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प्रश्न
Write short notes based upon the information known to you.
Evolution
उत्तर
Evolution: Evolution refers to the gradual change which occurs in an organism over a long duration of time. It is a slow going process which 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 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 which exist on earth. Today, the diversity on earth varies from unicellular Amoeba to a human being and from a unicellular algae like Chlorella to huge Banyan tree.
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संबंधित प्रश्न
Give an example of characteristics being used to determine how close two species are in evolutionary terms.
Give any two distinctive features of Dryopithecus.
What are genes? Where are the genes located?
State one characteristic which shows that the birds are very closely related to dinosaurs.
Out of the wing of a bird, wing of an insect and the wing of a bat :
which two are homologous organs?
What is meant by acquired and inherited traits? Explain with one example each.
In what way are homologous organs evidence for evolution?
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.
Answer the following question in ‘One’ sentence only:
Define ‘mutation breeding’.
List two differences between acquired traits and inherited traits by giving an example of each.
Very short answer question.
Define the Gene pool
Very short answer question.
Define Organic evolution.
Name any three types of premating isolating mechanisms.
Name any three types of postmating isolating mechanisms.
The sequence of gradual changes which takes place in the primitive organisms over millions of years in which new species are produced is known as ______
The chronological order of human evolution from early to recent stages is ______.
Which fossil animal is considered as the connecting link between reptiles and birds? Give any one character of each class found in it.
Define the following term:
Evolution
