National Science Olympiad Forum By SOF Olympiad Trainer - Page 645
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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru
Subject :NSO    Class : Class 6

Ans 1:

Snigdha swaminath from Christ nagar higher secondary school , Trivandrum
Class : Class 7
D is right too right

Ans 2:

Deepesh Abhijeet Gurjar from Sulochana Natu Bharatiya Vidya Bhavan , Pune
Class : Class 9
Actually,water does not ''Precipitate'' to form clouds.As long as my memory tells me, water ''Condenses'' to form clouds.

Ans 3:

Kushagra Kishore from Chrysalis High, Bengaluru
Class : Class 10

Ans 4:

Deepesh Abhijeet Gurjar from Sulochana Natu Bharatiya Vidya Bhavan , Pune
Class : Class 9

Ans 5:

Aarush Goyal from D.A.V Pblic school, Sector 14, Faridabad
Class : Class 6
yes a is the correct answer

Ans 6:

Naman from Svm, Nalasopara
Class : Class 6
a is write

Ans 7:

Ryan Geo from Birla Public School, DOHA
Class : Class 7
As far as I know, raining (precipitating) does not yield clouds. condensation does.

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Aarush Singh from The Study Lecole Internationale, Puducherry
Subject :NSO    Class : Class 5

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru
Subject :NSO    Class : Class 6

Ans 1:

Aarush Goyal from D.A.V Pblic school, Sector 14, Faridabad
Class : Class 6
correct answer is B

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Chinmayi.D.S from Podar International School, Hassan
Subject :NSO    Class : Class 8

Ans 1:

karthik from , tirupur
Class : Class 8
Venus

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Nilanjana De from Delhi Public School North, Bengaluru
Subject :NSO    Class : Class 7

Ans 1:

Pari Shiddam from PIS Powai, MUMBAI
Class : Class 8
Senseless question, wrong question and totally different solution. I am disappointed as there are many mistakes.

Ans 2:

Aahana from St. Andrews School, Hyderabad
Class : Class 7
Wrong Question

Ans 3:

Ishan Patil from D.A.V. B.O.R.L. Public School ,Bina, Bina
Class : Class 9
Absolutely Right question matches with the image in question

Ans 4:

Koina Rautkar from DAV ispat sr sec public school , Dalli rajhara
Class : Class 7

Ans 5:

Daksh from RKC, Rajkot
Class : Class 8

Ans 6:

Adhrit from CHSV, Chennai
Class : Class 8
Completely wrong image in the question, it makes no sense

Ans 7:

Anusha from LBS School , Kota
Class : Class 10
Wrong question

Ans 8:

Arnav Nandan from ST PETERS COLLEGE AGRA, Agra
Class : Class 9
Wrong question. NICE

Ans 9:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
this is wrong . all the options are wrong .

Ans 10:

yash kirpalani from st gregorios high school chembur, Mumbai
Class : Class 7
none of the options are correct.

Ans 11:

PS Gour from Chirec international schoo The best 30 years and beyond, Hyderabad
Class : Class 7
this is wrong

Ans 12:

NIKHIL RANJAN from Litera Valley School, PATNA
Class : Class 7

Ans 13:

Harsh Kakaria from The creek planet school, Hyderabad
Class : Class 8
it is completely wrong

Ans 14:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
Firstly, the image itself is totally different from that of the options. None of the options actually fit the image. So, either there should be a "None of these" option or there should be a different image in which at least one option fits. I ask SOF to kindly make the needed changes.

Ans 15:

Pari Shiddam from PIS Powai, MUMBAI
Class : Class 8

Ans 16:

Neil Pathak from GD Goenka Public School, Paschiim Vihar, New Delhi
Class : Class 9
wrong ques

Ans 17:

Mahadevan from KV Rubber Board Kottayam, Kottayam
Class : Class 9
yes wrong ques

Ans 18:

AANYA BARANWAL from KPS SCHOOL, bhilai
Class : Class 5
wrong question

Ans 19:

Kushal from Chirec, Hyderabad
Class : Class 7

Ans 20:

Anuraaj Salunkhe from St Gregorios High School, Mumbai
Class : Class 10
None of the options are correct.

Ans 21:

Anshuman D from MVM, Hyderabad
Class : Class 9
It is meaningless

Ans 22:

Ahaan Pathak from Treamis World School, Bangalore
Class : Class 8
This question is absolutely wrong

Ans 23:

arnav raj sharma from gulibulium school, new york
Class : Class 8
THAT DOESN'T MAKES SENSE

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Gauri Chaturvedi from St. Joseph Convent, Jabalpur
Subject :NSO    Class : Class 6

Ans 1:

Aarush Goyal from D.A.V Pblic school, Sector 14, Faridabad
Class : Class 6
AN INSULATOR (C)

Ans 2:

VIJAYA SREYAS B from NARAYANA OLYMPIAD SCHOOL KUKATPALLY, HYDERABAD
Class : Class 6
Wood is a bad conductor of heat. This results in very slow heating of wood. This principle is used when we use wood utensils to cook food. I go by option (B).

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Mathangi Parthasarathi from ,
Subject :NSO    Class : Class 4

Ans 1:

Shreyansh Saha from Dps Megacity, Kolkata
Class : Class 6
Option D

Ans 2:

Aarav from SNBP, Pune
Class : Class 4
plants can release carbon dioxide at night only tulsi plant does not release carbon dioxide

Ans 3:

Nidhesh Agarwal from Chinmaya vidyalaya, Bokaro steel city
Class : Class 4

Ans 4:

Shaurya Srivastava from delhi public school, navi mumbai
Class : Class 6
how can a plant release carbondioxide???

Ans 5:

Aayush Reddy Bomidika from Delhi Public School Nacharam, Hyderabad
Class : Class 9

Ans 6:

Prakriti Singh from Ryan International School, Pune
Class : Class 4
D I guess,I am not sure

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Mrs Punita from Ramjas school R.K.Puram, New Delhi
Subject :NSO    Class : Class 7

Ans 1:

ARUNAV from DPS VINDHYANAGAR, VINDHYANAGAR
Class : Class 10
really confusing ... the answer option d is correct in the sense that produces means extracting the silk or when it is ready to extracted by humans. but option c is correct when produces means that when larva , itself after the fourth moult stage produces silk.

Ans 2:

Yashna Badiye from sagar public school saket nagar, Bhopal
Class : Class 8
no it is c

Ans 3:

Yashna Badiye from sagar public school saket nagar, Bhopal
Class : Class 8
as larva produces and when it is fully produced it forms a cocoon

Ans 4:

Aviral Yadu from Krishna Public School Dunda Raipur, Raipur
Class : Class 9
Ans C

Ans 5:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
I THINK THE ANSWER IS C

Ans 6:

Bhumi Chheda from SVKM J V Parekh International School, Mumbai
Class : Class 9
it is c because the silk has already started getting produces when it is larva

Ans 7:

Ronav Kerkar from Jamnabai Narsee School, Mumbai
Class : Class 7
admin please answer

Ans 8:

Hritvi from Podar International School, Mumbai
Class : Class 7
OPTION C

Ans 9:

Sanjaykumar S from Velammal, chennai
Class : Class 7
ans:c,you may think d,but only in larval stage it produce silk in option d it is in a cocoon stage it cannot produce silk

Ans 10:

Arushi from Indira National School, Pune
Class : Class 9
also felt d but explanation provided above makes me feel c

Ans 11:

reechik ghosh from dps, farakka
Class : Class 7

Ans 12:

Parth Gupta from Presidium Gurgaon, Gurgaon
Class : Class 8
answer is c because in the pupa stage the silk is already produced and in the larvae stage it produces silk when it is ready to go in the next stage of its life

Ans 13:

Krishna Patidar from Advanced Academy, Indore
Class : Class 8
No, the answer is 'C' only. In pupa stage the silk fiber is only obtained, but actually it is produced by larva and in question it is asked which stage produces fiber. Hence, the answer is 'C".

Ans 14:

Shlok from Tomoae , Amravati
Class : Class 7
it must be c . at cocoon stage silk is already produced

Ans 15:

Aayush Reddy Bomidika from Delhi Public School Nacharam, Hyderabad
Class : Class 9

Ans 16:

AARAV AGRAWAL from BIRLA DIVYA JYOTI, SILIGURI
Class : Class 8
This is a trick question.. It says 'produced', not 'obtained'.. The larvae produce the silk fibre, then it is obtained from cocoon..

Ans 17:

Shayan Bari from Kendriya Vidyalaya, Katihar
Class : Class 7
I thought the silk is obtained from the cocoon

Ans 18:

Ryan Ganguly from Ebenezer International School, Bangalore
Class : Class 8
The answer is C as at that time of a Silkworms life it will produce silk. With that silk they will make a cacoon and then they will become a Moth. While it is a Pupa it does not have the ability to make Silk hence the answer is C

Ans 19:

Mradul from Modern public school bhiwadi, Bhiwadi
Class : Class 7
IT IS 'D' BECAUSE AT COCOON STAGE THE CATERPILLAR PRODUCES SILK FIBRES AND KNOTS AROUND IT AND COVERS HIMSELF.AFTER SOME TIME THE SILK FIBRES GETS HARDEN DUE TO THE GUMMY SUBSTANCE WHICH THE CATERPILLAR PRODUCES............IT IS CALLED "FIBROIN" WHICH IS MADE UP OF PROTEINS.ON HEATING THE COCOONS IN WATER THE SILK AGAIN BECOMES SOFT AND IS EXTRACTED FROM COCOONS........THIS PROCESS IS CALLED "REELING OF SILK"

Ans 20:

D VISHNU from NARAYANA SCHOOL, CHENNAI
Class : Class 7
the answer is d only in the cocoon stage they are heated in the hot water so that the reproducing caterpillar will die and it will be very easy to extract silk fiber from it.

Ans 21:

Ashwak from Cambridge, Jalandhar
Class : Class 9
Answer should be C ,as only larvae in the life cycle of moth produce silk fibres , pupa or cocoon does NOT make silk fibres . They only undergo change in stage IN the silk fibres. They do not have the ability to produce silk fibres !

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Ishan Sinha from Navrachana School Sama, Vadodara Gujarat
Subject :NSO    Class : Class 6

Ans 1:

Rohan TR from Sri Aurobindo memorial school, Bangalore
Class : Class 6
@Aditya Kumble Same

Ans 2:

Aadvik saini from Mvn sector 17, Faridabad
Class : Class 8
c

Ans 3:

Aarush Goyal from D.A.V Pblic school, Sector 14, Faridabad
Class : Class 6
C

Ans 4:

Pratyush Pranjal Rai from GRM, Bareilly
Class : Class 7
CEZY PZY LEMONS SQUEEZY PIZA CHEEZY

Ans 5:

Adithya Kumble from Deens Academy, Bangalore
Class : Class 7
how dumb am i thought c wrote d

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Swati from Ryan, Bengaluru
Subject :NSO    Class : Class 8

Ans 1:

from DPS R.K. PURAM,
Class : Class 9

Ans 2:

Het Aryan from Podar International School , Pune
Class : Class 9
The correct answer is B.

Ans 3:

Chatresh ramasai gudi from Bgsnps , Bangalore
Class : Class 8

Ans 4: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
The correct answer is B.

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