AGES 7–9 · LIFE CYCLES: BUTTERFLIES AND FROGS
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Follow one animal, group equivalent stage names and explain the new-generation arrow.
Chapter index · Worked correction · Discussion and checking · Vocabulary articles
A caterpillar and a winged butterfly can look so different that a child wonders whether they are different animals. This lesson for children aged roughly 7–9 uses twenty words to follow development, recognise stage names and compare a butterfly with a common frog pattern. Start with five words if that suits the learner. An adult can read the story aloud; the age band is a guide, not a test.
The four language editions share numbered meanings, examples and an original story. Use each card’s links to find the same meaning in English, Mandarin, Hindi or Russian. Explain the idea in a familiar language first, then try another expression. A translation may be a phrase, and different labels may refer to one developmental stage. Count the meanings before counting the written labels.
Mandarin uses Simplified Chinese and pinyin with tones. Hindi and Russian include approximate Roman reading aids; Russian stress marks support learning and are usually omitted in everyday writing. The lesson uses invented records and paper cards, without requiring live animals. The frog model is a common pattern rather than a claim about every frog species, and the activities do not require any particular national curriculum.
Chapter index
1–4 · Follow the animal before counting names
5–8 · The frog comparison: words 11–15
9–12 · A gentle seven-day practice plan
Begin by following one animal’s development through time. For our butterfly, the sequence is egg, larva, pupa and adult. Caterpillar is the butterfly’s larval form; chrysalis names its pupa. These extra words help describe the four stages. They do not add new steps between larva and pupa or between pupa and adult. A sequence tells order; it does not tell us how long every stage lasts.
Worked correction
Worked correction: “Egg, larva, caterpillar, pupa, chrysalis, adult: six stages.” Keep all six useful labels. Group larva with caterpillar and pupa with chrysalis. The four developmental groups are egg; larva/caterpillar; pupa/chrysalis; adult. The error was counting names as separate stages. The same grouping remains true when a language needs a longer phrase for a label.
Our frog comparison uses egg, tadpole, froglet and adult as four broad teaching groups. The early tadpole has a tail and gills; during transition, legs develop and the tail is reabsorbed. Frogs do not pass through an insect pupa. The frog and butterfly both change form, but their developmental patterns differ. Some frogs develop directly without a free-living tadpole, so keep our model’s scope visible.
Read the map by relationship: a caterpillar is a larva, and a butterfly pupa is a chrysalis. Tadpole is the larval form in our frog example, but it is not a caterpillar. A shared general word can cover different particular forms. Avoid turning a vocabulary comparison into a claim that a tadpole becomes a butterfly or a caterpillar becomes a frog.
English adult applies to both examples. Chinese 成体 is general, while 成虫 is used for an adult insect and 成蛙 for an adult frog. Hindi डिंभ and the borrowed term larva may both appear in learning materials. Russian куколка names the insect stage here; its everyday doll meaning is irrelevant to this lesson. Keep the biological context when switching languages.
1. life cycle · 生命周期
English: life cycle
The pattern of development and reproduction across generations; one individual does not turn back into an egg.
New eggs belong to the next generation.
中文（普通话）: 生命周期 (shēngmìng zhōuqī)
跨世代发育与繁殖的规律，不是一个个体又变回卵。
新卵属于下一代。
हिन्दी: जीवन चक्र (jīvan cakra)
पीढ़ियों में विकास और प्रजनन का क्रम; एक जीव फिर अंडा नहीं बनता।
नए अंडे अगली पीढ़ी के हैं।
Русский: жи́зненный цикл (zhiznennyy tsikl)
Последовательность развития и размножения между поколениями; особь не превращается обратно в яйцо.
Новые яйца относятся к следующему поколению.
Try it: Explain the next-generation link.
2. egg · 卵
English: egg
A stage in which an embryo develops; here we discuss butterfly and frog eggs.
The butterfly larva develops in an egg before hatching.
中文（普通话）: 卵 (luǎn)
胚胎发育的阶段，此处为蝶卵蛙卵。
蝶幼虫孵化前在卵中发育。
हिन्दी: अंडा (aṇḍā)
भ्रूण विकसित होने का चरण; यहाँ तितली और मेंढक के अंडे।
निकलने से पहले तितली का डिंभ अंडे में विकसित होता है।
Русский: яйцо́ (yaytso)
Стадия развития зародыша; здесь яйца бабочки и лягушки.
Личинка бабочки развивается в яйце до вылупления.
Try it: Name what develops inside the egg.
3. hatch · 孵化
English: hatch
Emerge from an egg; an adult butterfly emerging from a pupa is a different event.
A caterpillar hatches from the butterfly egg.
中文（普通话）: 孵化 (fūhuà)
从卵出来；成蝶出蛹为另一事件。
毛毛虫从蝶卵孵化。
हिन्दी: अंडे से निकलना (aṇḍe se nikalnā)
अंडे से बाहर आना; प्यूपा से वयस्क तितली निकलना अलग घटना।
तितली के अंडे से इल्ली निकलती है।
Русский: вылупля́ться (vyluplyatsya)
Выходить из яйца; выход взрослой бабочки из куколки — другое событие.
Из яйца бабочки вылупляется гусеница.
Try it: Separate hatching from emergence out of a pupa.
4. larva · 幼虫
English: larva
A young developmental form before metamorphosis; a caterpillar is a butterfly larva and a tadpole is a frog larva.
Larva and caterpillar name the same butterfly stage here.
中文（普通话）: 幼虫 (yòuchóng)
变态前幼年形态；毛毛虫为蝶幼虫，蝌蚪为蛙幼体。
本课幼虫与毛毛虫指同一蝶阶段。
हिन्दी: डिंभ (ḍimbh)
कायांतरण से पहले का युवा रूप; इल्ली तितली का, टैडपोल मेंढक का डिंभ।
यहाँ डिंभ और इल्ली तितली का वही चरण हैं।
Русский: личи́нка (lichinka)
Молодая форма до метаморфоза; гусеница — личинка бабочки, головастик — личинка лягушки.
Здесь личинка и гусеница называют одну стадию бабочки.
Try it: Give a particular example of a larva.
5. caterpillar · 毛毛虫
English: caterpillar
The larva of a butterfly or moth; in this lesson it belongs to the butterfly sequence.
The caterpillar grows before becoming a pupa.
中文（普通话）: 毛毛虫 (máomaochóng)
蝶或蛾幼虫，本课属于蝶序列。
毛毛虫成蛹前生长。
हिन्दी: इल्ली (illī)
तितली या पतंगे का डिंभ; यहाँ तितली क्रम में।
इल्ली प्यूपा बनने से पहले बढ़ती है।
Русский: гу́сеница (gusenitsa)
Личинка бабочки или мотылька; здесь часть последовательности бабочки.
Гусеница растёт до превращения в куколку.
Try it: Place caterpillar with its matching general term.
6. pupa · 蛹
English: pupa
The insect stage between larva and adult in complete metamorphosis; it is living and developing.
The pupa is a developmental stage, not a dead object.
中文（普通话）: 蛹 (yǒng)
完全变态昆虫幼虫与成虫间阶段，仍活着发育。
蛹是发育阶段，不是死物。
हिन्दी: प्यूपा (pyūpā)
पूर्ण कायांतरण में डिंभ-वयस्क के बीच कीट चरण; जीवित और विकसित।
प्यूपा विकास का चरण है, मृत वस्तु नहीं।
Русский: ку́колка (kukolka)
Стадия насекомого между личинкой и взрослой формой при полном превращении; живая и развивающаяся.
Куколка — стадия развития, не мёртвый предмет.
Try it: Explain why a still pupa can be alive.
7. chrysalis · 蝶蛹
English: chrysalis
A butterfly pupa; this is another name for its pupal stage, not an extra stage after pupa.
We place pupa and chrysalis on one stage card.
中文（普通话）: 蝶蛹 (diéyǒng)
蝴蝶的蛹，为该蛹阶段另一名称，不是蛹后额外阶段。
蛹与蝶蛹放同一阶段卡。
हिन्दी: तितली का प्यूपा (titlī kā pyūpā)
तितली का प्यूपा; उसी चरण का नाम, प्यूपा के बाद अतिरिक्त चरण नहीं।
प्यूपा और क्रिसलिस एक चरण-कार्ड पर हैं।
Русский: ку́колка ба́бочки (kukolka babochki)
Куколка бабочки; другое название её стадии куколки, не дополнительная стадия после неё.
Pupa и chrysalis помещаем на одну карточку стадии.
Try it: Group chrysalis with pupa.
8. adult · 成体
English: adult
The mature developmental stage associated with reproduction; for insects, adult is the stage after pupa here.
The adult butterfly has developed wings; a large caterpillar is still a larva.
中文（普通话）: 成体 (chéngtǐ)
与繁殖相关的成熟发育阶段；本课昆虫为蛹后成虫。
成蝶有发育的翅，大毛毛虫仍幼虫。
हिन्दी: वयस्क (vayask)
प्रजनन से जुड़ा परिपक्व चरण; यहाँ कीट में प्यूपा के बाद।
वयस्क तितली के पंख हैं; बड़ी इल्ली अभी डिंभ है।
Русский: взро́слая осо́бь (vzroslaya osob)
Зрелая стадия, связанная с размножением; у нашего насекомого следует после куколки.
У взрослой бабочки развиты крылья; крупная гусеница остаётся личинкой.
Try it: Explain why size alone does not show adulthood.
9. butterfly · 蝴蝶
English: butterfly
An insect with egg, larval, pupal and adult stages; its familiar winged form is the adult.
The caterpillar and winged butterfly are forms in one life history.
中文（普通话）: 蝴蝶 (húdié)
有卵幼虫蛹成虫阶段的昆虫，常见有翅形态是成虫。
毛毛虫和有翅蝶是同一生命历程的形态。
हिन्दी: तितली (titlī)
अंडा, डिंभ, प्यूपा, वयस्क वाला कीट; परिचित पंख वाला रूप वयस्क।
इल्ली और पंख वाली तितली एक जीवन-इतिहास के रूप हैं।
Русский: ба́бочка (babochka)
Насекомое со стадиями яйца, личинки, куколки и взрослой формы; знакомая крылатая форма взрослая.
Гусеница и крылатая бабочка — формы одной истории развития.
Try it: Trace the same butterfly through four groups.
10. metamorphosis · 变态发育
English: metamorphosis
A major change in body form during development; butterfly and frog changes have different patterns.
A frog changes form without a butterfly-like pupal stage.
中文（普通话）: 变态发育 (biàntài fāyù)
发育中体形重大改变，蝶蛙模式不同。
蛙改变形态，没有蝶式蛹阶段。
हिन्दी: कायांतरण (kāyāntaraṇ)
विकास में शरीर-रूप का बड़ा बदलाव; तितली-मेंढक का क्रम अलग।
मेंढक रूप बदलता है, तितली जैसा प्यूपा चरण नहीं।
Русский: метаморфо́з (metamorfoz)
Существенное изменение строения при развитии; у бабочки и лягушки разные схемы.
Лягушка меняет форму без стадии куколки, как у бабочки.
Try it: Compare frog and butterfly transformations.
11. frog · 青蛙
English: frog
An amphibian; our lesson follows a common egg–tadpole–froglet–adult pattern, while frog species vary.
Our frog sequence does not describe every frog species.
中文（普通话）: 青蛙 (qīngwā)
两栖动物，本课用常见卵蝌蚪幼蛙成蛙模式，物种有差异。
本课蛙序列不代表所有物种。
हिन्दी: मेंढक (meṃḍhak)
उभयचर; यहाँ सामान्य अंडा-टैडपोल-फ्रॉगलेट-वयस्क क्रम, प्रजातियाँ अलग हो सकती हैं।
हमारा क्रम हर मेंढक प्रजाति का वर्णन नहीं।
Русский: лягу́шка (lyagushka)
Земноводное; здесь обычная схема яйцо–головастик–лягушонок–взрослая особь, виды различаются.
Наша последовательность не описывает все виды лягушек.
Try it: State the scope of our frog model.
12. tadpole · 蝌蚪
English: tadpole
The aquatic larva in our frog model, with a tail and gills in its early form.
A tadpole is a young frog form, not a young fish.
中文（普通话）: 蝌蚪 (kēdǒu)
本蛙模型水生幼体，早期有尾及鳃。
蝌蚪是蛙的幼体，不是小鱼。
हिन्दी: टैडपोल (ṭaiḍpol)
हमारे मेंढक मॉडल का जलीय डिंभ, शुरुआती रूप में पूँछ और गलफड़े।
टैडपोल मेंढक का युवा रूप, छोटी मछली नहीं।
Русский: голова́стик (golovastik)
Водная личинка в нашей модели лягушки; в раннем виде с хвостом и жабрами.
Головастик — молодая форма лягушки, не маленькая рыба.
Try it: Explain why swimming does not make a tadpole a fish.
13. froglet · 幼蛙
English: froglet
A young frog during or after the transition from tadpole; our transition example has four legs and a shortening tail.
Our froglet still has a small tail remnant.
中文（普通话）: 幼蛙 (yòuwā)
蝌蚪过渡中或之后的小蛙，本过渡例四腿与缩短尾。
本幼蛙仍有小尾残段。
हिन्दी: नन्हा मेंढक (फ्रॉगलेट) (nanhā meṃḍhak (froglet))
टैडपोल से परिवर्तन के दौरान या बाद का युवा मेंढक; यहाँ चार पैर, छोटी होती पूँछ।
हमारे फ्रॉगलेट की थोड़ी पूँछ बची है।
Русский: лягушо́нок (lyagushonok)
Молодая лягушка при переходе от головастика или после; здесь четыре ноги и укорачивающийся хвост.
У нашего лягушонка ещё небольшой остаток хвоста.
Try it: Describe the tail remnant in the froglet record.
14. gills · 鳃
English: gills
Organs that take oxygen from water; early tadpoles in our model use them.
The early tadpole has gills.
中文（普通话）: 鳃 (sāi)
从水取氧的器官，本模型早蝌蚪使用。
早期蝌蚪有鳃。
हिन्दी: गलफड़े (galphaṛe)
पानी से ऑक्सीजन लेने के अंग; मॉडल के शुरुआती टैडपोल में।
शुरुआती टैडपोल के गलफड़े हैं।
Русский: жа́бры (zhabry)
Органы получения кислорода из воды; ими пользуется ранний головастик нашей модели.
У раннего головастика есть жабры.
Try it: Say what gills obtain from water.
15. lungs · 肺
English: lungs
Organs for taking oxygen from air; many adult frogs also exchange gases through moist skin.
Lungs are not the only breathing surface of many frogs.
中文（普通话）: 肺 (fèi)
从空气取氧器官，许多成蛙也经湿皮肤交换气体。
肺不是许多蛙唯一呼吸部位。
हिन्दी: फेफड़े (phephṛe)
हवा से ऑक्सीजन लेने के अंग; कई वयस्क मेंढक नम त्वचा से भी गैस-विनिमय करते हैं।
कई मेंढकों में केवल फेफड़े ही श्वसन सतह नहीं।
Русский: лёгкие (lyogkiye)
Органы получения кислорода из воздуха; многие взрослые лягушки также обмениваются газами через влажную кожу.
У многих лягушек лёгкие не единственная поверхность дыхания.
Try it: Mention moist skin as well as lungs for many frogs.
16. tail · 尾巴
English: tail
The rear extension of the body; a tadpole’s tail is gradually reabsorbed during our frog transition.
The tail shortens through reabsorption rather than simply dropping off.
中文（普通话）: 尾巴 (wěiba)
身体后部延伸，本蛙过渡中蝌蚪尾逐渐被吸收。
尾通过吸收缩短，不是简单掉落。
हिन्दी: पूँछ (pū̃ch)
शरीर का पिछला विस्तार; हमारे परिवर्तन में टैडपोल की पूँछ धीरे पुनः अवशोषित होती है।
पूँछ पुनः अवशोषण से छोटी होती, बस गिरती नहीं।
Русский: хвост (khvost)
Задний вырост тела; при нашем переходе хвост головастика постепенно рассасывается.
Хвост укорачивается при рассасывании, не просто отваливается.
Try it: Explain reabsorption rather than a falling-off tail.
17. stage · 阶段
English: stage
A recognisable part of development; two names can refer to the same stage.
Four butterfly stages can have more than four useful labels.
中文（普通话）: 阶段 (jiēduàn)
发育可识别的一部分，同阶段可有两名称。
蝶四阶段可有超过四个有用名称。
हिन्दी: चरण (caraṇ)
विकास का पहचाना भाग; दो नाम एक ही चरण के हो सकते हैं।
तितली के चार चरणों के चार से अधिक नाम हो सकते हैं।
Русский: ста́дия (stadiya)
Различимая часть развития; два названия могут относиться к одной стадии.
У четырёх стадий бабочки может быть больше четырёх полезных названий.
Try it: Count stage groups rather than labels.
18. grow · 生长
English: grow
Increase in size or develop; becoming larger is not by itself proof of reaching the adult stage.
A caterpillar can grow while remaining a larva.
中文（普通话）: 生长 (shēngzhǎng)
增大或发育，变大本身不足证明成体阶段。
毛毛虫可长大仍为幼虫。
हिन्दी: बढ़ना (baṛhnā)
आकार बढ़ना या विकसित होना; बड़ा होना अकेले वयस्क चरण का प्रमाण नहीं।
इल्ली बढ़कर भी डिंभ रह सकती है।
Русский: расти́ (rasti)
Увеличиваться или развиваться; размер сам по себе не доказывает взрослую стадию.
Гусеница может расти, оставаясь личинкой.
Try it: Give growth without a new stage.
19. compare · 比较
English: compare
Look for similarities and differences while naming what is being compared.
Compare stage order rather than assuming equal time in each stage.
中文（普通话）: 比较 (bǐjiào)
说比较对象，找相同与不同。
比阶段顺序，不假定各阶段同时间。
हिन्दी: तुलना करना (tulnā karnā)
क्या तुलना है बताकर समानता-अंतर देखना।
क्रम तुलना करें, हर चरण में बराबर समय न मानें।
Русский: сра́внивать (sravnivat)
Находить сходства и различия, называя объекты сравнения.
Сравните порядок стадий, не предполагая одинакового времени.
Try it: Compare order without assuming equal time.
20. observe · 观察
English: observe
Notice and describe features; distinguish what is visible from what a source explains.
We can see legs in a picture, but a picture alone does not show lung function.
中文（普通话）: 观察 (guānchá)
留意描述特征，分清可见与资料解释。
图可看腿，单图不展示肺功能。
हिन्दी: अवलोकन करना (avlokan karnā)
विशेषताएँ देखना-बताना; दिखता क्या, स्रोत क्या समझाता, अलग रखें।
चित्र में पैर दिखते, अकेला चित्र फेफड़ों का काम नहीं दिखाता।
Русский: наблюда́ть (nablyudat)
Замечать и описывать признаки; различать видимое и объяснённое источником.
Ноги видны на рисунке, работа лёгких по одному рисунку не видна.
Try it: Separate a visible feature from a source explanation.
The story and records below are original fictional teaching examples, not observations of real classroom animals. B1 tracks one imagined butterfly through four stages; F1 tracks one imagined frog through the stated common pattern. Record numbers mark order only. They are not days, ages, lengths or equal time intervals. We have not identified a species or assigned a universal timetable.
A cycle diagram can link an adult to new eggs through reproduction. That link crosses generations: it does not show the adult shrinking into its own egg. B1 remains the same individual through its egg, larval, pupal and adult stages. New eggs would contain offspring, not a younger B1. Likewise, a collection of four separate stage photographs is not proof that one animal was followed continuously unless the record says so.
| Record order | Individual | Stage |
|---|---|---|
| 1 | B1 | Egg |
| 2 | B1 | Larva / caterpillar |
| 3 | B1 | Pupa / chrysalis |
| 4 | B1 | Adult butterfly |
| Record order | Individual | Stage and described feature |
|---|---|---|
| 1 | F1 | Egg |
| 2 | F1 | Early tadpole: tail and gills |
| 3 | F1 | Froglet: legs, shrinking tail remnant |
| 4 | F1 | Adult frog: mature form, no tail |
English · Six Names, Four Stages
Nila placed six paper labels on the table: egg, larva, caterpillar, pupa, chrysalis and adult. “Six stages,” she said. Sam opened an imaginary record called B1. It followed one butterfly through development, without giving dates or a species name.
They placed larva beside caterpillar. Both labels described B1’s second stage. Pupa and chrysalis belonged together on the third. Egg was first and adult fourth. Nila kept all six useful names but made four stage cards. “I was counting labels,” she said. “Now I’m counting the stages they describe.”
The record showed a growing caterpillar before the pupa. Sam asked whether a larger caterpillar had already become adult. Nila pointed to its developmental form. “It has grown, but it is still a larva. Size alone doesn’t choose the stage.”
At the next record the butterfly was a living pupa, changing towards the adult form. The children did not call it dead because it looked still. They also kept hatching from an egg separate from an adult emerging from the pupa.
Next they opened F1, an imagined frog following a common egg, tadpole, froglet and adult pattern. The early tadpole had a tail and gills. Their froglet had legs and a shrinking tail remnant. The adult record described the mature form without a tail. No frog pupa appeared.
“The tadpole swims, so is it a fish?” Sam asked. Nila preserved the swimming observation but followed F1’s frog life history. One action did not change which animal the record followed. They added that this common frog pattern did not describe every frog species.
Finally Sam drew an arrow from an adult to new eggs. Nila almost said B1 became an egg again. They added “next generation” beside the arrow. The new eggs would hold offspring; the adult would not shrink back into its own beginning.
Their final note read: “Follow the animal, check what each name means, and ask what the arrow connects.”
中文（普通话） · 六名称，四阶段
妮拉把六纸标签排桌上：卵、幼虫、毛毛虫、蛹、蝶蛹、成虫。“六阶段。”她说。萨姆开想象记录B1，跟同一蝶发育，无日期物种。
幼虫与毛毛虫并放，都是B1第二阶段；蛹蝶蛹同属第三。卵第一、成虫第四。妮拉保留六名，做四阶段卡：“之前数标签，现在数它们所指阶段。”
记录有成蛹前长大毛毛虫。萨姆问较大毛虫已成体吗？妮拉指发育形态：“长了，仍幼虫，大小不足选阶段。”
下一记录是活蛹，往成虫形态发育。虽看似不动，也不叫死。孩子分清卵中孵化与成虫出蛹为不同事件，不在蛹与蝶蛹间加一步。
再开F1，想象蛙走常见卵、蝌蚪、幼蛙、成蛙。早蝌蚪尾与鳃；幼蛙有腿、小尾残段缩短；成蛙成熟无尾，无蛙蛹阶段。
“蝌蚪游泳，是鱼吗？”萨姆问。妮拉保游泳观察，跟F1蛙生命历程，一行为不改所跟动物。他们加注这是常见模式，并非每一蛙种。
最后萨姆画成年到新卵箭头。妮拉差点说B1变卵，便在箭头旁写下一代。新卵为后代，成体不会缩回自己的起点。
最后笔记：“跟动物，查名所指，问箭头连什么。”他们用另一语同号卡练毛毛虫与幼虫，语言换了，阶段数不变。
हिन्दी · छह नाम, चार चरण
नीला ने छह कागज़ नाम रखे: अंडा, डिंभ, इल्ली, प्यूपा, क्रिसलिस और वयस्क। ‘छह चरण,’ उसने कहा। सैम ने B1 नाम का कल्पित अभिलेख खोला। एक तितली का विकास था, तारीख या प्रजाति नहीं।
डिंभ-इल्ली साथ रखे: B1 का दूसरा चरण। प्यूपा-क्रिसलिस तीसरे पर साथ। अंडा पहला, वयस्क चौथा। नीला ने छह उपयोगी नाम रखकर चार चरण-कार्ड बनाए। ‘पहले नाम गिन रही थी, अब उनके बताए चरण।’
अभिलेख में प्यूपा से पहले बढ़ती इल्ली थी। सैम ने पूछा बड़ी इल्ली वयस्क हो गई? नीला ने विकास रूप दिखाया। ‘बढ़ी, मगर डिंभ है। अकेला आकार चरण नहीं चुनता।’
अगली प्रविष्टि जीवित प्यूपा थी, वयस्क रूप की ओर बदलती। स्थिर दिखने से उसे मृत नहीं कहा। अंडे से निकलना और प्यूपा से वयस्क निकलना अलग घटनाएँ रखीं।
फिर F1 खोला: सामान्य अंडा, टैडपोल, फ्रॉगलेट, वयस्क क्रम वाला कल्पित मेंढक। शुरुआती टैडपोल की पूँछ-गलफड़े; फ्रॉगलेट के पैर और छोटी होती बची पूँछ; वयस्क परिपक्व बिना पूँछ। मेंढक का प्यूपा नहीं था।
‘टैडपोल तैरता, तो मछली?’ सैम ने पूछा। नीला ने तैरने का सही अवलोकन रखा, F1 का मेंढक जीवन-इतिहास देखा। एक क्रिया जीव नहीं बदलती। उन्होंने जोड़ा: सामान्य क्रम हर मेंढक प्रजाति का नहीं।
आखिर वयस्क से नए अंडों का तीर बनाया। नीला लगभग बोली B1 फिर अंडा बनता है। तीर पर ‘अगली पीढ़ी’ लिखा। नए अंडे संतान, वयस्क अपनी शुरुआत में छोटा होकर नहीं लौटता।
अंतिम नोट: ‘जीव का क्रम देखो, नाम का अर्थ जाँचो और तीर क्या जोड़ता है पूछो।’
Русский · Шесть названий, четыре стадии
Нила разложила шесть бумажных подписей: яйцо, личинка, гусеница, pupa, chrysalis, взрослая форма. «Шесть стадий», — сказала она. Сэм открыл вымышленную запись B1 о развитии одной бабочки, без дат и вида.
Личинку положили рядом с гусеницей: обе подписи второй стадии B1. Pupa и chrysalis объединили на третьей. Яйцо первое, взрослая форма четвёртая. Нила сохранила шесть полезных названий, но сделала четыре карточки. «Раньше считала подписи, теперь стадии».
В записи гусеница росла до превращения в куколку. Сэм спросил, стала ли крупная гусеница взрослой. Нила указала на форму развития. «Выросла, но личинка. Одного размера недостаточно».
Следующей была живая куколка, развивающаяся к взрослой форме. Дети не назвали её мёртвой из-за неподвижного вида. Вылупление из яйца отличили от выхода взрослой бабочки из куколки.
Затем открыли F1: воображаемую лягушку обычной схемы яйцо, головастик, лягушонок, взрослая особь. У раннего головастика хвост и жабры, у лягушонка ноги и сокращающийся остаток хвоста, у взрослой формы хвоста нет. Куколки лягушки не было.
«Головастик плавает, значит, рыба?» — спросил Сэм. Нила сохранила наблюдение о плавании и проследила историю лягушки F1. Одно действие не меняет животное. Они добавили: обычная схема не описывает все виды.
В конце Сэм провёл стрелку от взрослой формы к новым яйцам. Нила чуть не сказала, что B1 снова становится яйцом. Возле стрелки написали «следующее поколение». Новые яйца — потомство; взрослая особь не уменьшается до собственного начала.
Последняя заметка: «Проследи животное, проверь смысл названий и спроси, что соединяет стрелка».
Answer aloud, arrange word cards or point to a stated feature. Try “These two labels belong together because ___.” Give time to identify the animal and stage before choosing a term. The checking guide is visible below. Compare the explanation as well as the final answer; an explanation in the learner’s strongest language is welcome.
1. Why are six butterfly names only four stage groups?
2. Does a bigger caterpillar have to be adult?
3. Is a pupa dead because it looks still?
4. What hatches from our butterfly egg?
5. Does a tadpole become a butterfly?
6. What happens to the tadpole’s tail in our transition?
7. Does every frog have a free-living tadpole?
8. Does the adult-to-egg arrow make B1 an egg again?
9. Do records 1–4 mean four equal days?
10. Can a drawing alone show how lungs function?
Discussion guide
Larva/caterpillar are one stage; pupa/chrysalis another. Egg and adult complete four.
No. It can grow while remaining larval; developmental form matters, not size alone.
No. It is a living developmental stage with major changes taking place.
A larva or caterpillar. The adult later emerges from the pupa, a different event.
No. Our tadpole follows the frog record F1. Caterpillar belongs to butterfly record B1.
It is gradually reabsorbed. Our froglet still has a remnant; the adult record has no tail.
No. Some develop directly. Our sequence is a common model, not a universal rule.
No. It represents reproduction and offspring of a new generation.
No. Numbers show order only. No durations or dates are given.
No. A drawing may show a labelled organ; function requires explanation or other evidence. Many frogs also use moist skin for gas exchange.
Use five to ten calm minutes and pause earlier if needed. This flexible plan does not promise mastery in seven days. Paper cards and the supplied records are sufficient; collecting eggs, handling animals or raising them is unnecessary. Revisit one useful contrast at a time, then change language while keeping the meaning stable.
| Day | Words | Small activity | What to notice |
|---|---|---|---|
| 1 | 1–5 | Group larva with caterpillar. | Names can share one stage. |
| 2 | 6–10 | Arrange four butterfly stage cards. | Pupa and chrysalis stay together. |
| 3 | 11–15 | Describe the common frog pattern. | The model has a stated scope. |
| 4 | 16–20 | Compare a growing larva with a changing froglet. | Growth and stage change need careful descriptions. |
| 5 | 1–20 | Read the shared story. | Track the individual through time. |
| 6 | Selected five | Open matching cards in a second language. | The meaning stays while expression changes. |
| 7 | Review | Explain the new-generation arrow. | The adult does not become an egg again. |
If the learner counts six butterfly stages, keep the six labels but place synonyms on the same card. Ask whether the record describes an additional body form between larva and caterpillar. It does not. This repairs the thing being counted rather than discarding useful vocabulary. Repeat with the four languages: a longer translated phrase also does not add a biological stage.
If the learner says a tadpole is a fish because it swims, preserve the observation about swimming. Use the stated life history: F1 develops through the frog sequence. One shared action or body feature is insufficient to assign the animal to a different group. If the learner says a large caterpillar must be adult, ask for the developmental stage rather than relying only on size.
If the biological relationship is clear but a translated term is difficult to retrieve, keep the explanation and practise that language link. If the vocabulary is fluent but a claim exceeds the record, return to what is observed and what a reliable source explains. A word-retrieval gap and a reasoning gap need different next steps; neither is a diagnosis of the child.
Transfer the idea to an unfamiliar butterfly record with six written labels: egg; caterpillar/larva; chrysalis/pupa; adult. It still contains four stage groups. Then compare the froglet in F1 with the adult frog: the froglet record includes a small tail remnant, while the adult record describes the mature form without a tail. The froglet’s appearance does not add a pupal stage.
A useful progress sentence is “I can follow the individual, group the stage names and explain the next-generation link.” Explain one relationship in a familiar language, then find its numbered card in another. Do not infer an exact age, species, survival rate or breathing mechanism from a picture alone. A careful question is a useful part of observation.
| Written labels | Stage group |
|---|---|
| Egg | 1 |
| Caterpillar / larva | 2 |
| Chrysalis / pupa | 3 |
| Adult | 4 |
Are larva and caterpillar separate butterfly stages?
No. Caterpillar names the butterfly’s larval form. Two labels identify one stage.
Are pupa and chrysalis separate steps?
No. Chrysalis is the butterfly pupa. A cocoon, when present, is a surrounding silk structure, not an extra developmental stage.
Does adult just mean the biggest individual?
No. It is a developmental stage associated with maturity and reproduction. A large caterpillar remains larval.
Does a tadpole’s tail fall off?
In the common transition here it is gradually reabsorbed. A froglet can retain a shrinking remnant.
Do frogs have a pupal stage?
No. Metamorphosis is a broad shared idea, not an identical sequence for every animal.
Do all frogs follow this model?
No. Some develop directly without a free-living tadpole. Exact timing, habitat and feeding details need species-specific information.
Does the adult become its own egg again?
No. The new-egg arrow represents reproduction and offspring in a new generation.
How can children learn four languages calmly?
Keep one meaning steady, explain it in a familiar language and open the matching numbered card elsewhere. Five understood words can be enough for one session.
Background reading for adults
Adult background references on butterfly and frog development. Our cards, B1 and F1 records and story are original fictional examples. They do not report real classroom animals, prescribe a universal timetable or make national curriculum claims.
- Florida Museum · Butterfly and moth questions
- Australian Museum · Frog life cycle
- Natural History Museum · Frogspawn, tadpoles and froglets