National Science Olympiad Forum By SOF Olympiad Trainer

Mani Gupta from Carmel Convent School, Faridabad

Subject :NSO Class : Class 8

Ms. Rashmita, a science teacher has set up an experiment as shown in the figure.

Which of the following represent the correct observations?
(i) Both the metal strips dissolve in beaker II.
(ii) Colour change is observed in beaker I.
(iii) No reaction takes place in beaker III.
(iv) Fe strip will dissolve faster in beaker I.
(v) Reaction occurs in beaker III but no colour change is observed.

A (iii) and (iv) only
B (i) and (iii) only
C (ii) and (v) only
D None of these

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Ans 1:

Ani from Sav, Kolkata

Class : Class 9

B

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Shruti Rajshree from NPS Indiranagar, Bengaluru

Subject :NSO Class : Class 5

What could possibly be the observation of the given activity?

ADroplets of water appear in the polythene bag and on the leaves.
BDroplets of water appear in the polythene bag but not on the leaves.
CDroplets of water appear on the leaves but not in the polythene bag.
DNo droplets of water appear in the polythene bag and on the leaves.

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Ans 1:

CHIRAG KHORIA from EVERGREEN PUBLIC SCHOOL, MAYNAGURI

Class : Class 5

SOF, Isnt the answer C?

Ans 2:

Pratham Dave from GNS, Bangalore

Class : Class 7

Why D?It should be option C .

Ans 3:

Pratham Dave from GNS, Bangalore

Class : Class 7

C is the answer to this question because the leaves are uncovered

Ans 4:

Shreyan from Delhi Public School Bangalore East, Bangalore

Class : Class 5

isn't the answer c

Ans 5:

Navya GUPTA from dps noida, Noida

Class : Class 3

Ans 6:

Ayushree Barman from Sri Sri Academy, Kolkata

Class : Class 6

Why will it be D? It should be C, because the Vaseline blocks the stomata of the leaves, and thus blocks the surface for transpiration, so water droplets will not appear on those leaves, but the uncovered leaves were not stained or covered with anything, so the transpiration process in those leaves should stay normal.

Ans 7:

CHIRAG KHORIA from EVERGREEN PUBLIC SCHOOL, MAYNAGURI

Class : Class 5

Ans 8:

Kanishk Mukherjee from BDM International, Kolkata

Class : Class 6

Ans 9:

munish jindal from APJ school, Jalandhar

Class : Class 8

Ans 10:

AREEN from BOLTON, HYDERABAD

Class : Class 6

Ans is C because like humans, plants also sweat. This is called transpiration.

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Anshuman D from MVM, Hyderabad

Subject :NSO Class : Class 7

Rahul put his timepiece on the table in such a way that at 6 p.m. hour-hand points to West. In which direction the minute-hand will point at 9.15 p.m.?

A South-East
B North
C West
D South

I think my answer is right

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Ans 1:

Pranathi from GIIS, Kuala Lumpur

Class : Class 7

D

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subhang sarkar from Aditya Academy, Kolkata

Subject :NSO Class : Class 3

Select the correct option regarding the organ system shown here

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

Study at the given classification chart. How are the following plants grouped?

A
B
C
D

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Ans 1:

Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Class : Class 10

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Sambhavi nayak from DAV Public school, Cuttack

Subject :NSO Class : Class 8

Refer to the given food web.

If a non-biodegradable insecticide known as DDT was sprayed onto the pine tree, in which of the following organisms will most of the DDT eventually accumulate?

A Golden-crowned kinglet
B Snake
C Red-tailed hawk
D Oak acorns

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Ans 1:

Student from School, City

Class : Class 8

Option B -- Golden Crowned Kinglet gets eaten by the snake so the snake is the top consumer and it should be option B.

Ans 2:

Kushagra Kishore from Chrysalis High, Bengaluru

Class : Class 10

should be option A

Ans 3:

Aryan Keswani from Delhi Public School, Mathura Road, New Delhi

Class : Class 10

Option B - snake. because golden crowned kinglet is sadly eaten by the snake, so snake is the top consumer

Ans 4:

Bhumi Chheda from SVKM J V Parekh International School, Mumbai

Class : Class 9

it should be option A

Ans 5:

ishaan parikh from ahmedabad international school, ahmedabad

Class : Class 8

It should be option A!

Ans 6:

Sriyansh from Surabhi , Hosapete

Class : Class 9

A substance which constantly gets accumulated in any organism of the food chain gets amplified highest in the topmost predator.This is a rule that can be observed in each and every case of bioamplification in an food web or chain. As the golden crowned kinglet is the topmost predator, option a is correct.