National Science Olympiad Forum By SOF Olympiad Trainer

Shriya Sreekrishna from BLUEBELLS SCHOOL INTERNATIONAL, New Delhi

Subject :NSO Class : Class 6

Select the option that correctly fills up the blanks in any two of the given statements.
P. In plants with tap root, the leaves have mostly __(i)__ venation and in plants with fibrous roots, the leaves have mostly __(ii)__ venation.
Q. Some plants have small openings called __(i)__ on the lower surface of the leaves, which help in __(ii)__.
R. Leaves are modified into __(i)__ that help the plant to attach itself to a support, while __(ii)__ are modified leaves, that reduce the amount of water lost from the plant.

AP (i) parallel, (ii) reticulate; Q (i) stomata, (ii) gaseous exchange
BQ (i) stomata, (ii) water absorption; R (i) tendrils, (ii) spines
CP (i) reticulate, (ii) parallel; Q (i) stomata, (ii) gaseous exchange
DP (i) parallel, (ii) reticulate; R (i) tendrils, (ii) spines

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Ans 1:

Sanaullah Siddiqui from Samithi English Medium School, Surat

Class : Class 8

TINK ITS C

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

Study the following table and select the correct option regarding P, Q, R and S.

AOrganism P can also respire through its buccopharyngeal cavity.
BOrganism Q could be a frog or an earthworm.
COrganism R can be Hydrilla or Vallisneria.
DRespiratory structure S is also found in scoliodon and whale.

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

Preeti burnt a fibre X. She found that X is selfextinguishing and leaves a dull black bead which crushes easily to powder. Which of the following could be fibre X?

AWool
BSilk
CNylon
DBoth A and B

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Ans 1:

Aadya from Gma, Dubai

Class : Class 7

Ans 2:

sankalp from Gyan Bharti School, Saket, Delhi

Class : Class 10

Ans 3:

Aadya from Gma, Dubai

Class : Class 7

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Adhyan Jain from Narayana Group of Schools, mumbai

Subject :NSO Class : Class 6

Refer to the given food chain.

With respect to it which of the following graphs correctly shows the relationship of caterpillar and bird populations if X is introduced in the given food chain which exclusively feeds on bird?

A
B
C
D

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Ans 1:

Prithu Ashish from Vibgyor High Bannerghatta, Bangalore

Class : Class 6

D) is the ans.

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VIVAAN GARG from KR MANGALAM WORLD SCHOOL, FARIDABAD

Subject :NSO Class : Class 3

Siddhi took some plasticine and shaped it into object X. She reshaped the same piece of plasticine into object Y. We can conclude that both objects have the same _________.

A P and Q only
B P and R only
C Q and R only
D P, Q and R

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Ans 1:

from , Ahmedabad

Class : Class 4

Ans c

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

Mercury melts at -39°C and boils at 357°C. Alcohol melts at -115°C and boils at 78°C. At which temperature are both substances in liquid state?

A-49°C
B-15°C
C100°C
D360°C

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

Read the given statements and select the correct option.
Statement 1 : Concave mirrors are used in torches and car headlights.
Statement 2 : Concave mirrors converge the light of the bulbs of torches and car headlights to form a beam of light.

ABoth statement 1 and statement 2 are true and statement 2 is the correct explanation of statement 1.
BBoth statement 1 and statement 2 are true but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true but statement 2 is false.
DStatement 1 is false but statement 2 is true.

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Ans 1:

Sargah Surya from bgsnps, Bengaluru

Class : Class 4

Ans 2:

from dps north kolkata, Kolkata

Class : Class 8

i dont agree

Ans 3:

Joshua Sen from Montfort Senior Secondary School, Roorkee

Class : Class 10

concave mirrors converge light

Ans 4:

AISHA from K.V.No.-1,A.F.S.,SEC.-14, GURUGRAM

Class : Class 10

C

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Gaurang Garg from Delhi Piblic School, Bulandshahr

Subject :NSO Class : Class 8

Feeling the tremors of an earthquake, a scared resident of thirteenth floor of a multistoreyed building starts climbing down the stairs rapidly. Which hormone initiated this action?

A Oxytocin
B Thyroxine
C Adrenaline
D Progesterone

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Archi from Mothers Global School, Delhi

Subject :NSO Class : Class 8

When air is passed through red hot coke, a gaseous fuel is produced. The name of this gaseous fuel and its composition are respectively

A Natural gas, CO + H₂
B Producer gas, N₂ + CO
C Water gas, H₂ + CO
D None of these.

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Ans 1:

PARTH JAIN from DPS INDIRAPURAM, GHAZIABAD

Class : Class 8

Ans 2:

Nishan Asif from INDIAN SCHOOL SOHAR OMAN, SUHAR

Class : Class 9

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

Which of the following is not a structural adaptation?

A Forelimbs of penguin are modified into flippers for swimming.
B Fennec fox has large ears to help it lose excessive body heat which enables it to inhabit hot xeric habitats.
C Palatable viceroy butterfly mimics unpalatable monarch butterfly to elude its predators.
D Cane toad and hedgehog aestivate to escape harsh summers.

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Sargah Surya from bgsnps, Bengaluru

Class : Class 4

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