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प्रश्न
Write short note based upon the information known to you.
Evolution
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उत्तर
Evolution refers to the gradual change that occurs in an organism over a long duration of time. It is a slow-going process that results in the development of the organism. Life originated on Earth about 3.5 billion years ago. It is believed that there might have been a presence of simple elements on earth, which may have given rise to simple organic and inorganic molecules. From these simple molecules, complex molecules like proteins, DNA, etc. may have been formed. Other evolutionary changes may have resulted in the formation of simple cells, and the result of the continuous evolution on earth is the several species of plants and animals that exist on earth. Today, the diversity on earth varies from a unicellular amoeba to a human being and from a unicellular algae like Chlorella to a huge banyan tree.
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संबंधित प्रश्न
Insects, octopus, planaria and vertebrates possess eyes. Can we group these animals together on the basis of eyes that they possess ? Justify your answer giving reason.
What are the different ways in which individuals with a particular trait may increase in a population?
How are the areas of study – evolution and classification – interlinked?
In what way are analogous organs evidence for evolution?
Scientists believe that all life originated in :
(a) the sea
(b) the soil
(c) the ground
(d) the air
A population of red beetles lives in green bushes in a garden. Once during the process of breeding, a green beetle is produced.
(a) State whether the change in colour of beetle is a process of evolution or not.
(b) Can the new colour of green beetle be passed on to its next generations?
(c) What will be the advantage (if any) of the green colour to the beetle?
(d) State whether the production of green colour involved a change in genetic material or not.
Read the following statement and justify same in your own words with the help of suitable example.
Human evolution began approximately 7 crore years ago.
Explain the following :
(a) Speciation
(b) Natural Selection
Answer the following question in ‘One’ sentence only:
Define ‘mutation breeding’.
Define the Gene pool.
Define the Gene frequency.
Short answer question.
Draw a graph to show that natural selection leads to disruptive change.
The first systematic explanation of the concept of evolution was given by ______.
Name any three types of postmating isolating mechanisms.
Explain stabilizing, directional and disruptive selection with examples.
Theory of inheritance of acquired character was given by:
Which of the following is the correct pair?
Which one of the following was not given by Darwin's theory of evolution?
