National Science Olympiad Forum By SOF Olympiad Trainer - Page 300

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Subject :NSO    Class : Class 4

Rajesh set up an experiment as shown in the figure.

He placed two cockroaches in both the jars X and Y. The cockroaches in jar X were given air and water. The cockroaches in jar Y were given air, water and food. From his experiment Rajesh was trying to find out ___.

AWhether the cockroaches need air to live
BWhether the cockroaches need food to live
CWhether the cockroaches need water to live
DWhether the cockroaches can live together in the dark


b

Ans 1:

Class : Class 4
b

Ans 2: (Master Answer)

Class : Class 1

B


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Subject :NSO    Class : Class 1

Ans 1:

Class : Class 1
HHU JXKDIFUGYFHUIDORIGUHFJIDFDIFJGHJFIGUIRUTG

Ans 2:

Class : Class 1
6YYYYYYYYYYYYYYYYYYYYYYYYYY

Ans 3:

Class : Class 1

Ans 4:

Class : Class 9
In Summer season, sun shines brightly and days are very hot and sunny. We wear cotton clothes. These keep our body cool . We drink Juice to keep ourselves fresh. Thus , the answer to the question is option (b) .

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Subject :NSO    Class : Class 6

Ans 1: (Master Answer)

Class : Class 1

A


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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8

Ans 2:

Class : Class 7

Ans 3:

Class : Class 8

Ans 4:

Class : Class 9

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 7


The given figure shows the longitudinal section of two flowers of the same type. Study the following statements with reference to the given figure.
(i) Z and U show self pollination, whereas Y shows cross pollination.
(ii) W, X and Z show transfer of pollen grains that will result in fruit formation.
(iii) Z shows self pollination, while X shows cross pollination.
(iv) X and Z show pollination that will result in fruit formation.
(v) W, X and Y show cross pollination.Which of the given statements are true or false?

A(i) and (iv) are true; (ii), (iii) and (v) are false.
BOnly (v) is true; rest are false.
C(i), (ii), (iii) and (v) are true; (iv) alone is false.
D(i), (ii) and (v) are false; (iii) and (iv) are true.


Ans 1:

Class : Class 7

Ans 2: (Master Answer)

Class : Class 1

D


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Subject :NSO    Class : Class 6

A scientist conducted a study on four different species of organisms (W, X, Y and Z) that are related in an aquatic food chain. He estimated the total number of individuals in the population of each species and the average biomass of each individual.


Which of the following shows the correct relation of these species in a food chain?

AZ → Y → W → X
BX → W → Z → Y
CX → W → Y → Z
DZ → W → X → Y


Answer should be ABecause Z is eaten by Y, Y should be eaten by W and W should be eaten by X (looking at the biomass and number of individuals)

Ans 1: (Master Answer)

Class : Class 1

A


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Subject :NSO    Class : Class 6

Equal sized square pieces of three different fabrics X, Y and Z were taken and spread out on a floor. Three small similar metal balls were each rolled with equal force from one end diagonally to the other end of fabric piece. Time taken by the balls to reach other end of fabric was noted to be as follows:


Now, select the correct option regarding this.

AFabric Z can be obtained from seeds of a plant and fabric Y can be obtained from stem of a plant.
B Fabric Z can be obtained from the stem of a plant and fabric Y can be obtained from larva of an animal.
CFabric Y can be obtained from the fur of an animal and fabric X can be obtained from larva of an animal.
DFabric Y can be obtained from the fur of an animal and fabric Z can be obtained from larva of an animal.


Correct answer is BBecause Z should be a little rough and Y (silk) should be the smoothest

Ans 1:

Class : Class 10
The answer should be BBecause Z should be rough and Y should be the smoothest (silk)

Ans 2:

Class : Class 10

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Subject :NSO    Class : Class 9

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