National Science Olympiad Forum By SOF Olympiad Trainer - Page 686
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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:

from ,
Class :
correct answer is B

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from ,
Subject :NSO    Class : Class 8

Ans 1:

from ,
Class :
Venus

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from ,
Subject :NSO    Class : Class 7

Ans 1:

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

Ans 2:

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 3:

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

Ans 4:

Kushal from Chirec, Hyderabad
Class : Class 7

Ans 5:

from ,
Class :
none of the options are correct.

Ans 6:

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

Ans 7:

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

Ans 8:

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

Ans 9:

Pari Shiddam from PIS Powai, MUMBAI
Class : Class 8

Ans 10:

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

Ans 11:

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

Ans 12:

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

Ans 13:

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

Ans 14:

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

Ans 15:

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

Ans 16:

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 17:

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

Ans 18:

from ,
Class :
THAT DOESN'T MAKES SENSE

Ans 19:

Daksh from RKC, Rajkot
Class : Class 8

Ans 20:

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 21:

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

Ans 22:

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

Ans 23:

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

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from ,
Subject :NSO    Class : Class 6

Ans 1:

from ,
Class :
AN INSULATOR (C)

Ans 2:

from ,
Class :
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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from ,
Subject :NSO    Class : Class 4

Ans 1:

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

Ans 2:

Shreyansh Saha from Dps Megacity, Kolkata
Class : Class 7
Option D

Ans 3:

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

Ans 4:

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

Ans 5:

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

Ans 6:

from ,
Class :
D I guess,I am not sure

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from ,
Subject :NSO    Class : Class 7

Ans 1:

from ,
Class :
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 2:

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 !

Ans 3:

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

Ans 4:

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 5:

from ,
Class :
I thought the silk is obtained from the cocoon

Ans 6:

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

Ans 7:

from ,
Class :
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 8:

from ,
Class :
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 9:

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

Ans 10:

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 11:

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

Ans 12:

reechik ghosh from dps, farakka
Class : Class 7

Ans 13:

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

Ans 14:

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 15:

from ,
Class :
as larva produces and when it is fully produced it forms a cocoon

Ans 16:

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

Ans 17:

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

Ans 18:

from ,
Class :
no it is c

Ans 19:

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 20:

from ,
Class :
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:

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

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

Ans 1:

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

Ans 2:

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

Ans 3:

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

Ans 4:

from ,
Class :
C

Ans 5:

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

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

Ans 1: (Master Answer)

from ,
Class :
The correct answer is B.

Ans 2:

Chatresh ramasai gudi from Bgsnps , Bangalore
Class : Class 8

Ans 3:

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

Ans 4:

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

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from ,
Subject :NSO    Class : Class 3

Ans 1:

MAYANK from Jain Public School, REWARI
Class : Class 9
B

Ans 2:

Riddhhima lalwani from Akshar, Kolkata
Class : Class 8

Ans 3:

Aadi Mukherjee from DPS, Durgapur
Class : Class 4

Ans 4:

KARTIK SHINDE from Delhi Public school Rau Indore , indore
Class : Class 4

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