National Science Olympiad Forum By SOF Olympiad Trainer - Page 226

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 1
I don’t think that ozone is a greenhouse gas …

Ans 2:

Class : Class 5
Sulphur dioxide is a greenhouse gas.

Ans 3:

Class : Class 5
yeah sulphur dioxide forms acid rain

Ans 4:

Class : Class 6

Ans 5:

Class : Class 4
sulphur dioxide is a greenhouse gas infact it possess 100 year global warming potential than any other greenhouse gas and ozone is not a greenhouse gas so option C should be correct and not D

Ans 6:

Class : Class 5
Ozone and Sulphur dioxide both are green house gas. All the options are greenhouse gas and there is no correct answer in my opinion

Ans 7:

Class : Class 6
Sulphur dioxide does cause acid rain but, is not a greenhouse gas as, it can not / does not trap heat.

Ans 8:

Class : Class 5
ozone traps heat so it is a greenhouse gas

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Subject :NSO    Class : Class 3

A force can be either a push or pull. Which of the following classifications has been described INCORRECTLY?

Action Type of force Effect
A Flicking an insect that is flying towards you Push The force sends the flying insect in the opposite direction.
B Kicking a stationary pebble Push The force causes the pebble to roll away.
C Closing a car door from outside Pull The force moves the door.
D Stretching an elastic wristband Pull The force changes the shape of the wristband.


Ans 1:

Class : Class 5
Option C. is described INCORRECTLY. Because here Type of force is Push not Pull, when the car door is closing from outside.

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 10

Observe the given graph showing changes in endometrium in a female during her menstrual cycle and select the correct statement regarding P, Q, R and S.


ADuring phase P, secretion of FSH and estrogen increases, which develops the uterine lining.
B Phase R involves release of ovum from an ovary, marked by peak levels of LH and progesterone.
C In phase Q, relaxin hormone attains a peak and repairs endometrium of uterus.
D During phase S, progesterone is secreted from ovary and maintains thickness of endometrium.


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Subject :NSO    Class : Class 7

Refer to the given figure illustrating different types of pollination in plants. Rishi planted three different species of plants (X, Y and Z) in his garden whose seeds are dispersed by explosive mechanism. The given figure shows distribution of these plants in Rishi’s garden over a time period. Now, select the correct statement regarding it.


A X undergoes process P only whereas Y and Z undergo processes Q and R only.
B X could be a male plant of species undergoing only process R whereas Y and Z plants could undergo any of the processes P, Q or R depending upon the type of species.
C X is a plant undergoing only process Q so its population does not increase with time in the absence of other plant of the same species in the garden.
D Plants Y and Z are unisexual plants which can undergo only processes P and Q thereby assuring fertilisation and seed setting in absence of other plants of their species.


Ans 1:

Class : Class 7
b

Ans 2:

Class : Class 8
Ans. B is correct

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
Option C..

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
Option C

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Subject :NSO    Class : Class 7

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