National Science Olympiad Forum By SOF Olympiad Trainer - Page 30
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Divyamsh from The Sky World School, Panchkula
Subject :NSO    Class : Class 3

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Sunita Kundu from Scholars rosary senior secondary school , Rohtak
Subject :NSO    Class : Class 10

In a plant, smooth seeds (S) are dominant over wrinkled seeds (s) and green seeds (G) are dominant over yellow seeds (g). A plant homozygous for smooth and green seeds is crossed with a plant having wrinkled and yellow seeds. The F1 offsprings are self crossed to produce F2 generation. If a total of 160 offsprings are produced, how many plants are expected to be having wrinkled and green seeds in F2 generation, according to a typical Mendelian cross?

A 90
B 30
C 20
D 10

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Ansh Sahai from Samsara The World Academy , Greater noida
Subject :NSO    Class : Class 6

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Rishaan Dixit from DPS Noida, Noida
Subject :NSO    Class : Class 4

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Rishaan Dixit from DPS Noida, Noida
Subject :NSO    Class : Class 4

Which of the following statements is/are incorrect regarding the given figures X and Y?

1. X depends partly on animals for food but can also make its own food while Y cannot make its own food.
2. X has chlorophyll while Y does not contain chlorophyll and is non-green.
3. In X, food is prepared by the green stem, whereas Y obtains its food from dead and decaying plants and animals.
4. X and Y have patches of green colour. Only green part of their leaves performs photosynthesis.

A1, 3 and 4 only
B2 and 3 only
C1 and 4 only
D3 and 4 only


b

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Vihan S from NPSI, Singapore
Subject :NSO    Class : Class 5

Read the given statements and select the correct option.
Statement 1 : Physical change does not affect the composition of matter.
Statement 2 : Chemical change results in the formation of new substance with different properties.

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.


How

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rahul from euroschool, Mumbai
Subject :NSO    Class : Class 7

A scientist took a metal rod and a wooden rod and wrapped each of them in a piece of paper. These were then heated as shown. It was found that the paper around the metal rod does not burn whereas the one around the wooden rod catches fire. It is because


AMetal being a good conductor, conducts away the heat given to the paper
BWood being an insulator, takes away all the heat
CCandle in case of iron rod, is near to the paper
DNone of these.


the explanation is not given

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Raghav Srinivasan from new horizon, bangalore
Subject :NSO    Class : Class 3

Ans 1:

Raghav Srinivasan from new horizon, bangalore
Class : Class 4

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Y from Rainbow , Jaipur
Subject :NSO    Class : Class 9

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Subhang Deep Sahu from Chrysalis High Kadugodi . , Bangalore
Subject :NSO    Class : Class 6

Refer to the given graph plotted for three different fabric pieces of equal size P, Q and R on the basis of their water absorbing capacity and select the correct statement.


AP is made up of fibres obtained from Gossypium plant whereas R is made up of fibres obtained from an insect.
BQ is made up of protein fibres obtained from an insect whereas R is made up of cellulose fibres obtained from flower of a plant.
CR is made up of fibres obtained from plant stem by the process of retting whereas P is made up of fibres obtained from plant seed by the process of ginning.
DP is biodegradable whereas Q and R are non-biodegradable.


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