National Science Olympiad Forum By SOF Olympiad Trainer - Page 651

User Forum

Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
By the help of Photon.

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

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

Ans 2:

Class : Class 7
Answer is c

Ans 3:

Class : Class 6
B is the correct answer

Ans 4:

Class : Class 7
answer is b

Ans 5:

Class : Class 7
The correct answer is b

Ans 6:

Class : Class 8
the correct answer is B

Post Your Answer

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.


??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

Ans 1:

Class : Class 5

Ans 2:

Class : Class 4

Ans 3:

Class : Class 7

Ans 4:

Class : Class 6

Ans 5:

Class : Class 7
B

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 3

Ans 2:

Class : Class 5
why stomata?

Ans 3: (Master Answer)

Class : Class 1
The correct answer is D.

Ans 4:

Class : Class 4
ans :d

Ans 5:

Class : Class 4

Ans 6:

Class : Class 7
d

Ans 7:

Class : Class 3
the correct answer is d

Ans 8:

Class : Class 5
The correct answer is option D.

Ans 9:

Class : Class 5

Ans 10:

Class : Class 4
Ans is D

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

Class : Class 10

Ans 2:

Class : Class 10

Ans 3:

Class : Class 10

Ans 4:

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

Ans 5:

Class : Class 8

Ans 6:

Class : Class 6

Ans 7:

Class : Class 7

Ans 8:

Class : Class 7

Ans 9:

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

Ans 10:

Class : Class 8

Ans 11:

Class : Class 7

Ans 12:

Class : Class 9
sof has given c which is wrong

Ans 13:

Class : Class 7

Ans 14:

Class : Class 9

Ans 15:

Class : Class 8

Ans 16:

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

Ans 17:

Class : Class 7

Ans 18:

Class : Class 7
understood?

Ans 19:

Class : Class 6
why cant the answer be A?

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8

Ans 2:

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 3:

Class : Class 10
C

Ans 4:

Class : Class 9

Ans 5:

Class : Class 7

Ans 6:

Class : Class 7

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).

Post Your Answer

Subject :NSO    Class : Class 5

Ans 1:

Class : Class 7

Ans 2:

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

Ans 3:

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

Ans 4:

Class : Class 5
a and c both are correct answers

Post Your Answer

Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

Class : Class 1
The correct answer is C.

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 4

Ans 2: (Master Answer)

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

Ans 3:

Class : Class 9
ummm........... its very tough to identify them....

Ans 4:

Class : Class 8
D can also be the ans

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 3

Ans 2:

Class : Class 7

Ans 3:

Class : Class 7

Ans 4:

Class : Class 9
Is D. ✔

Ans 5:

Class : Class 7

Ans 6:

Class : Class 9

Ans 7:

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

Ans 8:

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

Ans 9:

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 10:

Class : Class 7

Ans 11:

Class : Class 7

Ans 12:

Class : Class 10

Ans 13:

Class : Class 8

Ans 14:

Class : Class 7

Post Your Answer