Class 8 English Chapter 5 Science and Curiosity (New Course)

Key Concept: Advice-giving, Dialogue Writing

a) Advise creating a detailed study schedule
[Solution Description] To effectively advise a friend on preparing for an inter-class quiz, a recommended strategy is to suggest a structured study plan that covers all essential topics related to Chandrayaan-3. This might include breaking down the syllabus into key areas such as mission objectives, technological advancements, historical context, and recent developments. Encourage the use of various resources like online articles, documentaries, and practice quizzes. Additionally, advising regular revision sessions and group discussions with peers will help reinforce knowledge and address any gaps in understanding.

Key Concept: Scientific Contributions, Legacy

d) Inspirational influence on recent ISRO missions
[Solution Description] Bibha Chowdhuri’s discovery of pi-mesons marked a crucial advancement in high-energy particle physics, setting an inspiring precedent for future generations. Her role as a pioneer paved the way for women in India’s space program, which includes achievements like the Mars Orbiter Mission and Chandrayaan-3. Women scientists today draw inspiration from her legacy, echoing her perseverance and excellence in their own groundbreaking projects within ISRO.

Key Concept: Geographical Spread

b) Chennai
[Solution Description] Maharaja Sawai Jai Singh II commissioned five Jantar Mantar observatories located in New Delhi, Jaipur, Ujjain, Mathura, and Varanasi. Cities outside this list do not host these specific observatories.

Key Concept: Introduction to National Awards in Science, Technology, and Innovation

Correct answer c) To acknowledge significant contributions in science and technology.
[Solution Description] The Rashtriya Vigyan Puraskar aims to recognize significant contributions in science, technology, and innovation across India. This includes lifetime achievements, distinguished contributions, initiatives by young scientists, and collaborative team efforts, promoting further advancements within these fields.

Key Concept: Discussion on pets, Psychological and practical reasons for having pets in space, Alarm system failure

a) Claribel demonstrates how animals can act as companions and alert systems, surpassing technological limits.
[Solution Description] In Arthur C. Clarke’s “Feathered Friend,” Claribel the canary serves as an unexpected but effective backup to the space station’s alarm system. This highlights two main points: First, from a psychological perspective, having a pet like Claribel provides companionship and reduces isolation in the confined environment of a space station. Second, practically speaking, Claribel acts as a natural gas detector; her sensitivity to environmental changes is more reliable than technology, as demonstrated when she alerts the crew to a malfunction that the electronic systems missed. Thus, Claribel exemplifies both emotional support and functional utility.

Key Concept: Migratory birds avoiding storms

c) Atmospheric and environmental cues
[Solution Description] Migratory birds have an innate ability to detect atmospheric changes and environmental cues, allowing them to adjust their routes to dodge impending storms effectively.

Key Concept: Work on Cosmic Rays, Time Dilation, Academic Journey

b) 7.09
[Solution Description]
Time dilation can be calculated using the Lorentz factor $\gamma$, which is defined as:
$\gamma = \frac{1}{\sqrt{1 – v^2/c^2}}$
Given: $v = 0.99c$
Substitute $v$ in the equation:
$\gamma = \frac{1}{\sqrt{1 – (0.99)^2}} = \frac{1}{\sqrt{1 – 0.9801}} = \frac{1}{\sqrt{0.0199}}$
Simplifying further:
$\gamma \approx \frac{1}{0.141} \approx 7.09$
Thus, the time dilation factor is approximately 7.09.

Key Concept: Claribel’s role, Canary as an indicator

c) She served as an early detection system for air quality issues.
[Solution Description] Claribel’s fainting incident led to the discovery of a malfunction in the air purifier. This situation mirrors historical uses of canaries in mines for detecting gas leaks, showcasing their sensitivity to air quality. By fainting due to poor air conditions, Claribel unintentionally alerted the crew to the potentially hazardous environment aboard the space station, serving as an early warning system.

Key Concept: Legacy and Recognition, Impact on Women in STEM

b) Her recognition, including naming a star after her, inspires continued pursuit of science
[Solution Description] Bibha Chowdhuri’s legacy is embodied in her enduring influence on generations of women scientists. Her trailblazing achievements and recognition, such as having a star named after her in the constellation Leo by the International Astronomical Union, serve as symbolic acknowledgments of her contributions. Additionally, the establishment of a chair professorship in her name by the Government of India in 2020 signifies official recognition of her impact. These honors reinforce the narrative of perseverance and excellence in science, encouraging young women to pursue similar paths and break existing barriers in STEM fields. Her life’s work continues to inspire women scientists involved in significant projects like ISRO’s Mars Orbiter Mission and Chandrayaan-3, reflecting her lasting impact.

Key Concept: Future Time Reference, Direct & Indirect Speech

d) She said that she would have completed her project by the following week.
[Solution Description] To convert this sentence from direct to indirect speech, we must change the tense and pronouns appropriately. The future perfect tense “will have completed” changes to “would have completed” in reported speech. Personal pronoun “I” changes to “she.” Therefore, the indirect speech is: She said that she would have completed her project by the following week.

Key Concept: Pioneer Status, Challenges Faced, Legacy

c) Groundbreaking research on cosmic rays and Nobel Prize nomination amid societal challenges.
[Solution Description] Bibha Chowdhuri’s status as a pioneer in science is rooted in several aspects:
– Her groundbreaking research on cosmic rays amidst the minimal presence of women in science during her era.
– The acknowledgment from renowned physicist Erwin Schrödinger, who nominated her for a Nobel Prize.
These factors, despite the societal challenges she encountered, highlighted her pioneering role in Indian science.

Key Concept: Claribel’s status among the crew, Implications of having a canary

c) Required innovative hiding methods from officials
[Solution Description] Despite Claribel’s thriving condition and popularity among the crew, her presence posed challenges during VIP visits since regulations likely prohibited non-essential organisms due to contamination risks or resource limitations. The crew had to devise strategies to conceal her, reflecting broader implications about managing organic life in controlled environments. This underscores the balance between maintaining operational protocols and accommodating morale-boosting elements, emphasizing the complexity of habitat management in isolated settings.

Key Concept: Scientific curiosity and adaptation

d) His motivation uncovered Claribel’s quick adaptation to zero gravity, providing valuable data on animal behavior in space.
[Solution Description] Sven brought Claribel aboard due to his scientific curiosity regarding how animals would adapt to a microgravity environment. The discovery that Claribel adapted quickly and functioned normally despite the lack of gravity contributed insights into animal physiology and mobility in space, stressing the importance of studying living creatures in different environmental contexts.

Key Concept: Suffixes, Antonyms

c) Stranger
[Solution Description] Removing the suffix “-hood” from “neighborhood” leaves us with “neighbor.” In this context, a word that serves as an antonym could be “stranger,” since neighbors are known entities whereas strangers are not.

Key Concept: Impact of Observation Tools on Science

Correct Answer option b) They enable more precise and varied observations.
[Solution Description]
Advancements in observational tools, such as microscopes and telescopes, have significantly enhanced our ability to observe phenomena that were previously beyond our senses. These tools allow for precise measurements and observations, expanding our understanding of both micro and macro worlds and leading to discoveries and insights across various fields of science.

Key Concept: Discussion and Reflection, Imagery

d) To illustrate the proximity of great wonders through focus.
[Solution Description] Ending with the notion that the moon is within reach suggests that even distant or seemingly unattainable wonders can be brought closer through imagination and observation. This relates to the hidden beauty of nature by implying that everything holds potential for discovery when viewed with interest and care. The poem invites readers to look beyond what is immediately visible and consider the possibilities that lie just out of sight.

Key Concept: Legacy, Posthumous Honors, Metaphorical Influence

a) They highlight ongoing recognition of scientific pioneers
[Solution Description] The posthumous honors bestowed upon Bibha Chowdhuri, such as renaming a star as ‘Bibha’ and establishing a chair professorship in her name, embody the “beam of light” metaphor by permanently enshrining her achievements in history. These recognitions ensure that her pioneering spirit and dedication to science continue to illuminate and inspire current and future generations.
The metaphorical significance is analogous to a distant star whose light reaches us long after its origin, representing how her contributions remain influential beyond her lifetime. By shining light on her legacy, these honors affirm her role as an enduring source of motivation for aspiring scientists, particularly women, who see her story as a testament to the possibilities within reach.

Key Concept: Institutional Involvement

b) Tata Institute of Fundamental Research (TIFR)
[Solution Description] Upon her return to India, Bibha Chowdhuri was selected by Homi J. Bhabha as the first woman faculty member at the Tata Institute of Fundamental Research (TIFR).

Key Concept: Poem Analysis, Observation Activities, and Vocabulary and Language

b) “Magic talk”
[Solution Description] The phrase “Magic talk” personifies the magnifying glass as speaking or revealing secrets, thus highlighting the theme of discovery and wonder. It emphasizes how tools like magnifying glasses allow us to see beyond ordinary perception, making exploration feel magical and engaging.

Key Concept: Perception and Environmental Adaptation

b) Time is perceived by counting sleep-wake cycles.
[Solution Description]
The perception of time in space can be challenging due to the absence of natural day-night cycles. In “Feathered Friend,” the narrator describes feeling like it is 6:00 a.m. despite there being no actual sunrise or sunset in space. This indicates that even though there’s constant sunlight, astronauts typically rely on artificial means or internal clocks to simulate Earth’s time patterns, leading to a discrepancy between perceived and actual time.

Key Concept: Bibha Chowdhuri’s Achievements

b) Discovery of pi-mesons
[Solution Description] One of Bibha Chowdhuri’s significant contributions to science includes her work on cosmic rays and the discovery of pi-mesons.

Key Concept: Discussion Points

b) It enhances their friendship through deepened mutual understanding.
[Solution Description] Toby’s ability to see beyond physical barriers symbolizes insight and understanding, enriching his relationship with Monika. It allows them to connect on a deeper level, facilitating significant cultural exchange and mutual respect despite their differences.

Key Concept: Themes and Attitudes, Conclusion and Reflection

c) Curiosity; desire to explore the unknown
[Solution Description] The conclusion reflects an attitude of awe and curiosity towards nature and observation. The concept of the moon being within reach symbolizes the potential to explore and understand the universe at a deeper level when aided by tools like the magnifying glass. This underscores the speaker’s gratitude for the ability to see beyond the surface and appreciate the complexities of the natural world.

Key Concept: Government Recognition and Influence

b) It encourages leadership roles in scientific research.
[Solution Description]
Establishing a chair professorship in Bibha Chowdhuri’s name aims to continue her legacy by promoting academic excellence and encouraging more women to pursue advanced studies in science. It acknowledges her achievements and inspires future generations by providing a platform for innovation and leadership in scientific research, thus helping to break barriers for women in this field.

Key Concept: Concealment Challenges, Space Station Routine

a) They muffled her cage; strict watch rotations revealed her through loud sounds.
[Solution Description]
Concealing a pet like Claribel required careful planning, especially given her potential to make noise that could attract attention. The crew had to manage shifts and timekeeping meticulously, ensuring someone was always available to silence her if necessary. However, since the space station operated on twelve-hour watches and lacked a natural day-night cycle, fatigue or scheduling errors could occur, increasing the risk of discovery during high-profile visits when everyone needed rest or was distracted by tasks.

Key Concept: Introduction to Bibha Chowdhuri’s Life

c) High-Energy Particle Physics
[Solution Description] Bibha Chowdhuri was India’s first woman physicist and a trailblazer in high-energy particle physics. Her contributions in this domain were significant, especially during a time when the field was dominated by men.

Key Concept: Bibha Chowdhuri’s Scientific Contributions

c) Bibha Chowdhuri
[Solution Description] Bibha Chowdhuri is known for her discovery of pi-mesons, which are important subatomic particles in physics.

Key Concept: Āryabhaṭa’s Heliocentric Model, Explanation of Eclipses

b) The Earth’s shadow falling on the Moon
[Solution Description]
According to Āryabhaṭa, a lunar eclipse occurs when the Earth’s shadow falls on the Moon. In his heliocentric model, he proposed that the Earth casts a shadow because it is positioned between the Sun and the Moon during the lunar eclipse. The alignment causes the Earth’s shadow to cover the Moon, obscuring its view from the earth.

Key Concept: Role Analysis, Crew Safety

b) Her reaction emphasized the need for diversified safety alerts.
[Solution Description] Claribel’s presence aboard serves as a critical point of analysis regarding the existing safety measures at the space station. Her ability to alert the crew to the failure of the air purifier system demonstrates how dependent the team is on non-technological means for survival. The incident points out the lack of redundancy in the alarm systems designed purely on electronic feedback mechanisms. It suggests that the integration of biological systems with artificial ones could provide an extra layer of security, ensuring crew safety even when technical faults occur unnoticed.

Key Concept: Societal Context, Educational Journey

a) Supportive family environment
[Solution Description] Bibha Chowdhuri was born in 1913 in Kolkata, a period when societal expectations were largely restrictive for women. Her family’s support and encouragement played a crucial role in shaping her scientific ambitions despite societal constraints. This familial backing provided her with the strength and determination needed to challenge conventional gender roles and excel in high-energy particle physics, an area dominated by men.

Key Concept: Introduction to scientific curiosity, absence of regulations

a) To test the limits of animal life in space
[Solution Description] In the narrative, Sven Olsen, a construction worker aboard the space station, sneaks a canary named Claribel into the station due to his curiosity about her ability to adapt to microgravity and how she might interact with the space environment. Since there were no explicit rules concerning pets in the space station, Sven used this regulatory gap as an opportunity to explore beyond formal boundaries, driven purely by a sense of scientific inquiry. His actions show that, in the absence of rigid rules, curiosity can motivate individuals to experiment, which can lead to novel insights and practical applications such as uncovering hidden dangers like gas leaks.

Key Concept: Crew Perception Change, Humorous Science Fiction

a) From an amusing pet to a vital member aiding in safety procedures
[Solution Description]
Initially, Claribel was regarded by the crew merely as a pet—a companion brought aboard by Sven without formal permission. However, following the incident where Claribel’s presence potentially averted a disaster, the crew’s perception shifted significantly. They began to see her as more than just a pet, acknowledging her importance and integrating her into their operational safety considerations. This shift reflects the humor inherent in science fiction tales: an innocent element unexpectedly becomes crucial, subverting the audience’s expectations and highlighting the unpredictable nature of life, even in highly controlled environments like space.

Key Concept: Characteristics of Claribel, zero-gravity adaptation, and impact on crew

c) Integration within a community enhances collective adaptability to challenging environments.
[Solution Description] Claribel, a lightweight bird with minimal food requirements, easily adapts to the zero-gravity environment of the space station. Her adjustment symbolizes the broader theme of adaptability and resilience inherent in living beings. Her presence also fosters camaraderie among the crew members, indicating how shared experiences in adapting to new environments can strengthen bonds within a community.

Key Concept: Early Life and Education, Academic Journey

c) 32
[Solution Description]
To find out how many years after her birth Bibha Chowdhuri began her Ph.D., we subtract the year of her birth from the year she started her Ph.D.
Let $B = 1913$ be the year of her birth and $P = 1945$ be the year she started her Ph.D.
The number of years after birth is calculated as:
$P – B = 1945 – 1913 = 32$
Therefore, Bibha Chowdhuri started her Ph.D. 32 years after her birth.

Key Concept: Role of Women in STEM

b) Mars Orbiter Mission
[Solution Description] Dr. Ritu Karidhal Srivastava played a crucial role in India’s Mars Orbiter Mission, making significant contributions to ISRO’s advancements and earning her the title ‘Rocket Woman of India.’

Key Concept: Ancient Astronomers, Heliocentric Model

c) They happen when the Earth obstructs sunlight from reaching the Moon.
[Solution Description]
In Āryabhaṭa’s heliocentric model, he proposed that lunar eclipses occur when the Earth comes directly between the Sun and the Moon, casting its shadow on the Moon. This explanation was revolutionary at the time, providing a scientific basis for understanding eclipses rather than attributing them to supernatural causes.

Key Concept: Impact and Recognition Posthumously, Societal Perception

b) Renaming a star in her name
[Solution Description] Posthumously, Bibha Chowdhuri’s legacy as a pioneering female scientist was honored by the International Astronomical Union (IAU), which renamed a star in her memory. This gesture not only recognized her contributions to science but also served as a symbolic acknowledgment of the impact she had in inspiring future generations of women scientists. It reflects how societal perceptions have evolved to appreciate and commemorate the invaluable contributions of women like her in science.

Key Concept: Merged Words, Suffix Practice -ship, -ment, -hood

c) Webinar; Membership
[Solution Description] The word “webinar” is a portmanteau formed by combining “web” and “seminar”, signifying a seminar conducted online. For the suffix practice, adding “-ship” to “member” forms the noun “membership,” which denotes belonging to a group.

Key Concept: Psychological and Practical Reasons for Animals in Space, Sven Olsen’s Experience

a) It illustrates animals’ ability to detect environmental changes while providing needed companionship.
[Solution Description] Sven Olsen chose a canary as his pet while working on a space station. This decision highlights both psychological and practical reasons for having animals in such environments. Psychologically, the presence of a familiar living creature provides companionship and emotional support, reducing feelings of isolation in the confined and artificial setting of a space station. Practically, a canary serves as an early warning system, detecting potential dangers like air quality issues due to its sensitivity to atmospheric changes. Hence, his choice demonstrates the dual role by addressing emotional needs and offering a functional safety measure, combining companionship with survival functions.

Key Concept: Back Clipping, Identifying Clipped Words

a) gator
[Solution Description] The method of back clipping involves removing the end part of a word and retaining its front part. In this case, ‘gator’ is formed by clipping the end of ‘alligator’, leaving only the initial segment.

Key Concept: Imagery, Poetic Themes, Thematic Shift

c) It draws parallels between the terrestrial and the celestial
[Solution Description] Imagery creates a bridge between the tangible and the mystical, highlighting how detailed observation can elevate ordinary items to extraordinary status. This serves the thematic shift by showing the continuity between earthly details and celestial grandeur, emphasizing interconnectedness and vastness in perception.

Key Concept: Elevation and Observatory Features

b) High elevation provides exceptional observational conditions.
[Solution Description]
Mauna Kea’s elevation is 4,205 meters (13,796 feet), providing outstanding observational conditions due to high elevation, dry environment, and stable airflow. This combination allows for significant improvements in optical, infrared, and submillimeter astronomy because of reduced atmospheric interference.
Among the options, option b) captures the importance related to Mauna Kea Observatory’s features accurately.

Key Concept: Visual Aids for Low Vision, Writing Conversations

a) “I love using magnifying spectacles; they’re perfect for reading books, allowing me to keep my hands free.”
[Solution Description] To solve this, we need to understand both the functionality of the visual aids and how they can be woven into a conversational setting. Magnifying spectacles are best suited for close-up tasks such as reading or threading a needle, where hands-free operation is beneficial. Hand-held magnifiers, especially those with built-in lights, facilitate movement across printed materials, providing flexibility. In a dialogue, including filler words or emotions enhances engagement. An effective statement might have one friend expressing enthusiasm about using magnifying spectacles for reading books effortlessly, while the other admires the versatility of hand-held magnifiers for scanning documents in varying light conditions.

Key Concept: Report Writing, Contextual Understanding and Detail Inclusion

a) Highlighting the Chief Guest’s positive remarks about the exhibits’ creativity and innovation
[Solution Description] In a report on a school-hosted Zonal Science Exhibition, focusing on the Chief Guest’s observations is critical as it provides external validation of the event’s success. The report should succinctly capture the Chief Guest’s remarks on the quality of exhibits, student involvement, and the educational value of the event. These details help emphasize the impact of the exhibition on participants and attendees, offering a credible perspective on the achievements showcased during the event.

Key Concept: Adaptation to Environment, Scientific Curiosity

b) To monitor her condition as a biological air quality sensor.
[Solution Description] Sven Olsen’s primary scientific curiosity about Claribel was observing how a bird would behave in a zero-gravity environment. He was interested in understanding whether and how she could adapt to such conditions, which represented a novel study of animal behavior outside Earth’s gravitational influence. The significant discovery resulting from her presence was the detection of the air purifier malfunction. Claribel’s unusual behavior underlined her sensitivity to air quality changes, thus alerting the crew to a potentially life-threatening situation, emphasizing the intersection of curiosity-driven science and practical safety.

Key Concept: Collaboration, Integrity

c) Integrity involves honest communication and fair credit distribution, enhancing collaborative trust.
[Solution Description] Collaboration in science necessitates transparency, honesty, and ethical conduct—key components of integrity. Bibha Chowdhuri exemplified these qualities by engaging openly with colleagues, sharing credit fairly, and ensuring accuracy in reporting findings. Her ability to maintain integrity while collaborating fostered trust and respect among peers, essential for successful collective endeavors.

Key Concept: Rashtriya Vigyan Puraskar Awards Criteria, Teamwork Contributions

c) Three innovators working together on a single technological innovation
[Solution Description] The Vigyan Team (VT) Award requires that a team consists of three or more scientists/researchers/innovators who have made exceptional contributions while working together in any field of science and technology. The award specifically emphasizes teamwork in scientific endeavors.

Key Concept: Visual Imagery, Symbolism of the spider and the moon

d) They symbolize the depth and interconnectedness revealed through scrutiny
[Solution Description]
The poem uses rich visual imagery to transform everyday scenes into extraordinary spectacles, demonstrating the potential of focused observation. The spider is depicted weaving intricate webs, symbolizing meticulous artistry and the unseen connections in nature that become visible through careful examination.
The moon symbolizes enlightenment and clarity brought forth through the lens of the magnifying glass. Observing these phenomena closely reveals their complexity and beauty, reinforcing the idea that detailed observation transforms the observer’s understanding of the world.
Both symbols serve to communicate how close observation can uncover intricate details, altering one’s perception and appreciation of the natural environment.