National Science Olympiad Forum By SOF Olympiad Trainer - Page 61

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 4
Jupiter also have rings. so option B andD can be correct here

Ans 2:

Class : Class 4

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Subject :NSO    Class : Class 7

Refer to the given dichotomous key and identify P, Q, R, S and T.
I. (A) Propagates vegetatively by natural methods. - Go to II
(B) Propagates vegetatively by artificial methods. - Go to IV
II. (A) New plant develops from stem of parent plant. - Go to III
(B) Roots of parent plant gives rise to new plant. - P
III. (A) Short underground stem covered with fleshy scale leaves. - Q
(B) Modified underground stems (bearing buds) which store food and become swollen. - R
IV. (A) Roots develop from young branch bent towards the ground and covered with soil. - S
(B) It involves placing of stem cutting of one plant over cut stem (having extensive roots) of other plant and tying them. - T

AP could be potato whereas R could be garlic.
BT could be coriander whereas S could be spinach.
CP could be beetroot whereas Q could be turnip.
DQ could be onion whereas S could be strawberry.


'D' is the answer because I am very intelligent.

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Subject :NSO    Class : Class 7

Refer to the given Venn diagram and select the correct option regarding P and Q.


AAngora, Mohair and cashmere are few varieties of P obtained from different mammals.
BP and Q when burnt give the smell of burning hair and charred meat respectively.
CFabric made of P can be used in winter clothing whereas fabric made of Q is waterproof hence can be used for making umbrellas or raincoats.
DReeling is involved in processing of P whereas fibre Q is obtained by retting.


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Subject :NSO    Class : Class 7

Read the given paragraph and select the option that correctly fills the blanks in it. The female silk (i) lays egg which hatches into a tiny caterpillar. It feeds on (ii) and grows. When it is ready to enter the next stage in its life cycle, it first weaves a net to hold itself by secreting a proteinaceous fibre which (iii) on exposure to air. This is the silk fibre. The silkworm covers itself completely with this fibre to form a (iv) . At this stage, the larva is called a (v).
(i)-----(ii)-----(iii)-----(iv)-----(v)

AMoth---Seeds---Hardens---Pupa---Cocoon
BLarva---Leaves---Softens---Pupa---Cocoon
CLarva---Leaves---Softens---Pupa---Cocoon
DMoth---Stem---Softens---Cocoon---Pupa


it will be d.

Ans 1:

Class : Class 8

Ans 2:

Class : Class 7
the answer is same for b

Ans 3:

Class : Class 7
The female silk moth (i) lays eggs which hatch into a tiny caterpillar. It feeds on mulberry leaves (ii) and grows. When it is ready to enter the next stage in its life cycle, it first weaves a net to hold itself by secreting a proteinaceous fibre which hardens (iii) on exposure to air. This is the silk fibre. The silkworm covers itself completely with this fibre to form a cocoon (iv). At this stage, the larva is called a pupa (v)

Ans 4:

Class : Class 7
But silk moth is not larva it is moth

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