National Science Olympiad Forum By SOF Olympiad Trainer

User Forum

Subject :NSO    Class : Class 7

Ans 1: (Master Answer)

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

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7

Ans 2:

Class : Class 7

Ans 3:

Class : Class 7
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 4:

Class : Class 7

Ans 5:

Class : Class 7

Ans 6:

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

Ans 7:

Class : Class 7
Is D. ✔

Ans 8:

Class : Class 7

Ans 9:

Class : Class 7

Ans 10:

Class : Class 3

Ans 11:

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

Post Your Answer

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 5
B IS THE ANSWER ANURADHA NAIR 4C

Ans 2:

Class : Class 3

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5
The answer is B as when we use electricity fuel gets burnt and so it produces carbon dioxide.

Ans 2:

Class : Class 4
THE OPTION SHOULD HAVE BEEN CFC OR WE CAN TAKE THE OPTION D [NITROGEN] BUT IT IS SHOWING WRONG

Ans 3:

Class : Class 4
I think the answer should be CFC but it is not in the options only.But I also think that it is CO2.

Ans 4:

Class : Class 5
The answer was supposed to be CFC .

Ans 5:

Class : Class 1
It should be CFCS

Ans 6:

Class : Class 6
The correct answer should be CFC

Ans 7:

Class : Class 3

Ans 8:

Class : Class 5
Actually it is b ,as a is CNG(compressed natural gas which is a energy source that is not a greenhouse gas

Ans 9:

Class : Class 3
the correct answer is CFCs .but is not mention in the option.

Ans 10:

Class : Class 4
the ans should be CFC

Ans 11:

Class : Class 5
I GOT IT CORRECT

Ans 12:

Class : Class 5

Ans 13:

Class : Class 4
how the released gas from refrigerator is CO2

Ans 14:

Class : Class 5

Ans 15:

Class : Class 4
Chloro-fluro-carbon

Ans 16:

Class : Class 4
CFCS should be correct answer but I got it right

Post Your Answer

Subject :NSO    Class : Class 6

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Class : Class 1
The correct answer is B.

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Class : Class 1
The correct answer is D.

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
the answer is d

Ans 2:

Class : Class 4

Ans 3:

Class : Class 6
answer is clearly a

Ans 4:

Class : Class 5
ans is D

Ans 5:

Class : Class 7
master answwer really

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
The correct answer is B as the bulb Y is in straight series and there is no change of current passing through it. And the curent gets equally divided among X and Y.

Ans 2:

Class : Class 6

Ans 3:

Class : Class 6
b is answer

Ans 4:

Class : Class 9
correct answer should be option B because there is no change in the current passing through lamp Y.

Ans 5:

Class : Class 6

Ans 6:

Class : Class 7
It should be B as no change of current is there in Y.

Ans 7:

Class : Class 6

Ans 8:

Class : Class 6

Ans 9:

Class : Class 7
i agree with him too

Ans 10:

Class : Class 9

Ans 11:

Class : Class 8
I agree with Abhaid Goel.

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 9
The scientific name of WBC is leukocyte. There are 5 types of leukocytes namely: Basophils , Eosinophil, Neutrophil, Lymphocyte. The scientific name of red blood cells is erythrocytes. Maybe there is no scientific name for platelets or it may appear that I don't know it.

Post Your Answer