National Science Olympiad Forum By SOF Olympiad Trainer - Page 620

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Subject :NSO    Class : Class 6

Aarushi took two food samples X and Y in separate test tubes. She added 2-3 drops of Benedict’s solution in food sample X and heated it while she added two drops of copper sulphate solution and few drops of caustic soda solution in food sample Y. She observed that sample X turned brick-red while sample Y turned purple.
Which of the following is correct regarding X and Y?

A X consists of protein while Y consists of starch.
B X consists of sugar while Y consists of protein.
C X consists of starch while Y consists of protein.
D X consists of sugar while Y consists of starch.


Ans 1:

Class : Class 7
answer is b

Ans 2:

Class : Class 8
the correct answer is B

Ans 3:

Class : Class 6
B is the correct answer

Ans 4:

Class : Class 10
The answer is actually C because starch consists of carbohydrates and sugars, but sugars is not the exact answer.

Ans 5:

Class : Class 7
Answer is c

Ans 6:

Class : Class 7
The correct answer is b

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Subject :NSO    Class : Class 4

Rohit performed an experiment wherein he set up three test tubes as shown in the figure. Select the INCORRECT statement regarding this.


ATest tube P will have most carbon dioxide after three hours.
BTest tube Q will have least oxygen after three hours.
COrganisms in test tube R will survive for a longer time as compared to organisms in test tubes P and Q.
DNo oxygen will remain in test tube P after some time.


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Ans 1:

Class : Class 6

Ans 2:

Class : Class 8

Ans 3:

Class : Class 4

Ans 4:

Class : Class 7

Ans 5:

Class : Class 7
B

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5
The correct answer is option D.

Ans 2:

Class : Class 5
why stomata?

Ans 3:

Class : Class 4
Ans is D

Ans 4:

Class : Class 7
d

Ans 5:

Class : Class 3
the correct answer is d

Ans 6:

Class : Class 3

Ans 7:

Class : Class 5

Ans 8: (Master Answer)

Class : Class 1
The correct answer is D.

Ans 9:

Class : Class 4

Ans 10:

Class : Class 4
ans :d

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
why cant the answer be A?

Ans 2:

Class : Class 7

Ans 3:

Class : Class 10

Ans 4:

Class : Class 9
the field line travels from north to south

Ans 5:

Class : Class 8

Ans 6:

Class : Class 7

Ans 7:

Class : Class 8

Ans 8:

Class : Class 9
sof has given c which is wrong

Ans 9:

Class : Class 6
The correct answer is (D) because the the magnetic field travels from north to south.

Ans 10:

Class : Class 7

Ans 11:

Class : Class 8

Ans 12:

Class : Class 9

Ans 13:

Class : Class 7
understood?

Ans 14:

Class : Class 7
the answer is d because the field lines of a magnet always travle from north to south

Ans 15:

Class : Class 7

Ans 16:

Class : Class 10

Ans 17:

Class : Class 10

Ans 18:

Class : Class 6

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8

Ans 2:

Class : Class 6

Ans 3:

Class : Class 10
C

Ans 4:

Class : Class 9

Ans 5:

Class : Class 6

Ans 6:

Class : Class 7
here option c holds true because in option a and b we can make an exception with pulmonary artery and vein.

Ans 7:

Class : Class 9
Yes, the answer is option "C". It is not true that arteries will always carry oxygenated blood and the veins will always carry deoxygenated blood (pulmonary vein and artery).

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 8
you are correct Pragun goel . my answer is also a.

Ans 2:

Class : Class 7

Ans 3:

Class : Class 5
a and c both are correct answers

Ans 4:

Class : Class 8
sea snakes also breathe through skin so option 1 should also be correct.

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Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

Class : Class 1
The correct answer is C.

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Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

Class : Class 1
Molars and Premolars are mainly used to chew the food.

Ans 2:

Class : Class 8
ummm........... its very tough to identify them....

Ans 3:

Class : Class 4

Ans 4:

Class : Class 8
D can also be the ans

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 9
The solution: Enzyme X works best and increases the rate of reaction at an acidic pH (less than 7) of about two2️⃣ ! Enzyme Y is very very very very very very very very very very very very very very very very very efficient @ slightly acidic pH i.e., slightly less than seven!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Enzyme Z is most efficient at an alkaline pH (more than 7!!!). And alkali means a base which is soluble in water. In humans, gastric juice of stomach (a J-shaped bag with thick inner walls. Meh.) has pH in the range of 1.5-2.5, where enzymes such as pepsin, rennin etc. carry out the digestion of food. Thus, enzyme X can be found in stomach. Similarly, the saliva in the mouth of humans has sliiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiightly acidic pH of 6.8, where salivary amylase enzyme is moooooooooooooooooooooooooooooooooooooooost effective! Thus, enzyme Y can be found in the buccal cavity. Small intestine has slightly alkaline pH of 7.8, where enzymes such as trypsin help in digestion of food. So, enzyme Z can be found in duodenum. Morus Alba is the scientific name of mulberry.

Ans 2:

Class : Class 3
such questions r always confusing.................

Ans 3:

Class : Class 10

Ans 4:

Class : Class 7

Ans 5:

Class : Class 7

Ans 6:

Class : Class 9
Is D. ✔

Ans 7:

Class : Class 7

Ans 8:

Class : Class 9

Ans 9:

Class : Class 7
Can someone pls send the explanation of why it's D🙏

Ans 10:

Class : Class 7

Ans 11:

Class : Class 3

Ans 12:

Class : Class 7

Ans 13:

Class : Class 7

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Subject :NSO    Class : Class 4

Refer to the given paragraph and table and answer the following questions.
Neha took 100 gm each of three types of soil, X, Y and Z, in three separate pots with hole at the bottom. The amount of water that was poured in the soil pot, just before it started dripping from the bottom hole, is tabulated here.

The soil that is mixture of clay, sand, humus and is usually very good for growth of most plants is __________.

A X
B Y
C Z
D Cannot be determined


Ans shd be D (Cannot be determined)

Ans 1:

Class : Class 3

Ans 2:

Class : Class 9
B IS THE ANSWER ANURADHA NAIR 4C

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