Question Let us Discuss and Reflect
Explain why Claribel is brought to the space station and how she helps the crew.
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T
Answer
Sven brings Claribel out of curiosity. When she faints, she warns the crew about the failed air purifier.
CLASS 8 · POORVI · CHAPTER 5
Science and Curiosity
Original, student-friendly answers for Feathered Friend, Magnifying Glass, and Bibha Chowdhuri.
25 worked answersOriginal sample responses
25 worked answers · short steps first, explanations when you need them
Feathered Friend
Textbook pages NCERT Poorvi, Class 8
Question Let us Think and Reflect
What does the story show about science, teamwork, and unexpected ways to solve a problem?
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Answer
The canary’s behaviour reveals the air problem. Knowledge, observation, and teamwork solve it.
Question Let us Learn I–II
Match adjectives to nouns and form blended words.
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C
Answer
narrow path; nagging worry; vague plan; sheepish look; inexplicable reason; sluggish traffic; hushed voices; delighted expression. motel, smog, sitcom, vlog, spork, webinar. “Will” = future.
Question Let us Learn III–V
Complete the future-time activity using an appropriate verb form.
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U
Answer
leaves; will finish; will rain; are moving; am starting; is going; is having; will help. V: will have revolutionised; will be developing; will have transformed; opens; will assist; is.
Question Let us Write and Speak
Write a short dialogue about a science-fair project and give a reasoned opinion about taking an animal to space.
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Answer
Suggest a project, divide tasks, and ask for supervision. Any animal-in-space opinion should give a clear reason.
Question Before Reading I–II
Discuss what a feathered friend might be and complete the words by adding vowels.
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Think of a bird as a possible friend
Answer
A feathered friend is a bird. Word answers: regulation, forbid, fuse, abruptly, confess, dietitian.
Question Let us Discuss and Let us Think and Reflect
Mark the story statements true or false and answer the extract questions about Sven, Claribel, and the alarm failure.
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Check each claim against the plot
Answer
Statements: False, False, True, False, True, False, True. Claribel’s fainting and revival with oxygen reveal an air-purifier problem; the backup alarm was not connected.
Magnifying Glass
Textbook pages NCERT Poorvi, Class 8
Question Let us Think and Reflect
Explain how magnifying aids help people with low vision and give examples of different types.
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Answer
Spectacles and hand magnifiers help with close work; stand magnifiers remain in place; telescopes help with distant objects.
Question Let us Explore and Write
Suggest ways to make a classroom activity easier for a student who has low vision.
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Answer
Use enlarged high-contrast text, describe visuals, keep paths clear, and ask which aid the student prefers.
Question Magnifying Glass: Let us Write
Use a social-media web of internet uses to write a short article titled “The Importance of Internet”.
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The internet helps people learn, communicate, and use services. Check information, protect personal details, and use screen time responsibly.
Answer
The internet helps people learn, communicate, and use services. Check information, protect personal details, and use screen time responsibly.
Question Magnifying Glass: Let us Explore
Explain how you would make a shared classroom task accessible to a student with low vision.
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Use large or enlargeable text, describe images aloud, offer magnifying tools, and ask the student what helps.
Answer
Use large or enlargeable text, describe images aloud, offer magnifying tools, and ask the student what helps.
Question Let us Discuss and Let us Think and Reflect
Complete the poem summary and answer questions about its main idea, rhyme, images, and the magnifying glass.
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Follow what the lens reveals
Answer
Summary: magnifying glass, shells, moss, drop, bees, web-silk, spinnerets, moon. Main idea: close observation; tone: wonder; six stanzas of four lines; ABCB. The glass reveals tiny natural details and makes the speaker curious.
Question Let us Learn I–IV
Complete the vocabulary paragraph, match collective nouns, explain eye expressions, and form adjectives with -ish.
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Use each word once where it fits
Answer
Collectives: locusts, stars, trees, dancers, soldiers, ships. Eye phrases: precious, quickly, watch, ignore, agree, overall view. Common -ish adjectives: girlish, boyish, bookish.
Question Let us Speak, Let us Write and Let us Explore
Practise /f/ and /v/, give suggestions for the two situations, write the Science Club conversation, and explain what magnifying tools and telescopes do.
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Listen for the sound difference
Answer
For /f/ and /v/, practise the listed words and feel whether the throat vibrates. Give practical suggestions and explain the tool’s purpose. Telescopes help view distant objects; magnifiers support close work.
Bibha Chowdhuri
Textbook pages NCERT Poorvi, Class 8
Question Let us Think and Reflect
Summarise Bibha Chowdhuri’s contribution to science and explain why her work deserves recognition.
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Answer
She was an Indian physicist who studied cosmic rays. Her work and persistence deserve recognition.
Question Let us Speak and Write
Prepare a short introduction to an Indian scientist whose work interests you.
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Answer
Give the scientist’s field, one contribution, and why you find it meaningful.
Question Before Reading and Let us Discuss I
Suggest qualities of a scientist, discuss women scientists shown in the pictures, and place Bibha Chowdhuri’s life events in order.
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Describe habits that support discovery
Answer
Scientist qualities: curious, observant, patient, creative, and persistent. The pictured scientists are Kalpana Chawla (astronaut), Tessy Thomas (missile scientist), Ritu Karidhal (ISRO scientist), and Indira Hinduja (reproductive medicine). Timeline: 3, 5, 2, 6, 1, 4.
Question Let us Think and Reflect I–II
Answer the extract questions and explain Bibha Chowdhuri’s scientific work, recognition, and influence on women in STEM.
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Use details from her career
Answer
Bibha pioneered particle physics and cosmic-ray research. Her nomination shows the quality of her work; naming a star honours her literally and symbolically. Women have more opportunities today, though barriers remain.
Question Let us Learn I–VII
Solve the antonym and word-formation activities, identify acronyms, complete passive-voice tasks, and sequence the Chandrayaan passage.
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Use opposites and word roots
Answer
Antonyms: periphery, independent, ignite, cosmic/celestial, arduous, strength, care, significant. NASA, AIIMS, AYUSH, NIPER, WHO. Passive: were published, was discovered, was tested, were recorded, were taken, was measured. Chandrayaan: was launched, is positioned, is adjusted, is slowed down, is released.
Let us Listen, Speak and Explore
Textbook pages NCERT Poorvi, Class 8
Question Let us Listen, Speak and Explore
Answer the three Unit 5 activity sets: mark the four true statements in the Indian inventions conversation; answer the Toby listening questions and blanks; and choose responses for the AI podcast. Also prepare the speaking and writing samples in this unit.
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Inventions: true statements 1, 5, 6. Toby: all five statements true; blanks: people, Martians, energy, chocolates, one, clouds, metals. AI: 1(ii), 2(ii), 3(iii), 4(iii), 5(ii). Speaking and writing responses are samples.
Answer
Inventions: 1, 5, 6. Toby: all true; blanks: people, Martians, energy, chocolates, one, clouds, metals. AI: ii, ii, iii, iii, ii.
Question Bibha Chowdhuri: Let us Listen
Answer the five multiple-choice questions about the AI podcast.
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1(ii), 2(ii), 3(iii), 4(iii), 5(ii).
Answer
1(ii), 2(ii), 3(iii), 4(iii), 5(ii).
Question Feathered Friend: Let us Listen
Mark the five statements about Monika and Toby true or false, then complete the listening blanks.
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All five statements are true. Blanks: people; Martians; energy; chocolates; one; clouds; metals.
Answer
All five statements are true. Blanks: people; Martians; energy; chocolates; one; clouds; metals.
Question Magnifying Glass: Let us Speak
Write two short exchanges asking for and giving advice: one about building a solar-system model and one about preparing for a Chandrayaan-3 quiz.
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Model: use labelled models and a chart. Quiz: read reliable facts, make notes, and practise explaining the mission.
Answer
Model: use labelled models and a chart. Quiz: read reliable facts, make notes, and practise explaining the mission.
Question Feathered Friend: Let us Speak
Choose a planet to visit, explain why, describe your preparation, and name five things you would take.
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I would visit Mars to learn about its surface. I would train first and take a spacesuit, water, food, a communication device, and a first-aid kit.
Answer
I would visit Mars to learn about its surface. I would train first and take a spacesuit, water, food, a communication device, and a first-aid kit.
Question Feathered Friend: Let us Speak
Describe an invention you would like to create and explain how it would help.
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I would design a low-cost device that enlarges and reads text aloud, then test it with people with low vision.
Answer
I would design a low-cost device that enlarges and reads text aloud, then test it with people with low vision.