National Science Olympiad Forum By SOF Olympiad Trainer - Page 651
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Pranathi Dindikurthi from Carmel School, Bangalore
Subject :NSO    Class : Class 6

Ans 1:

S SAHITHYAA RAMAN from Padma Seshadri T Nagar, Chennai
Class : Class 7
Answer is c

Ans 2:

RICHIK MOULIK from Oxebow English School, ASHOKNAGAR
Class : Class 6
B is the correct answer

Ans 3:

Himmat Singh from r.p.s school, Mohindergarh
Class : Class 7
The correct answer is b

Ans 4:

satwik patnaik from DPS Rourkela, Rourkela
Class : Class 7
answer is b

Ans 5:

Mihika Raut from ST JOSEPHS SCHOOL, RIHAND NAGAR
Class : Class 8
the correct answer is B

Ans 6:

Aaditya Vichare from St. John's Universal School, Mumbai
Class : Class 10
The answer is actually C because starch consists of carbohydrates and sugars, but sugars is not the exact answer.

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ABHAY AGARWAL from ,
Subject :NSO    Class : Class 4

Rohit performed an experiment wherein he set up three test tubes as shown in the figure. Select the INCORRECT statement regarding this.


ATest tube P will have most carbon dioxide after three hours.
BTest tube Q will have least oxygen after three hours.
COrganisms in test tube R will survive for a longer time as compared to organisms in test tubes P and Q.
DNo oxygen will remain in test tube P after some time.


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Ans 1:

Ibrahim Aslam from uttam, Ghaziabad
Class : Class 5

Ans 2:

avighna wuthoo from The bishop school , PUNE
Class : Class 7

Ans 3:

PARTH MEHTA from Navrachana school, Vadodara
Class : Class 6

Ans 4:

Ainesh das from Chrysalis, Bangalore
Class : Class 4

Ans 5:

Dishita Santosh Walujkar from Nutan English School, Kurduwadi
Class : Class 7
B

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ABHAY AGARWAL from ,
Subject :NSO    Class : Class 4

Ans 1:

Annlisa Castlia from BPS, HYD
Class : Class 5

Ans 2:

Navya from Doon, Chandigarh
Class : Class 4

Ans 3:

Satvik Agrawal from Delhi Public School, bhopal
Class : Class 5
why stomata?

Ans 4:

Annlisa Castlia from BPS, HYD
Class : Class 5
The correct answer is option D.

Ans 5:

adhiraj chaudhary from apeejay school noida, noida
Class : Class 3
the correct answer is d

Ans 6: (Master Answer)

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

Ans 7:

vivaan sethi from GD goenka public school, Delhi
Class : Class 4
Ans is D

Ans 8:

adhiraj chaudhary from apeejay school noida, noida
Class : Class 3

Ans 9:

Dishita Santosh Walujkar from Nutan English School, Kurduwadi
Class : Class 7
d

Ans 10:

Avyuktha S Kumar from Mt Litera Zee school, Mysuru
Class : Class 4
ans :d

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Sahasra Shanker from KV IIT, Chennai
Subject :NSO    Class : Class 6

Ans 1:

Winka Jayaprakash from Sri Vijay Vidyasharam , Hosur
Class : Class 9
the field line travels from north to south

Ans 2:

NEHA JOON from dps rohini , New delhi
Class : Class 8

Ans 3:

kpks14 from RIMT World School, Chandigarh
Class : Class 7

Ans 4:

Agustya vaid from Somerville school vasundhara enclave, Delhi
Class : Class 7
the answer is d because the field lines of a magnet always travle from north to south

Ans 5:

Veda Dua from Delhi Public School, R. K. Puram, New Delhi
Class : Class 10

Ans 6:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 9

Ans 7:

arin chaitanya from the shri ram school, New Delhi
Class : Class 8

Ans 8:

Agustya vaid from Somerville school vasundhara enclave, Delhi
Class : Class 7
understood?

Ans 9:

Agustya vaid from Somerville school vasundhara enclave, Delhi
Class : Class 7

Ans 10:

Dushyant Singh from Shree Ram Centenial School, Indore
Class : Class 9
sof has given c which is wrong

Ans 11:

Ishaan Roy from Sri Chaitanya Techno School, Bengaluru
Class : Class 10

Ans 12:

Ananya from GIIS, Bangalore
Class : Class 6
why cant the answer be A?

Ans 13:

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

Ans 14:

Aadhira from velammal new gen school, Medavakkam, Chennai
Class : Class 6
The correct answer is (D) because the the magnetic field travels from north to south.

Ans 15:

Punya Paras Sundrani from Anand Niketan , Ahmedabad
Class : Class 7

Ans 16:

Ishaan Roy from Sri Chaitanya Techno School, Bengaluru
Class : Class 10

Ans 17:

Rahil from Delhi Public School Faridabad, Faridabad
Class : Class 7

Ans 18:

Raghav Aggarwal from CAMBRIDGE SCHOOL INDIRAPURAM, INDIRAPURAM
Class : Class 7

Ans 19:

Amrit Jolly from The Shri Ram School Aravali, Gurgaon
Class : Class 6

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Akshay Kumar from BVM, Chennai
Subject :NSO    Class : Class 7

Ans 1:

N Sankar Narahari from Madhavakripa English Nursery and Higher Primary School, Manipal
Class : Class 7
here option c holds true because in option a and b we can make an exception with pulmonary artery and vein.

Ans 2:

Arnav Ranka from Gyan Bharati School, Saket, New Delhi
Class : Class 9
Yes, the answer is option "C". It is not true that arteries will always carry oxygenated blood and the veins will always carry deoxygenated blood (pulmonary vein and artery).

Ans 3:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7

Ans 4:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 7

Ans 5:

Arnav Ranka from Gyan Bharati School, Saket, New Delhi
Class : Class 9

Ans 6:

Aditya Sai Vemparala from Amanora school, Pune
Class : Class 10
C

Ans 7:

Mayank Gupta from Kulachi Hansraj Model School, New Delhi
Class : Class 8

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chandra Deb from ,
Subject :NSO    Class : Class 5

Ans 1:

Bhavya Agrawal from Cambridge Court High School , JAIPUR
Class : Class 8
you are correct Pragun goel . my answer is also a.

Ans 2:

Shriya Sreekrishna from BLUEBELLS SCHOOL INTERNATIONAL, New Delhi
Class : Class 7

Ans 3:

Manasvi Nagpal from blooming dales international school, sri ganganagar
Class : Class 5
a and c both are correct answers

Ans 4:

Pragun goel from Venkateshwar International School, Delhi
Class : Class 8
sea snakes also breathe through skin so option 1 should also be correct.

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Shuvangi Das from Vivekananda mission school, haldia
Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

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

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Rio Choudhury from South Point High School, Kolkata
Subject :NSO    Class : Class 7

Ans 1:

Rithvik from BVM Global, Chennai
Class : Class 9
ummm........... its very tough to identify them....

Ans 2:

Riddhik Bose from Vibgyor High, Airoli, Mumbai
Class : Class 4

Ans 3: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
Molars and Premolars are mainly used to chew the food.

Ans 4:

Pari Shiddam from PIS Powai, MUMBAI
Class : Class 8
D can also be the ans

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vaibhav from , Faridabad
Subject :NSO    Class : Class 7

Ans 1:

Anand Agarwal from stems, kuchinda
Class : Class 7

Ans 2:

Arush from Anandi Public School, Udgir
Class : Class 3
such questions r always confusing.................

Ans 3:

aryan vir from lotusvalley international school gurugram, Gurgaon
Class : Class 7

Ans 4:

aryan vir from lotusvalley international school gurugram, Gurgaon
Class : Class 7

Ans 5:

shweta garg from Apeejay School, Ghaziabad
Class : Class 7

Ans 6:

aryan vir from lotusvalley international school gurugram, Gurgaon
Class : Class 7

Ans 7:

Aryan Keswani from Delhi Public School, Mathura Road, New Delhi
Class : Class 10

Ans 8:

Areyouseriousrn from SBOA Global, Chennai
Class : Class 9
Is D. ✔

Ans 9:

Soumyajit Roy from Delhi Public School Jamnagar, Jamnagar
Class : Class 9

Ans 10:

Aksh Swarnkar from National Center for Excellence CVR, Bangalore
Class : Class 8

Ans 11:

Tanushree from Asian International School, Colombo
Class : Class 7
Can someone pls send the explanation of why it's D🙏

Ans 12:

Areyouseriousrn from SBOA Global, Chennai
Class : Class 9
The solution: Enzyme X works best and increases the rate of reaction at an acidic pH (less than 7) of about two2️⃣ ! Enzyme Y is very very very very very very very very very very very very very very very very very efficient @ slightly acidic pH i.e., slightly less than seven!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Enzyme Z is most efficient at an alkaline pH (more than 7!!!). And alkali means a base which is soluble in water. In humans, gastric juice of stomach (a J-shaped bag with thick inner walls. Meh.) has pH in the range of 1.5-2.5, where enzymes such as pepsin, rennin etc. carry out the digestion of food. Thus, enzyme X can be found in stomach. Similarly, the saliva in the mouth of humans has sliiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiightly acidic pH of 6.8, where salivary amylase enzyme is moooooooooooooooooooooooooooooooooooooooost effective! Thus, enzyme Y can be found in the buccal cavity. Small intestine has slightly alkaline pH of 7.8, where enzymes such as trypsin help in digestion of food. So, enzyme Z can be found in duodenum. Morus Alba is the scientific name of mulberry.

Ans 13:

Arush from Anandi Public School, Udgir
Class : Class 3

Ans 14:

Maanasa from Billabong high, Chennai
Class : Class 7

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ABHAY AGARWAL from ,
Subject :NSO    Class : Class 4

Ans 1:

ABHAY AGARWAL from ,
Class : Class 3

Ans 2:

ANURADHA NAIR from SANDEEPANI VIDYA NIKETHAN SCHOOL, Thrissur
Class : Class 9
B IS THE ANSWER ANURADHA NAIR 4C

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