National Science Olympiad Forum By SOF Olympiad Trainer

student from school, city

Subject :NSO Class : Class 6

Ridhan classified animals in four groups on the basis of their feeding habits. In doing so, he wrongly placed one animal in one of the groups. Identify this group and select the correct option.

A Giraffe, rabbit, wildebeest and deer
B Crocodile, crow, snake and eagle
C Leech, mosquito, lice and bed bug
D Tiger, snow leopard, wolf and lion

CROW IS AN OMNIVORE NOT A CARNIVORE AS MENTIONED IN THE SOLUTION

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Ans 1:

sujata patel from Podar International, Pune

Class : Class 6

i have been recently taught about this in school. eagle is a carnivore

Ans 2:

Ashi Goyal from Sacred heart convent school,raikot road,barnala, punjab

Class : Class 6

Ans 3:

Subhang Deep Sahu from Narayana CO Kadugodi Bangalore, Bangalore

Class : Class 8

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Aaryan from New horizons public school , Mumbai

Subject :NSO Class : Class 8

The given figure shows a typical animal cell with its parts being labelled as 'a - j'. Identify the labelled parts and select the incorrect option regarding it.

A The organelles e, h, g and i are membrane-bound organelles which function in close coordination with one another.
B 'f' organelle is responsible for the synthesis of fats inside the cells and it stores Ca²⁺ for release during muscle contraction.
C a and b have selective permeability i.e., they allow only selected substances to pass inwardly.
D 'j' is the site for protein synthesis. It allows hereditary message from 'd' to get translated into proteins.

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Ans 1:

Praganya from GPS, Bengaluru

Class : Class 8

Ans 2:

Anshuman D from MVM, Hyderabad

Class : Class 9

But ribosomes don't have membrane

Ans 3:

Anshuman D from MVM, Hyderabad

Class : Class 9

But ribosomes don't have membrane

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Soham from DPS Whitefield, Bangalore

Subject :NSO Class : Class 5

The given set-up shows the separation process of a mixture of water and materials X and Y. X and Y respectively could be_______.

AMud and salt
BSalt and sugar
CSugar and salt
DMud and clay

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Ans 1:

Sarayu Pasupunuri from Gitanjali primary school, Hyderabad

Class : Class 5

didnt understand

Ans 2:

Arnav from Kkps, Nanded

Class : Class 5

did not label properly

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Mayank Sandh from Delhi Public School Bhilai, Bhilai

Subject :NSO Class : Class 9

Refer to the given flow chart and select the incorrect statement regarding W, X, Y and Z.

A W could be abundant in RBCs whereas X could be absent in xylem parenchyma.
B Y provides energy during starvation whereas Z provides surface for synthesis of steroid hormones.
C W helps in synthesis of proteins whereas Y secretes enzymes which are used for breaking limiting membrane of eggs.
D X could provide intermediates for the synthesis of certain steroids and cytochromes whereas Z stores calcium for release during muscle contraction.

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Arkodyuti Maiti from KDAV, Jamnagar

Subject :NSO Class : Class 7

The hairy skin of the sheep has two types of fibres that form its fleece: (i) the coarse beard hair and (ii) the fine soft under hair close to the skin. Which of the hair provide the fibres for making wool?

A(i)
B(ii)
C(i) and (ii)
DNone of these

But for making what is not mentioned like for making sweater or carpet

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Ans 1:

Sara Kashyap from Vista International, HYDERABAD

Class : Class 7

yes..... even i think the question isnt framed properly.... we use both types of wool for different things as Priyanshu said

Ans 2:

SANVI from D PS VADODARA, Vadodara

Class : Class 9

when I opened the question paper ,questions from 29 to 31 were not visible

Ans 3:

Sargah Surya from bgsnps, Bengaluru

Class : Class 4

both types of hair are used based on their function. They must specify for what. This question is not proper

Ans 4:

PRIYANSHU DEB from New Green Field School, Saket, New Delhi

Class : Class 7

yes both i and ii since undercoat is for socks, high quality...etc. but outer is for coarse carpets...etc

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S Nithyanth from Geethanjali Vidyalaya, Bangalore

Subject :NSO Class : Class 4

Select the option which would most closely resembles the mirror image of the given Fig. (X), if the mirror is placed along MR.

A
B
C
D

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Ans 1:

S Nithyanth from Geethanjali Vidyalaya, Bangalore

Class : Class 6

Ans 2:

Apoorva Gaurav from DAV, Muzaffarpur

Class : Class 5

Option c is correct.

Ans 3:

UMANG from SPRING DALE COLLAGE, Lucknow

Class : Class 8

Option C is correct

Ans 4:

UMANG from SPRING DALE COLLAGE, Lucknow

Class : Class 8

Option C is correct

Ans 5:

S Nithyanth from Geethanjali Vidyalaya, Bangalore

Class : Class 6

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Gauri Singh from St Johns School Marhauli, Varanasi

Subject :NSO Class : Class 6

Which of the following groups of organisms live in marine habitats?

A Whales, Crocodile, Sea turtle
B Whales, Jelly fish, Sea weed
C Fish, Frog, Tortoise
D Crab, Oyster, Duckweed

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Ans 1:

Nirbhay from Podar International School, mysore

Class : Class 6

this was sent in 2025

Ans 2:

Nirbhay from Podar International School, mysore

Class : Class 6

class:

Ans 3:

SHREYAS ANANDHAN from Phoenix Greens International School, Hyderabad

Class : Class 6

Ans 4:

Krishiv Gupta from Sat Paul Mittal School, Ludhiana

Class : Class 6

Why is everyone writing there class

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Bitan Chakraborty from Adamas international school, Kolkata

Subject :NSO Class : Class 4

former capital of Pakistan

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Ans 1:

Bitan Chakraborty from Adamas international school, Kolkata

Class : Class 10

Karachi

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Agastya Tripathi from dps gurgaon, Gurgaon

Subject :NSO Class : Class 5

Two substances, P and Q, were used to fill a syringe. The plunger was then pushed in as shown in the diagram.

Which of the following would most likely be P and Q?

A
B
C
D