CBSE Class 10th Science Solved Practice Paper 2015

Find CBSE Class 10th Physics Solved Practice Paper 2015. These Practices have been solved as per the standards followed by CBSE while solving their Practice Paper.

A few Practices from this Set are given below:

Q. What is the name of asexual reproduction method in:
   i) Spirogyra, and   ii) Leishmania?

Solution:
   i) Spirogyra reproduces by fragmentation.
  ii) Leishmania reproduces by binary fission.

Q. What are homologous organs? Illustrate with suitable examples, how is the process of evolution related to homologues organs?

Solution:
Homologous organs – The organs that are similar in origin but perform different functions are called Homologous organs.
For example, the fore limbs of humans and the wings of birds look different externally but their skeletal structure is similar. Wings of birds are the modification of forearms. The two perform two different function – wings help in flight whereas human forearm helps in various functions. Thus, the presence of homologous organs in different animals provides evidence for evolution by telling us that they are derived from the same ancestor who had the ‘basic design’ of the organ on which all the homologous organs are based.

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