Solar panels store energy in a manner analogous to batteries, providing an environmentally sustainable source of power" keeps both ideas but replaces the casual comparison ("nature's batteries") with the precise term "analogous," and swaps the chatty "keep our lights on without messing up the planet" for the clear, formal phrase "environmentally sustainable source of power." That's exactly the tone an informational essay needs. The version saying solar panels are "basically great" and "pretty cool for the environment" still leans on informal filler words like "basically" and "pretty cool," so it doesn't fix the tone problem. The choice calling them "radiant guardians of the sun's boundless energy" that "nobly preserve our planet from the scourge of pollution" overcorrects into dramatic, poetic language—that's not formal, it's ornamental and inappropriate for explanation. The option stating solar panels are "the most reliable renewable energy source currently in use" is formal, but it changes the meaning by adding a claim about reliability that wasn't there, and it drops the battery comparison entirely. Tip: Formal doesn't mean fancy. Watch for distractors that either keep slang or swing too far into flowery language—and always check that the meaning stays the same.

Question 5

1. Sentence 1, which explains that the circulatory system moves oxygen, nutrients, and waste through the body.
2. Sentence 2, which introduces the heart as a muscular organ that pumps blood continuously.
3. Sentence 3, which comments that it is amazing your heart beats for your whole life without stopping. (correct answer)
4. Sentence 4, which states that constant pumping delivers to cells the oxygen they need to function.

Explanation: Formal explanatory writing keeps an objective, textbook voice: it states facts precisely and does not slip into the writer's personal reactions or speak casually to the reader. Three of these sentences hold that voice steadily. The sentence about moving oxygen, nutrients, and waste through the body simply reports a fact. The sentence introducing the heart as a muscular organ that pumps continuously uses precise scientific language. The sentence explaining that constant pumping delivers oxygen to cells stays just as objective. The sentence commenting that it is 'honestly pretty amazing' your heart beats your 'whole life' is the one that breaks the pattern. Instead of stating information, the writer shares a personal opinion and talks directly to the reader with 'your,' which shifts the tone into something more casual and conversational. That personal, admiring reaction is what disrupts the formal explanatory style, even though the sentence contains no obvious slang. To find style breaks, look past flashy signals and ask which sentence stops reporting facts and starts sharing the writer's feelings or chatting with the reader.

Question 6

1. Scientists don't have a complete understanding of how some bacteria develop antibiotic resistance.
2. Scientists have not fully understood how some bacteria develop antibiotic resistance.
3. Scientists do not fully understand how some bacteria develop antibiotic resistance. (correct answer)
4. Scientists are totally clueless about how some bacteria develop antibiotic resistance.

Explanation: Whenever a question asks you to keep a "formal style," think about two things: avoiding contractions and slang, and preserving the writer's exact meaning. Formal academic writing spells words out fully and uses precise, professional language. The revision "Scientists do not fully understand how some bacteria develop antibiotic resistance" works because it simply replaces the contraction "don't" with "do not." That single change makes the sentence formal while keeping the meaning identical—scientists still lack full understanding, no more and no less. The version reading "Scientists don't have a complete understanding of..." fixes the meaning but keeps the informal contraction "don't," so it fails the formality test. Watch for revisions that solve one problem while ignoring the one you were actually asked about. "Scientists have not fully understood how some bacteria develop antibiotic resistance" removes the contraction, but the shift to "have not fully understood" subtly changes the meaning. It suggests a past, completed failure rather than an ongoing gap in knowledge, so it doesn't keep the same meaning. "Scientists are totally clueless about how some bacteria develop antibiotic resistance" is the trap for anyone who ignores tone. "Totally clueless" is slang and also exaggerates—"clueless" means knowing nothing, but the original says they don't fully understand. This is both informal and inaccurate. A smart strategy: when a formal-style question offers an option that changes only the contraction and nothing else, that clean, minimal fix is usually correct. Beware of choices that add extra words, because extra words often sneak in a change of meaning.

Question 7

1. This process helps moderate climate conditions in the coastal regions found near these warm currents. (correct answer)
2. This process totally helps moderate the climate conditions in the coastal regions near these warm currents.
3. This process, quite remarkably, helps moderate the climate conditions in the coastal regions near these currents.
4. Isn't it amazing how this process helps moderate the climate conditions in the coastal regions nearby?

Explanation: Formal explanatory writing informs calmly and objectively, matching the plain, factual tone of the sentences around it. The revision that states the idea neutrally—helping moderate climate conditions in the coastal regions found near these warm currents—fits that tone and reads like the rest of the paragraph. The version that says the process "totally" helps uses casual slang that clashes with a formal science paragraph. The version that inserts "quite remarkably" adds an opinion that editorializes rather than reporting a fact objectively. The version beginning "Isn't it amazing" turns the statement into a rhetorical question and calls the process "amazing," which sounds personal and conversational instead of formal. To keep a formal explanatory style, choose the wording that presents information without slang, personal reactions, or emotional coloring—not just the one that avoids an exclamation point, since tone comes from the words themselves, not only the punctuation.

Question 8

1. It's crazy how many different species live there, honestly.
2. Scientists estimate that the region contains more than ten percent of the world's known species. (correct answer)
3. You wouldn't believe how many species call this place home!
4. This magnificent, awe-inspiring jungle teems with countless wondrous creatures beyond imagination.

Explanation: Whenever a question asks you to maintain a formal explanatory style, look for the sentence that sounds like a textbook or a research report: objective, factual, and free of casual language or emotional exaggeration. The tone should match the opening sentence, which calmly states a fact about biodiversity. The sentence "Scientists estimate that the region contains more than ten percent of the world's known species" fits perfectly. It adds a specific, verifiable fact, uses a credible source ("scientists estimate"), and keeps a neutral, informative tone—exactly what explanatory writing demands. Now look at why the others break that tone. "It's crazy how many different species live there, honestly" uses slang ("crazy") and a chatty filler word ("honestly"), making it sound like casual conversation rather than an essay. "You wouldn't believe how many species call this place home!" speaks directly to the reader and uses an exclamation point, creating an informal, persuasive-sounding tone that doesn't belong in explanatory writing. "This magnificent, awe-inspiring jungle teems with countless wondrous creatures beyond imagination" may seem sophisticated, but its piled-up emotional adjectives ("magnificent," "awe-inspiring," "wondrous") make it descriptive and dramatic rather than factual—it tells you how to feel instead of giving information. The trap here is assuming that fancier or more excited language equals better writing. On the 7th-grade writing exam, remember that formal explanatory style prizes facts over feelings. When choosing a continuation, ask yourself: "Does this add clear information in a calm, objective voice?" If a sentence relies on slang, exclamation points, or emotional adjectives, rule it out.

Question 9

1. Studies prove that all children absolutely need more sleep to remember everything.
2. Studies show that children remember stuff better when they sleep enough.
3. Studies show that youngsters recall things more effectively when they catch enough Z's.
4. Studies show that children retain information more effectively when they receive adequate sleep. (correct answer)

Explanation: Whenever a question asks you to revise for "formal style," think like an academic writer: replace casual, vague, or slangy words with precise, professional language—without changing the sentence's meaning or overstating its claims. The strongest revision is "Studies show that children retain information more effectively when they receive adequate sleep." Notice how it swaps every informal word for a formal one: "kids" becomes "children," "remember stuff" becomes "retain information," and "get enough sleep" becomes "receive adequate sleep." It stays accurate and measured—no exaggeration, just clear academic diction. The version claiming "Studies prove that all children absolutely need more sleep to remember everything" is a trap because it overstates the claim. Words like "prove," "all," "absolutely," and "everything" turn a careful finding into an exaggeration—and research rarely "proves" anything so absolutely. "Studies show that children remember stuff better when they sleep enough" fixes only "kids" but keeps the informal "remember stuff better." Partial revisions like this are common distractors, so read the whole sentence. "Studies show that youngsters recall things more effectively when they catch enough Z's" actually gets more casual. "Catch enough Z's" is slang, and "youngsters" sounds colloquial—both wrong for an academic essay. A useful strategy: on formal-style questions, scan for three red flags—slang ("stuff," "Z's"), vague words ("things," "everything"), and exaggeration ("all," "absolutely," "prove"). The best answer eliminates all of them while keeping the original meaning intact. Choose precision over drama.

Question 10

1. It is truly astonishing that continents move at all, don't you think?
2. Over millions of years, entire continents gradually shift position due to the movement of tectonic plates. (correct answer)
3. Continents moving over millions of years is honestly one of the coolest facts in science.
4. The astonishing, almost unbelievable phenomenon of continental drift has captivated scientists for centuries.

Explanation: When a question asks you to maintain a formal explanatory style, remember what that style demands: an objective tone, precise information, and no personal opinions or direct appeals to the reader. Explanatory writing informs; it doesn't chat, gush, or ask for agreement. Watch especially for casual words, questions aimed at the reader, and emotional language — those are all clues that a choice is too informal. The best revision, "Over millions of years, entire continents gradually shift position due to the movement of tectonic plates," works because it delivers the same idea in a neutral, factual voice. It even adds precise cause-and-effect information (the tectonic plates) without any slang or personal reaction. That's exactly what an explanatory essay needs. "It is truly astonishing that continents move at all, don't you think?" keeps the original's rhetorical question and directly addresses the reader — too conversational for formal writing. "Continents moving over millions of years is honestly one of the coolest facts in science" relies on casual, opinion-based language ("honestly," "coolest") that expresses a personal reaction rather than information. "The astonishing, almost unbelievable phenomenon of continental drift has captivated scientists for centuries" sounds sophisticated, but the loaded words "astonishing" and "almost unbelievable" inject emotion, and it drifts away from the original meaning about continents moving over time. Your takeaway: to spot a formal revision, eliminate any choice with opinion words, exclamations, or questions directed at "you." The remaining calm, fact-focused sentence is almost always the answer.

Question 11

1. Cutting down enormous amounts of trees can severely disrupt animal habitats. (correct answer)
2. Removing large numbers of trees really does a lot of damage to animal habitats.
3. The destruction of forests represents one of the greatest tragedies our planet has ever faced.
4. Removing forests completely eliminates every animal habitat across the region.

Explanation: The revision "Cutting down enormous amounts of trees can severely disrupt animal habitats" does both jobs a formality fix requires: it trades slangy wording for precise, academic words ("enormous amounts of," "severely disrupt") and keeps the original meaning that large-scale tree removal harms habitats. "Removing large numbers of trees really does a lot of damage to animal habitats" starts to sound academic, but "really" and "does a lot of damage" are still conversational fillers, so the tone is not fully formal. "The destruction of forests represents one of the greatest tragedies our planet has ever faced" sounds formal, but it overstates the point—the original never called deforestation a top global tragedy, so the meaning shifts into exaggeration. "Removing forests completely eliminates every animal habitat across the region" uses formal wording, yet "completely eliminates" and "every" change the meaning to an absolute claim the original never made. Strategy: on formality questions, upgrade casual words to precise academic ones, then check that the formal-sounding option didn't secretly change the message by adding drama, absolutes, or leftover casual fillers.

Question 12

1. Evaporation, a magnificent transformation, occurs when the sun's heat causes water to turn into vapor, which then majestically rises into the atmosphere.
2. Evaporation occurs when the sun's heat causes water to turn into vapor, and then this cool vapor rises into the atmosphere.
3. Evaporation occurs when the sun's heat causes water to turn into vapor, and then all that vapor stuff rises into the atmosphere.
4. Evaporation occurs when the sun's heat causes water to turn into vapor, and then this vapor rises into the atmosphere. (correct answer)

Explanation: Whenever a question asks you to fix "informal word choice," your job is to find the casual, conversational word or phrase and replace it with something more precise—without adding new information or changing the meaning. In academic essays, you want language that is clear and neutral, not chatty or exaggerated. The problem here is the phrase "this vapor stuff." The word "stuff" is vague, casual filler that doesn't belong in an explanatory essay. The revision "this vapor rises into the atmosphere" simply removes "stuff," leaving a clean, formal sentence that means exactly the same thing. That makes "Evaporation occurs when the sun's heat causes water to turn into vapor, and then this vapor rises into the atmosphere" the best choice. The version calling evaporation "a magnificent transformation" that "majestically rises" fixes the informality but overcorrects—it adds flowery, dramatic words that change the tone and meaning of a factual science sentence. The choice with "this cool vapor" also changes the meaning by inventing a new detail: vapor from the sun's heat isn't cool, so this adds inaccurate information. The choice with "all that vapor stuff" keeps the very word ("stuff") you're supposed to eliminate and actually makes it more casual by adding "all that." Here's your takeaway: the best revision usually makes the smallest precise change needed. Beware of answers that "fix" a problem by swinging too far—either into fancy, exaggerated language or by sneaking in details that weren't originally there. Match the tone to the purpose: science writing stays clear and neutral.