|
A pea plant with blue colour flower denoted by BB is cross-bred with a pea plant with white flower denoted by ww
|
|
2
|
8271
|
August 17, 2020
|
|
In the given figure, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism it produces a spectrum XY on a screen
|
|
3
|
7502
|
December 8, 2019
|
|
With the help of a chemical equation, explain how a soda-acid fire extinguisher helps in putting out a fire
|
|
2
|
7474
|
August 5, 2019
|
|
Why do metals not evolve hydrogen gas with nitric acid?
|
|
2
|
2099
|
December 27, 2018
|
|
Why is the red light used as a danger signal
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|
5
|
1415
|
December 16, 2018
|
|
How does speciation take place?
|
|
2
|
2289
|
July 16, 2018
|
|
Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain
|
|
1
|
704
|
March 22, 2018
|
|
Give any two uses of kinetic energy
|
|
1
|
1651
|
March 21, 2018
|
|
What are the three limitations which one has to face while dealing with an infectious disease?
|
|
1
|
4176
|
March 21, 2018
|
|
What are the constituents of a balanced diet?
|
|
1
|
577
|
March 21, 2018
|
|
What are the types of food requirements of dairy animals?
|
|
1
|
3862
|
March 20, 2018
|
|
Discuss why pesticides are used in very accurate concentration and in very appropriate manner
|
|
1
|
2871
|
March 20, 2018
|
|
Differentiate between fertilisers and manures
|
|
1
|
5745
|
March 20, 2018
|
|
How is ozone layer useful to us?
|
|
1
|
2358
|
March 20, 2018
|
|
How has the method of ‘artificial selection’ by humans helped in the evolution of different vegetables?
|
|
1
|
4625
|
March 20, 2018
|
|
Explain the ways in which evolutionary relationships can be traced
|
|
1
|
3961
|
March 20, 2018
|
|
What is speciation? List four factors that could lead to speciation
|
|
1
|
9728
|
March 20, 2018
|
|
What are fossils? How are they formed?
|
|
1
|
12795
|
March 20, 2018
|
|
Explain Mendel’s experiment with peas on inheritance of characters considering only one visible contrasting character
|
|
1
|
2685
|
March 20, 2018
|
|
Describe Darwin’s theory of evolution?
|
|
1
|
9726
|
March 20, 2018
|
|
What are the various evidences in favour of evolution?
|
|
1
|
4630
|
March 20, 2018
|
|
How do Mendel’s experiments show that the traits may be dominant or recessive
|
|
1
|
2142
|
March 20, 2018
|
|
In the following crosses write the characteristics of the progeny
|
|
1
|
850
|
March 20, 2018
|
|
Mention any two points of difference between acquired and inherited traits
|
|
1
|
4343
|
March 20, 2018
|
|
Give the basic features of the mechanism of inheritance.?
|
|
1
|
1898
|
March 20, 2018
|
|
Explain with reason why giraffe has long neck
|
|
1
|
1158
|
March 20, 2018
|
|
Does geographical isolation of individuals of a species lead to formation of a new species? Provide a suitable explanation
|
|
1
|
557
|
March 20, 2018
|
|
List three factors that provide evidences in favour of evolution in organisms and state the role of each in brief
|
|
1
|
3401
|
March 20, 2018
|
|
In a cross between plants with pink flowers and plants with white flowers
|
|
1
|
1425
|
March 20, 2018
|
|
Name two homologous structures in vertebrates. Why are they so called?
|
|
1
|
1737
|
March 19, 2018
|
