National Science Olympiad Forum By SOF Olympiad Trainer

Thamognya from nps, Singapore

Subject :NSO Class : Class 5

The given 24-hour clocks show sleeping time of cow, python, giraffe and cat.

Cow, python, giraffe and cat sleep for how many hours a day respectively?

(A) 2, 9, 1, 6

(B) 1, 6, 3, 4

(C) 4, 18, 2, 12

(D) 2, 17, 1, 7

ertyui

Ans 1:

Gauri Singh from St. John's School, Marhauli, Varanasi

Class : Class 10

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Manojna from Oakridge International School, Hyderabad

Subject :NSO Class : Class 5

What is the process when the water goes up ? A)condensation B)evaporation C)boiling D)freezing

Ans 1:

Manojna from Oakridge International School, Hyderabad

Class : Class 5

B)condensation Is the correct answer

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Devansh123 from D.S.B INTERNATIONAL PUBLIC SCHOOL, Rishikesh

Subject :NSO Class : Class 8

Which of the following is an incorrect match?

(A) Alexander Fleming - Penicillin

(B) Louis Pasteur - Fermentation

(C) Edward Jenner - Vaccination

(D) Anton von Leeuwenhoek - Sterilization.
i think it should be b because louis pasteur invented pasteruization

Ans 1:

Nandini Singh from Delhi Public School, Anuppur

Class : Class 9

No, because Louis Pasteur explained the process of fermentation

Ans 2:

Amir Raza from wood bine modern school, Darbhanga

Class : Class 8

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Akshit Ayan from Deens Academy, Bengaluru

Subject :NSO Class : Class 3

Which of these are excretory organs?

(A) (a) & (b)

(B) (b) & (c)

(C) (a) & (c)

(D) (a), (b) & (c)

please explain how (a) is excretory organ.

Ans 1:

Ansh Agarwal from BGS international public school, delhi

Class : Class 7

a..is exceretory because it exhale carbon di oxide.... answer is option A

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Pulkit Khanna from DELHI PUBLIC SCHOOL RUBY PARK KOLKATA, Kolkata

Subject :NSO Class : Class 7

In terrestrial plants, roots normally play a very important role in the absorption of nutrients and water from the soil. However, in aquatic plants, roots are much reduced in size. Some of these plants have narrow and thin ribbon-like leaves. These can bend in the flowing water. In some submerged plants, leaves are often highly divided.
Why are their leaves ribbon-shaped or divided ?
(a) The water can easily pass through these leaves without damaging them.
(b) They do not need to store water.
(c) They keep the plant afloat.
(d) They look pretty.

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Ans 1:

rizwana from heritage international school, daltonganj

Class : Class 10

a

Ans 2:

Ayaan from DPS DLF CITY, Gurgaon

Class : Class 8

The answer is A

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Pulkit Khanna from DELHI PUBLIC SCHOOL RUBY PARK KOLKATA, Kolkata

Subject :NSO Class : Class 7

In terrestrial plants, roots normally play a very important role in the absorption of nutrients and water from the soil. However, in aquatic plants, roots are much reduced in size. Some of these plants have narrow and thin ribbon-like leaves. These can bend in the flowing water. In some submerged plants, leaves are often highly divided.
Why do aquatic plants have a root system which is not very well developed?
(a) So that they can be pulled out easily.
(b) It helps them float.
(c) Since they grow in water they don't need long roots to absorb water.
(d) They do not need to absorb minerals.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is C.

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Pulkit Khanna from DELHI PUBLIC SCHOOL RUBY PARK KOLKATA, Kolkata

Subject :NSO Class : Class 7

In the given flow chart,

Pick the incorrect match.
(i) ----- (ii) ----- (iii) ----- (iv)----- (v)
(a) Chemical ----- Physical ----- Chemical ----- Irreversible ----- Reversible
(b) Physical ----- Physical ----- Chemical ----- Chemical ----- Chemical
(c) Irreversible ----- Chemical ----- Physical ----- Reversible ----- Chemical
(d) Irreversible ----- Chemical ----- Chemical ----- Irreversible ----- Irreversible