National Science Olympiad Forum By SOF Olympiad Trainer - Page 618

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
D I guess,I am not sure

Ans 2:

Class : Class 6
how can a plant release carbondioxide???

Ans 3:

Class : Class 5
Option D

Ans 4:

Class : Class 4

Ans 5:

Class : Class 9

Ans 6:

Class : Class 4
plants can release carbon dioxide at night only tulsi plant does not release carbon dioxide

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 9
it is c because the silk has already started getting produces when it is larva

Ans 2:

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 3:

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 4:

Class : Class 7
it must be c . at cocoon stage silk is already produced

Ans 5:

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 6:

Class : Class 7
OPTION C

Ans 7:

Class : Class 7
admin please answer

Ans 8:

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 9:

Class : Class 8
no it is c

Ans 10:

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 11:

Class : Class 9
also felt d but explanation provided above makes me feel c

Ans 12:

Class : Class 9

Ans 13:

Class : Class 9
Ans C

Ans 14:

Class : Class 8
as larva produces and when it is fully produced it forms a cocoon

Ans 15:

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 16:

Class : Class 7
I thought the silk is obtained from the cocoon

Ans 17:

Class : Class 8
I THINK THE ANSWER IS C

Ans 18:

Class : Class 7

Ans 19:

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 20:

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 21:

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

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
C

Ans 2:

Class : Class 7
how dumb am i thought c wrote d

Ans 3:

Class : Class 6
@Aditya Kumble Same

Ans 4:

Class : Class 8
c

Ans 5:

Class : Class 7
CEZY PZY LEMONS SQUEEZY PIZA CHEEZY

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8

Ans 2:

Class : Class 9
The correct answer is B.

Ans 3: (Master Answer)

Class : Class 1
The correct answer is B.

Ans 4:

Class : Class 9

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 4

Ans 2:

Class : Class 4

Ans 3:

Class : Class 8

Ans 4:

Class : Class 9
B

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4

Ans 2:

Class : Class 4
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Ans 3:

Class : Class 5
Answer will be A). It is because, humus is found on topsoil and not in deep layers of soil.

Ans 4:

Class : Class 8
I don't know

Ans 5:

Class : Class 5

Ans 6:

Class : Class 4
c correct

Ans 7:

Class : Class 4

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 5
hi

Ans 2:

Class : Class 8

Ans 3:

Class : Class 8

Ans 4:

Class : Class 9
Hi friend. The ans is b. It is the hottest planet because of large amount of CO2 in it which causes greenhouse effect. It is true that it reflects sunlight but this is not the reason for it being hot. HOPE THIS HELPS YOU!!!

Ans 5:

Class : Class 9

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 9
confusing

Ans 2:

Class : Class 8
As per solution, 243 days is longer than a year.

Ans 3:

Class : Class 9
the answer is not correct

Ans 4:

Class : Class 8
Hii, This means that you gotta name the planet which takes more than one Earth year i.e. more than 365 days to complete one rotation on its axis...Answer is Jupiter

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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 9

Ans 2:

Class : Class 8
the figure given is wrong.. the second figure says - granules of y... it should have been 'granules of x''

Ans 3:

Class : Class 9

Ans 4: (Master Answer)

Class : Class 1
The correct answer is D.

Ans 5:

Class : Class 10
It says in the second test tube that there is a colourless solution of Y SO4and granules of Y! It should be colourless solution of X SO4 and granules of Y.

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
P,R,T. By closing these switches and none of the other open ones, one wire is connected to the filament no 1 of the bulb but 2 to the doorbell. This gives only sound energy.

Ans 2:

Class : Class 6
B

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