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IELTS Writing Task 1Process DiagramBands 4.5 · 5.5 · 6.5 · 7.5STUDENT'S EDITION

The Life Cycle of the Silkworm

Choose your band on the left → learn the stages, formulas and linkers → translate → build the Introduction, Overview, Body 1 and Body 2 → compare with the model.

The Task

The diagram below shows the life cycle of the silkworm.

Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

Write at least 150 words.

The life cycle of the silkwormPhase 1: Egg and feeding silkworm (stages 1–2)Phase 2: Cocoon and adult moth (stages 3–5)1Eggs on mulberryleaveshatch in about 10 days2Silkworm (larva)feeds4–6 weeks+ mulberry leaves3Spinning a cocoon*3–4 days↗ silk thread4Pupa inside thecocoonabout 2 weeks5Moth emerges andlays eggs↗ new eggsLife cycle of thesilkworm*cocoon: a case of silk thread that the silkworm spins around itself. Times are approximate.
← swipe to see the whole diagram →
How to use this lesson: choose a band in the Band Standard bar (left; on a phone, at the top). Every step then shows sentences, exercises and the model for that band. Start at your current band, then try the next one up.

1How many stages? Name them.

The diagram has 5 stages. It is a natural process (a life cycle) shown as a cycle: eggs hatch into silkworms, which spin cocoons, change into moths and lay new eggs.

Phase 1 – Egg and feeding silkworm (Stages 1–2)

  1. 1
    EggsTiny eggs are laid on mulberry leaves.
  2. 2
    Silkworm feedingThe silkworm eats mulberry leaves and grows quickly.

Phase 2 – Cocoon and adult moth (Stages 3–5)

  1. 3
    Spinning a cocoonThe silkworm spins a cocoon of silk thread around itself.
  2. 4
    PupaInside the cocoon, the silkworm changes into a pupa.
  3. 5
    Adult mothAn adult moth comes out of the cocoon and lays eggs.
The diagram does not label the phases. This lesson divides the cycle into the egg and the feeding silkworm (stages 1–2) and the cocoon and the adult moth (stages 3–5).

3Sentence Formulas

The structure behind each Band 6.5 sentence. Change the band on the left to see another level.

LinkerSubjectVerbObject / Place / ResultTime / Purpose
StageBand 4.5 formula
1 EggsFirst + adj + N + lays + adj + N + on + N
2 Silkworm feedingNext + adj + N + come out + and eat + N + for + time
3 Spinning a cocoonIn the second part + N + makes + N + from + N + in + time
4 PupaAfter that + N + changes into + N + inside + N + for about + time
5 Adult mothFinally + N + comes out of + N + and lays + adj + N, so + the cycle + starts again
StageBand 5.5 formula
1 EggsTo begin with + adj + N + are + V3 + on + N, and + they + hatch + after about + time
2 Silkworm feedingAfter that + adj + N + feed on + N + for + time + and grow quickly
3 Spinning a cocoonIn the second stage + N + spins + adj + N + around itself + in + time
4 PupaNext + inside + N, it + turns into + N, and + this + N + lasts + about + time
5 Adult mothFinally + adj + N + breaks out of + N + and lays + N, and + the cycle + begins again
StageBand 6.5 formula
1 EggsThe cycle begins when + adj + N + are + V3 + on + N, which + hatch + within about + time
2 Silkworm feedingFollowing this + N, or + N + feed on + N + for + time, during which time + they + grow rapidly
3 Spinning a cocoonTurning to the second phase + N + spins + N + from + adj + N + over + time
4 PupaInside the + N + N + develops into + N, a stage which + V + about + time
5 Adult mothIn the final stage + adj + N + emerges from + N + and lays + its own + N, so + the cycle + repeats
StageBand 7.5 formula
1 EggsThe cycle commences with + the + N-ing + of + adj + N + on + N, which + hatch + within approximately + time
2 Silkworm feedingSubsequently + adverb + V3 + N + feed on + N + for a period of + time, increasing + adverb + in + N
3 Spinning a cocoonTurning to the second phase + adverb + adj + N + encloses itself in + N, spinning it from + adj + N + over + time
4 PupaV3 + within + N (reduced clause) + it + undergoes + metamorphosis into + N + over roughly + time
5 Adult mothIn the final stage + adj + N + emerges + and lays + a new batch of + N, thereby + V-ing + N

4Linkers – Sequencing Words & Transitions

Use a different linker for each stage – never “Then … Then … Then”. These are the linkers for Band 6.5.

Beginning

  • First

Next step

  • Next
  • Then
  • After that

Ending

  • Finally

Joining

  • … and + V3 (are taken out and put …)
  • to + V (to make)

Beginning

  • To begin with
  • First of all

Next step

  • After that / After this
  • Next
  • Then

Change of place / phase

  • In the second stage, …
  • In the factory, …

Ending

  • Finally

Joining

  • …, and then …
  • … called + N

Beginning

  • The process begins when …
  • The process begins with + N

Next step

  • Following this
  • Subsequently
  • Next

Time clauses

  • Once + adj (Once dry, …)
  • After + N (After fermentation, …)

Inside a stage

  • …, where + clause
  • …, which + verb
  • … known as + N
  • …, a stage which lasts …

Change of phase

  • Turning to the … stage, …

Ending

  • In the final stage

Beginning

  • The process commences with + the + N of + N

Time

  • Once + V3 (Once extracted, …)
  • Following + N (Following roasting, …)

Next step

  • Subsequently
  • To complete the … phase, …

Result phrases

  • …, leaving only + N
  • …, producing + N
  • …, resulting in + N

Naming

  • … referred to as + N
  • … ranging from X to Y

Ending

  • In the final stage
  • … culminating in + N

5Translation Practice – Vietnamese → English

Translate each sentence into English. The word in ( ) is the key word you must use. Check the Tense note, write your answer, then press Show answer.

🔒 The answers in Step 5 are locked. Enter Password 1 from your teacher:

Band 4.5 – 5 sentences

1

Đầu tiên, bướm tằm cái đẻ (lays) những quả trứng nhỏ trên lá dâu.

Hiện tại đơn chủ động: lays
2

Tiếp theo, những con tằm nhỏ chui ra và ăn (eat) lá dâu trong bốn đến sáu tuần.

Hiện tại đơn chủ động: come out, eat
3

Ở phần thứ hai, con tằm làm (makes) một cái kén từ tơ trong ba đến bốn ngày.

Hiện tại đơn chủ động: makes
4

Sau đó, con tằm biến đổi (changes) thành nhộng bên trong kén khoảng hai tuần.

Hiện tại đơn chủ động: changes
5

Cuối cùng, một con bướm tằm chui ra khỏi kén (cocoon) và đẻ trứng mới, nên chu trình bắt đầu lại.

Hiện tại đơn chủ động + so (kết quả)

Band 5.5 – 5 sentences

1

Trước tiên, những quả trứng nhỏ được đẻ trên lá dâu (mulberry leaves), và chúng nở sau khoảng 10 ngày.

Hiện tại đơn bị động (are laid) + chủ động (hatch)
2

Sau đó, những con tằm non ăn (feed on) lá dâu trong bốn đến sáu tuần và lớn nhanh.

Hiện tại đơn chủ động: feed, grow
3

Ở giai đoạn thứ hai, con tằm nhả tơ (spins) tạo thành một cái kén quanh mình trong ba đến bốn ngày.

Hiện tại đơn chủ động: spins
4

Tiếp theo, bên trong kén, nó biến thành nhộng (pupa), và giai đoạn này kéo dài khoảng hai tuần.

Hiện tại đơn chủ động: turns, lasts
5

Cuối cùng, một con bướm trưởng thành phá kén chui ra (breaks out) và đẻ trứng, và chu trình bắt đầu lại.

Hiện tại đơn chủ động

Band 6.5 – 5 sentences

1

Chu trình bắt đầu khi những quả trứng nhỏ được đẻ trên lá dâu, chúng nở (hatch) trong vòng khoảng mười ngày.

Mệnh đề when (bị động) + mệnh đề which (chủ động)
2

Tiếp theo đó, ấu trùng, hay tằm, ăn lá dâu trong bốn đến sáu tuần, trong thời gian đó (during which time) chúng lớn rất nhanh.

Hiện tại đơn chủ động + during which time
3

Chuyển sang giai đoạn thứ hai, con tằm nhả tơ làm kén (spins a cocoon) từ một sợi tơ duy nhất trong ba đến bốn ngày.

Hiện tại đơn chủ động: spins
4

Bên trong kén, con tằm phát triển thành nhộng, một giai đoạn kéo dài (lasts) khoảng hai tuần.

Hiện tại đơn chủ động + cụm danh từ tóm tắt (a stage which …)
5

Ở giai đoạn cuối, một con bướm trưởng thành chui ra (emerges) khỏi kén và đẻ trứng, vì vậy chu trình lặp lại.

Hiện tại đơn chủ động + so (kết quả)

Band 7.5 – 5 sentences

1

Chu trình bắt đầu với việc đẻ những quả trứng nhỏ trên lá dâu, những quả trứng này nở trong vòng khoảng (approximately) mười ngày.

Danh từ hoá + mệnh đề which
2

Sau đó, ấu trùng mới nở ăn lá dâu trong khoảng bốn đến sáu tuần, tăng kích thước (size) đáng kể.

Hiện tại đơn chủ động + V-ing chỉ kết quả
3

Chuyển sang giai đoạn thứ hai, ấu trùng đã lớn hoàn toàn tự bao bọc (encloses itself) trong một cái kén, nhả tơ từ một sợi duy nhất trong ba đến bốn ngày.

Hiện tại đơn chủ động + V-ing (cách thức)
4

Ẩn mình bên trong kén, nó trải qua quá trình biến thái (metamorphosis) thành nhộng trong khoảng hai tuần.

Mệnh đề rút gọn bị động (Concealed …) + Hiện tại đơn chủ động
5

Ở giai đoạn cuối, một con bướm trưởng thành xuất hiện và đẻ một lứa (batch) trứng mới, qua đó hoàn thành chu trình.

Hiện tại đơn chủ động + thereby V-ing

6Linker Practice

Part A: drag (or tap) the linkers into the gaps. Part B: translate using the linker in ( ).

Part A – Band 4.5 linkers (8 sentences)

Computer: drag a linker into a gap. Phone: tap a linker, then tap a gap. Tap a filled gap to empty it.

  1. , a female moth lays tiny eggs.
  2. The moth lays eggs mulberry leaves.
  3. , small silkworms come out.
  4. They eat leaves four to six weeks.
  5. the second part, the silkworm makes a cocoon.
  6. , the silkworm changes into a pupa.
  7. The moth comes out lays new eggs.
  8. , a moth comes out of the cocoon.

Part B – Translate with Band 4.5 linkers (5 sentences)

Use the linker in ( ) and follow the Tense note.

1

Đầu tiên (First), bướm tằm cái đẻ trứng trên lá dâu.

Hiện tại đơn chủ động
First, a female moth lays eggs on mulberry leaves.
2

Tiếp theo (Next), những con tằm nhỏ chui ra.

Hiện tại đơn chủ động
Next, small silkworms come out.
3

Sau đó (Then), con tằm làm một cái kén.

Hiện tại đơn chủ động
Then, the silkworm makes a cocoon.
4

Sau đó (After that), con tằm biến thành nhộng.

Hiện tại đơn chủ động
After that, the silkworm changes into a pupa.
5

Cuối cùng (Finally), một con bướm chui ra khỏi kén.

Hiện tại đơn chủ động
Finally, a moth comes out of the cocoon.

Part A – Band 5.5 linkers (8 sentences)

Computer: drag a linker into a gap. Phone: tap a linker, then tap a gap. Tap a filled gap to empty it.

  1. , tiny eggs are laid on mulberry leaves.
  2. The eggs hatch about 10 days.
  3. that, the young silkworms feed on leaves.
  4. The silkworms feed on leaves grow quickly.
  5. the second stage, the silkworm spins a cocoon.
  6. , inside the cocoon, it turns into a pupa.
  7. This stage about two weeks.
  8. , an adult moth breaks out of the cocoon.

Part B – Translate with Band 5.5 linkers (5 sentences)

Use the linker in ( ) and follow the Tense note.

1

Trước tiên (To begin with), trứng được đẻ trên lá dâu.

Hiện tại đơn bị động
To begin with, eggs are laid on mulberry leaves.
2

Trứng nở sau (after) khoảng 10 ngày.

Hiện tại đơn chủ động
The eggs hatch after about 10 days.
3

Ở giai đoạn thứ hai (In the second stage), con tằm nhả tơ làm kén.

Hiện tại đơn chủ động
In the second stage, the silkworm spins a cocoon.
4

Tiếp theo (Next), nó biến thành nhộng bên trong kén.

Hiện tại đơn chủ động
Next, it turns into a pupa inside the cocoon.
5

Cuối cùng (Finally), bướm trưởng thành đẻ trứng.

Hiện tại đơn chủ động
Finally, the adult moth lays eggs.

Part A – Band 6.5 linkers (8 sentences)

Computer: drag a linker into a gap. Phone: tap a linker, then tap a gap. Tap a filled gap to empty it.

  1. The cycle begins tiny eggs are laid on mulberry leaves.
  2. The eggs are laid on leaves, hatch within ten days.
  3. The larvae, silkworms, feed on mulberry leaves.
  4. They feed for six weeks, during which they grow rapidly.
  5. the second phase, the silkworm spins a cocoon.
  6. The cocoon is spun a single silk thread.
  7. It develops into a pupa, a stage lasts about two weeks.
  8. , an adult moth emerges from the cocoon.

Part B – Translate with Band 6.5 linkers (5 sentences)

Use the linker in ( ) and follow the Tense note.

1

Chu trình bắt đầu khi (when) trứng được đẻ trên lá dâu.

Hiện tại đơn chủ động + mệnh đề when (bị động)
The cycle begins when eggs are laid on mulberry leaves.
2

Trứng được đẻ trên lá, những quả trứng này (which) nở sau mười ngày.

Hiện tại đơn bị động + mệnh đề which
The eggs are laid on leaves, which hatch after ten days.
3

Tằm ăn lá trong sáu tuần, trong thời gian đó (during which time) chúng lớn nhanh.

Hiện tại đơn + during which time
The silkworms eat leaves for six weeks, during which time they grow quickly.
4

Chuyển sang (Turning to) giai đoạn thứ hai, con tằm nhả tơ làm kén.

Hiện tại đơn chủ động
Turning to the second phase, the silkworm spins a cocoon.
5

Bướm đẻ trứng của chính nó, vì vậy (so) chu trình lặp lại.

Hiện tại đơn chủ động + so
The moth lays its own eggs, so the cycle repeats.

Part A – Band 7.5 linkers (8 sentences)

Computer: drag a linker into a gap. Phone: tap a linker, then tap a gap. Tap a filled gap to empty it.

  1. The cycle commences the laying of tiny eggs.
  2. The eggs hatch within ten days.
  3. , the newly hatched larvae feed on mulberry leaves.
  4. The larvae feed on leaves, considerably in size.
  5. The fully grown larva itself in a cocoon.
  6. within the cocoon, it changes into a pupa.
  7. It undergoes into a pupa.
  8. The moth lays a new batch of eggs, completing the cycle.

Part B – Translate with Band 7.5 linkers (5 sentences)

Use the linker in ( ) and follow the Tense note.

1

Chu trình bắt đầu với (commences with) việc đẻ trứng trên lá dâu.

Hiện tại đơn chủ động + danh từ hoá
The cycle commences with the laying of eggs on mulberry leaves.
2

Sau đó (Subsequently), ấu trùng mới nở ăn lá dâu.

Hiện tại đơn chủ động
Subsequently, the newly hatched larvae feed on mulberry leaves.
3

Ấu trùng ăn lá, tăng (increasing) kích thước đáng kể.

Hiện tại đơn chủ động + V-ing chỉ kết quả
The larvae eat leaves, increasing considerably in size.
4

Ẩn mình (Concealed) trong kén, nó biến thành nhộng.

Rút gọn bị động + Hiện tại đơn
Concealed within the cocoon, it changes into a pupa.
5

Bướm đẻ trứng mới, qua đó (thereby) hoàn thành chu trình.

Hiện tại đơn chủ động + thereby V-ing
The moth lays new eggs, thereby completing the cycle.

7Introduction – Paraphrasing the Task

Paraphrase the task sentence. The column of your band is highlighted.

Task wordsBand 4.5Band 5.5Band 6.5Band 7.5
The diagram below showsThe diagram showsThe diagram illustratesThe diagram illustratesThe given diagram depicts
the life cyclethe life cyclethe stages in the lifethe different stages in the life cyclethe successive stages in the life cycle
of the silkwormof a silkwormof a silkwormof a silkwormof the silkworm
(the whole cycle)from a small egg to an adult mothfrom the egg stage to an adult mothfrom the laying of eggs to the emergence of an adult mothtracing its development from a tiny egg to a mature, egg-laying moth
Tip: “silkworm” must be kept; “larva”, “cocoon”, “pupa” and “moth” are the technical words of the cycle – use them correctly.
Sample Introduction – Band 4.5

The diagram shows the life cycle of a silkworm, from a small egg to an adult moth that lays new eggs.

Band 4.5: copies the task words and adds a simple from … to … phrase.

Sample Introduction – Band 5.5

The diagram illustrates the stages in the life of a silkworm, from the egg stage to an adult moth.

Band 5.5: a common reporting verb (illustrates), a simple noun phrase (the stages in the life) and a clear range.

Sample Introduction – Band 6.5

The diagram illustrates the different stages in the life cycle of a silkworm, from the laying of eggs to the emergence of an adult moth.

Band 6.5: a clear noun phrase and nominalisation (the laying of eggs, the emergence of an adult moth).

Sample Introduction – Band 7.5

The given diagram depicts the successive stages in the life cycle of the silkworm, tracing its development from a tiny egg to a mature, egg-laying moth.

Band 7.5: precise verb (depicts), an academic noun phrase, a participle clause (tracing its development …) and a compound adjective (egg-laying).

Template for students

The diagram shows / illustrates / depicts the life cycle / the stages in the life of the silkworm, from a tiny egg / the laying of eggs to an adult moth.

8Overview

An overview gives the number of stages and the start and end; higher bands add the two main phases in more precise language. No details (no “10 days”, “4–6 weeks”, “3–4 days”, “2 weeks” or “mulberry leaves”).

Band 4.5 formula

Overall, there are number steps in this process. It starts with V-ing / N and finishes with V-ing / N.
Example – Band 4.5

Overall, there are five steps in this life cycle. It starts with eggs on mulberry leaves and finishes with a moth laying new eggs, so it is a cycle.

Why Band 4.5: Two short simple sentences, basic words (steps, starts, finishes), no phases.

Band 5.5 formula

Overall, there are number stages in the process. The first number stages happen place / phase A, and the last number happen place / phase B. The process begins with V-ing and ends with the + N of + N.
Example – Band 5.5

Overall, there are five stages in the life cycle. The first two stages show the egg and the young silkworm, and the last three show the cocoon and the adult moth. The cycle begins with eggs being laid on mulberry leaves and ends with an adult moth laying eggs, so it is a cyclical process.

Why Band 5.5: Names the two parts in simple words; begins with … ends with …; no numbers or details.

Band 6.5 formula

Overall, there are number stages in the process, which can be divided into two main phases: A and B. The process begins with the + N of + N and ends with the + N of + N.
Example – Band 6.5

Overall, there are five stages in the life cycle, which can be divided into two main phases: the egg and feeding stage, and the cocoon and adult stage. The cycle begins with the laying of eggs on mulberry leaves and ends with adult moths producing eggs of their own, so it is a cyclical process.

Why Band 6.5: A which-clause divides the stages into two phases; nominal phrases (the harvesting of, the production of).

Band 7.5 formula

Overall, the process comprises number + distinct stages, which fall into two main phases – A and B – commencing with the + N of + N and culminating in the + N of + N.
Example – Band 7.5

Overall, the life cycle comprises five distinct stages, which fall into two main phases – hatching and feeding, and cocoon formation and adulthood – commencing with the laying of eggs on mulberry leaves and culminating in the emergence of an adult moth, from where the cycle repeats.

Why Band 7.5: comprises · distinct · fall into · dashes for the phases · commencing with … culminating in … in ONE sentence.

9Writing Practice

Essay plan: Introduction → Overview → Body 1: Stages 1–2 (Egg and feeding silkworm) → Body 2: Stages 3–5 (Cocoon and adult moth). Your writing is saved on this device.

Exercise 1 – Match the paraphrase

Choose the best synonym for each word from the task.

  1. shows →
  2. life cycle →
  3. silkworm →
  4. adult →
  5. below →

Exercise 2 – Choose the best Overview

Which sentence is a good overview?

Why? A gives details – these belong in the Body. C adds information that is not in the diagram. B gives the number of stages, the two phases, the start and end, and says it is cyclical.

Exercise 3 – Complete Body 1 (Band 4.5)

Type ONE word in each gap. Look at the diagram for the details.

First, a female moth lays tiny on mulberry leaves. The eggs after about 10 days. Next, small silkworms come out and mulberry leaves for four to six . During this time, they grow very .

Exercise 4 – Put Body 2 in order (Band 4.5)

Choose 1–4 for each sentence.

Finally, a moth comes out of the cocoon and lays new eggs, so the cycle starts again.
The new eggs are also put on mulberry leaves.
In the second part, the silkworm makes a cocoon from silk in three to four days.
After that, the silkworm changes into a pupa inside the cocoon for about two weeks.

Exercise 3 – Complete Body 1 (Band 5.5)

Type ONE word in each gap. Look at the diagram for the details.

To begin with, tiny eggs are on mulberry leaves, and they after about 10 days. After that, the young silkworms on mulberry leaves for four to six and grow .

Exercise 4 – Put Body 2 in order (Band 5.5)

Choose 1–3 for each sentence.

In the second stage, the silkworm spins a silk cocoon around itself in three to four days.
Finally, an adult moth breaks out of the cocoon and lays eggs, and the cycle begins again.
Next, inside the cocoon, it turns into a pupa, and this stage lasts about two weeks.

Exercise 3 – Complete Body 1 (Band 6.5)

Type ONE word in each gap. Look at the diagram for the details.

The cycle begins tiny eggs are laid on mulberry leaves, hatch within about ten days. Following this, the larvae, silkworms, feed on mulberry leaves for four to six weeks, during which time they grow . This feeding stage is the part of the cycle.

Exercise 4 – Put Body 2 in order (Band 6.5)

Choose 1–3 for each sentence.

In the final stage, an adult moth emerges from the cocoon and lays its own eggs, so the cycle repeats.
Turning to the second phase, the silkworm spins a cocoon from a single silk thread over three to four days.
Inside the cocoon, the silkworm develops into a pupa, a stage which lasts about two weeks.

Exercise 3 – Complete Body 1 (Band 7.5)

Type ONE word in each gap. Look at the diagram for the details.

The cycle commences with the of tiny eggs on mulberry leaves, which hatch within ten days. Subsequently, the newly hatched feed on mulberry leaves for a of four to six weeks, considerably in size.

Exercise 4 – Put Body 2 in order (Band 7.5)

Choose 1–3 for each sentence.

In the final stage, an adult moth emerges and lays a new batch of eggs, thereby completing the cycle.
Concealed within the cocoon, it undergoes metamorphosis into a pupa over roughly two weeks.
Turning to the second phase, the fully grown larva encloses itself in a cocoon, spinning it from a single silk thread over three to four days.

Write your essay – paragraph by paragraph

Use the Band 6.5 formulas, linkers and samples from Steps 3–8. Check the Band Standard on the left before you write.

Exercise 5 – Introduction

One sentence. Paraphrase the task (Step 7).

Words: 0 (about 20–30 words)

Exercise 6 – Overview

Use the formula for your band (Step 8).

Words: 0 (about 25–45 words)

Exercise 7 – Body 1 (Stages 1–2)

Write the stages in order with a different linker for each.

Words: 0 (about 55–75 words)

Exercise 8 – Body 2 (Stages 3–5)

Start with a phase change (In the factory / Turning to …).

Words: 0 (about 50–70 words)

Exercise 9 – Your full essay

Press “Collect my paragraphs”, then edit them into one essay and compare with the model.

Words: 0 (minimum 150)

Model Answer 6.5

Write your own essay first, then compare. Highlighted = key collocations to learn.

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