National Science Olympiad Forum By SOF Olympiad Trainer

kaithabjeetsingh@gmail.com from the shri ram school aravali, Gurgaon

Subject :NSO Class : Class 7

Which of the following form virtual and erect image for all positions of a self luminous object?

A Convex lens
B Concave lens
C Convex mirror
D Concave mirror

pls explain

Ans 1:

Taksh from St John High School, Mumbai

Class : Class 8

Ans a

Ans 2:

thechampiondaksh from K R Mangalam World School, New Delhi

Class : Class 8

the answer is c according to me as convex mirror always forms diminished , erect and virtual image

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TEJAS SHENDE from kendriya Vidyalaya IIT Mumbai, Mumbai

Subject :NSO Class : Class 7

Which one of the following statements is incorrect?

AThe radicle of the seed grows downwards.
BThe plumule forms the future root of the plant
CAfter fertilisation, the ovule forms pollen grains.
DThe embryo of a seed consists of the testa and radicle.

According to the question, we need to choose the incorrect option. And both option(B) and option(C) are incorrect, as the plumule forms the future shoot, rather than root.

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Ans 1:

Aditya kumar from Sapphire International School, Noida

Class : Class 8

as u are correct that pumule form the shoot of plant but in some cases it is future root like in some plants radicle decay due to some disease so pumule grows as root . So here right option will be "c"

Ans 2:

parijatsomani from The Global Edge School, Hyderabad

Class : Class 7

they are asking what is incorrect

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Chandan NS from DPS NORTH, Bengaluru

Subject :NSO Class : Class 3

Raju's grandfather has weak eyesight and cannot see without spectacles. He has lost his spectacles. Which of these means of communication would help him to get updates?

a. b.

c. d.

Aa and b
Ba and d
Cc and d
DAll of these

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Ans 1:

Praveen Tiwari from St Joseph high school, Maharajganj

Class : Class 9

Maharajganj

Ans 2:

from ,

Class :

Answer is option C. Both Radio and Television can be used to get updates because they support audio.

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Chandan NS from DPS NORTH, Bengaluru

Subject :NSO Class : Class 3

Read the given statements.

a - is a ____1____ .

b - has a ____2____ beak.

Select the option that correctly fills the above blanks.

A1 - Weaver bird, 2 - Long and curved
B1 - Tailor bird, 2 - Long, pointed and straight
C1 - Flamingo, 2 - Strong, sharp and hooked
D1 - Partridge, 2 - Long and flat

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Ans 1:

from ,

Class :

Tailor bird. It makes its nest with the leaves sewn to gether.

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Apurv Yadnopavit from Hutchings high school talegaon pune, Pune

Subject :NSO Class : Class 8

Read the given statements and select the correct option.
Statement 1 : To maintain soil fertility, it is essential to prevent overgrazing and deforestation.
Statement 2 : Roots of plants grasp soil well and prevent removal of top soil by air, water, etc.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true and statement 2 is false.
D Both statements 1 and 2 are false.

Please see to it that you may have typed the word "fertility" instead on the word "erosion". Soil grasping has nothing to do with soil fertility.

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Ans 1:

Shriram dindore from KVS 9BRD AFS PUNE, PUNE

Class : Class 8

Ans 2:

Shriram dindore from KVS 9BRD AFS PUNE, PUNE

Class : Class 8

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gourinandana from delhi public school gbn, Noida

Subject :NSO Class : Class 8

What does the given figure signify?

(A) Life cycle of a plant

(B) Jhum cultivation

(C) Crop rotation

(D) Mixed cropping.

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Ans 1:

Dr Anupa Ghosh from ,

Class : Class 8

The correct answer is crop rotation(C).

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OM KANADE from Euro School, Bengaluru

Subject :NSO Class : Class 8

Cooling always accompanies evaporation because

A air molecules cool the liquid surface
B the more energetic molecules leave the liquid
C there are fewer liquid molecules left in the liquid
D the escaped molecules return to the liquid.

Plz explain how

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Ans 1:

Aakarshak Swaraj from Podar international school , Surat , Surat

Class : Class 7

please explain the answer of this question

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Soham De from DPS, Nerul, Mumbai

Subject :NSO Class : Class 4

Garima is South-east of Latika and South of Prerna. Latika is standing in which of the following correct boxes in the grid?

(A) R

(B) Q

(C) P

(D) S

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Ans 1:

nitin loya from prabhat kids, Akola

Class : Class 4

tricky

Ans 2:

Madhurya Ahuja from The Modern School , NCR

Class : Class 10

Tricky

Ans 3:

KVS Varshith from meridian, kalyan

Class : Class 10

K.V.S. Srivanshitha from meridian school class:class 4tricy ans- C

Ans 4:

nitin loya from prabhat kids, Akola

Class : Class 4

very hard -ans A

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Rajani Prabhakaran from ,

Subject :NSO Class : Class 6

Which of the following statements are false for the root system shown in the given figure?

(i) It is a fibrous root system.
(ii) The branches that arise from the main root are called tap roots.
(iii) It is a tap root system.
(iv) Examples of this type of root system are pea, wheat, banana and turnip.

A(i) and (ii) only
B(ii) and (iv) only
C(iii) and (iv) only
D(i) and (iv) only