National Science Olympiad Forum By SOF Olympiad Trainer - Page 409

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Saiesh from Sindhi high school, Bangalore

Subject :NSO Class : Class 4

Advika took a Croton plant with shaded leaves and set up an experiment as shown here. She kept the plant first in darkness for a few hours and then placed it in sunlight. After 6 hours, she performed iodine test on plucked leaves P, Q and R. Which of the following is the possible outcome? (Note : Shaded portion in the question figure indicates green colour and in the options, it indicates blue-black colour.)

A - Leaf Q
B - Leaf Q
C - Leaf R
D - Leaf P

Correct answer is D since the CO2 obsorbent is present in Leaf P.When the outer circle is not present,it does not mean the leaf cannot prepare starch.The picture depiction is confusing.

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Ans 1:

Rudransh Shukla from Delhi Public School, Chandigarh

Class : Class 5

Ans 2:

Chinmayee from Dimensions , Singapore

Class : Class 4

The correct answer is D

Ans 3:

Chinmayee from Dimensions , Singapore

Class : Class 4

I mean D, and I think it is D : )

Ans 4:

Rishan Sandeep Gadhia from Orchids International, Mumbai

Class : Class 8

yes, the answer will be (a) as when we take such a leaf only the green part will be containing starch as it has chlorophyll in it and the other part does not , this is why only the green part will have the ingredients to make glucose(starch)and once iodine is added it turns blue and black

Ans 5:

Ashwak from Cambridge, Jalandhar

Class : Class 9

The answer is A

Ans 6:

SAI KRISHNA from SHISHYA BEML PUBLIC SCHOOL, BANGALORE

Class : Class 3

Ans 7:

Ishrita Rai from Sanskriti, pune

Class : Class 8

THE CORRECT ANSWER IS (A)

Ans 8:

A Venkata Sai Pranav from Podar International School, Bhusawal

Class : Class 9

answer is A

Ans 9:

Naitik from Delhi Public School Noida, Noida

Class : Class 4

Ans 10:

Devanshi from Dps, Hyderabad

Class : Class 4

Answer is A

Ans 11:

Ashwak from Cambridge, Jalandhar

Class : Class 9

The answer is A

Ans 12:

Shreshta from Presidium, Ghaziabad

Class : Class 3

I think the answer is [A]

Ans 13:

SAI KRISHNA from SHISHYA BEML PUBLIC SCHOOL, BANGALORE

Class : Class 3

the correct answer is a

Ans 14:

Saksham Arora from DPS, Gurugram 102

Class : Class 9

Ans 15:

Khanak Jha from Prime Academy, Mumbai

Class : Class 4

AAAAAAAAAAAAAis the answer

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SIDDHARTH KUMAR CHATTERJEE from NAVY CHILDREN SCHOOL , CHICALIM

Subject :NSO Class : Class 4

Select the option which would most closely resembles the mirror image of the given Fig. (X), if the mirror is placed along MR.

A
B
C
D

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Master Utsav Bhattacharjee from The Emerald Heights International School , Indore

Subject :NSO Class : Class 7

silk was first invented in which country?

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

silk was first invented in ancient China,

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Varsha.K from DAV Public School - Velachery, Chennai

Subject :NSO Class : Class 7

Consider the following statements. Select the option which correctly identifies true (T) and false (F) ones.
(i) Microorganisms act upon the dead plants to produce humus.
(ii) Autotrophs lie at the base of a food chain.
(iii) Large scale cutting of trees is called afforestation.
(iv) Branched part of a tree above the stem is called crown.

	(i)	(ii)	(iii)	(iv)
A	T	F	T	F
B	T	T	F	T
C	T	F	F	T
D	T	F	T	T

But base means last. Doesn't it?

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Ans 1:

Rohan David from Oakridge International school, Hyderabad

Class : Class 7

Ans 2:

SOMDATTA BHATTACHARYA from Delhi Public School, Dhaligaon, Bongaigaon

Class : Class 5

Ans 3:

Advaith from NPS HSR, Bengaluru

Class : Class 7

Ans 4:

Shreyans Mondal from Sri Chaitanya Techno School Kaggadasapura Campus 1, Bengaluru

Class : Class 10

Ans 5:

Varsha.K from DAV Public School - Velachery, Chennai

Class : Class 5

Ans 6:

aritroray from Chirec International School, Hyderabad

Class : Class 8

Ans 7:

Ahaan Mittal from Primus Public School, Bengaluru

Class : Class 8

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Debarpan Das from Delhi Public School , Durgapur

Subject :NSO Class : Class 5

Study the given steps involved in formation of fruit from flower.
P. The ovary develops into a fruit.
Q. The pollen grains grow long tube inside the style.
R. The ovules grow into seeds.
S. The male gametes fuse with the egg.
T. The pollen grains are deposited on the stigma of another flower.
U. The pollen tube enters the ovary.
Select the option which arranges given steps into correct sequence.

AT → U → Q → S → R → P
BQ → T → U → R → S → P
CT → Q → U → S → R → P
DU → Q → T → S → R → P

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Debarpan Das from Delhi Public School , Durgapur

Subject :NSO Class : Class 5

The given table represents the characteristics of three different objects X, Y and Z.

Which of the following could be X, Y and Z?

AX- Plastic bag Y- Cardboard Z- Rubber band
BX- Paper Y- Rubber band Z- Cardboard
CX- Rubber band Y- Sponge Z- Plastic straw
DX- Sponge Y- Cardboard Z- Rubber band

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Debarpan Das from Delhi Public School , Durgapur

Subject :NSO Class : Class 5

Refer to the given table and select the option that correctly identifies P, Q and R.

AP- Dolphin Q- Whale R- Penguin
BP- Polar bear Q- Dolphin R- Duck
CP- Penguin Q- Polar bear R- Duck billed platypus
DP- Duck Q- Penguin R- Whale

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Ans 1:

Shreejith from EuroSchool , Bangalore

Class : Class 7

Ans 2:

Vihaan Patil from Bombay Scottish School, Mahim Mumbai

Class : Class 6

plz explain

Ans 3:

Saket Khurana from DPS E-CITY BENGALURU, BENGALURU

Class : Class 9

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Debojit Sahu from Kendriya vidyalaya paradip port, paradip

Subject :NSO Class : Class 9

Fill up the blanks and select the correct option from the codes given below.
(I)__(i)__ is decomposed mixture of cattle excreta and urine along with straw and fodder.
(II)__(ii)__ is made from vegetable wastes and animal wastes decomposed by aerobic and anaerobic microorganisms.
(III)__(iii)__ is prepared by sowing certain crop seeds and then ploughing them back in the soil.
(IV)__(iv)__ is made by decomposition of plant and animal refuse with the help of earthworms.

(a) (i)Vermi compost (ii)Farmyard manure (iii)Green manure (iv)Compost
(b) (i)Farmyard manure (ii)Compost (iii)Green manure (iv)Vermi compost
(c) (i)Green manure (ii)Compost (iii)Farmyard manure (iv)Vermi compost
(d) (i)Compost Green (ii)manure (iii)Farmyard manure (iv)Vermi compost

super question for nso

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Vartika Agarwal from Phoenix world school, Pune

Subject :NSO Class : Class 6

While measuring the length of a wooden box, the reading at one end is 1.5 cm and the other end is 4.7 cm. What is the length of the wooden box?

A 4.7 cm
B 1.5 cm
C 3.2 cm
D 6.2 cm

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Ans 1:

Vedant Gajare from New Horizon Scholar's School, Airoli

Class : Class 9

Ans 2:

anagh jain from Narayana, Gurgaon

Class : Class 6

c 3.2 cm

Ans 3:

KRITHYA GUPTA from LOTUS VALLEY INTERNATIONAL SCHOOL, NOIDA

Class : Class 7

Ans 4:

Karthik from , ANGUL

Class : Class 6

Ans 5:

Shikhar Mallick from Holy Cross School, Agartala

Class : Class 7

Ans 6:

Sesheta from DAV Centenary Public School, Chander Nagar, Ghaziabad

Class : Class 10

C. 3.2 cm

Ans 7:

aaraadhanaa from innisfree house school, Bangalore

Class : Class 6

Ans 8:

Kavin Karthick M from DPS bangalore east, Bengaluru

Class : Class 6

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Vartika Agarwal from Phoenix world school, Pune

Subject :NSO Class : Class 6

Prashant tested some food items and tabulated the results as follows.

Identify X, Y and Z and select the incorrect statement.

AY helps in formation of haemoglobin which carries oxygen from one part of the body to another.
BX helps in formation of antibodies in our body which fight infection and protect us from diseases.
CSame amount of Z provides more energy as compared to X.
DZ forms shock absorbing cushion around our internal organs.

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Ans 1:

Akshara from sishya OMR , chennai

Class : Class 8

Ans 2:

Adyanika Satpathy from DPS International School, Singapore

Class : Class 9

Ans 3:

Adyanika Satpathy from DPS International School, Singapore

Class : Class 9

Olx

Ans 4:

Vartika Agarwal from Phoenix world school, Pune

Class : Class 9

Ans 5:

Adyanika Satpathy from DPS International School, Singapore

Class : Class 9

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