Subject :NSO Class : Class 7
Which of the following stages in the life history of a silk moth produces silk fibres?
A 
B 
C 
D 
the answer to this question is c r d please tellme
Ans 1:
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 2:
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 3:
Class : Class 7
admin please answer
Ans 4:
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
Ans 5:
Class : Class 8
I THINK THE ANSWER IS C
Ans 6:
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 7:
Class : Class 9
Ans C
Ans 8:
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 9:
Class : Class 8
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 10:
Class : Class 9
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 7
I thought the silk is obtained from the cocoon
Ans 12:
Class : Class 9
also felt d but explanation provided above makes me feel c
Ans 13:
Class : Class 7
OPTION C
Ans 14:
Class : Class 8
as larva produces and when it is fully produced it forms a cocoon
Ans 15:
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 16:
Class : Class 8
no it is c
Ans 17:
Class : Class 9
it is c because the silk has already started getting produces when it is larva
Ans 18:
Class : Class 7
it must be c . at cocoon stage silk is already produced
Ans 19:
Class : Class 7
Ans 20:
Class : Class 9
Ans 21:
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