CBSE Class 10   Class 10 Science

About the Class 10 Science category (1)
What are the necessary conditions to see an object ? What is light? (2)
Suggest a test to find the hardness of water and explain the procedure (2)
Which rule is violated in the electronic configuration ${{1s}^{0}}$ ${{2s}^{2}}$ ${{2p}^{4}}$? (2)
A brown substance X on heating in air forms a substance Y (3)
How does speciation take place? (2)
Five resistors are connected in a circuit as shown in figure (3)
Managenent of natural resources (1)
An element X on reaction with O2 forms X2O (3)
A white salt of lead on heating decomposes to give brown fumes and a residue is left behind. (i) Name the salt. (ii) Write the equation for the decomposition reaction (2)
Write the balanced chemical equations for the following reactions and identify the type of reaction in each case. (i) In thermite reaction, iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide (3)
How is brain in the human beings protected from injuries? (2)
How has the method of ‘artificial selection’ by humans helped in the evolution of different vegetables? (1)
Explain the ways in which evolutionary relationships can be traced (1)
What is speciation? List four factors that could lead to speciation (1)
What are fossils? How are they formed? (1)
Explain Mendel’s experiment with peas on inheritance of characters considering only one visible contrasting character (1)
Describe Darwin’s theory of evolution? (1)
What are the various evidences in favour of evolution? (1)
How do Mendel’s experiments show that the traits may be dominant or recessive (1)
In the following crosses write the characteristics of the progeny (1)
Mention any two points of difference between acquired and inherited traits (1)
Give the basic features of the mechanism of inheritance.? (1)
Explain with reason why giraffe has long neck (1)
Does geographical isolation of individuals of a species lead to formation of a new species? Provide a suitable explanation (1)
List three factors that provide evidences in favour of evolution in organisms and state the role of each in brief (1)
In a cross between plants with pink flowers and plants with white flowers (1)
Name two homologous structures in vertebrates. Why are they so called? (1)
“It is possible that a trait is inherited but may not be expressed.” Give a suitable example to justify this statement (1)
Name the organism Mendel used for his experiments (1)