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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.
APPEARS IN
संबंधित प्रश्न
Give an example of characteristics being used to determine how close two species are in evolutionary terms.
What is meant by dominant genes and recessive genes? Give one example of each.
Out of the wing of a bird, wing of an insect and the wing of a bat :
which two are homologous organs?
Fill in the following blank with suitable word :
The human forelimb and bat's forelimb are an example of .......... organs whereas an insect's wing and a bat's wing are an example of ........... organs.
Explain the terms 'analogous organs' and 'homologous organs' with examples.
"Only variations that confer an advantage to an individual organism will survive in a population". Do you agree with this statement? Give reason for your answer.
Scientists believe that all life originated in :
(a) the sea
(b) the soil
(c) the ground
(d) the air
According to scientists, aves have evolved from :
(a) mammals
(b) amphibians
(c) reptiles
(d) arthropods
Out of the wing of a bird, wing of an insect and the wing of a bat :
which two are analogous organs?
Explain the following :
(a) Speciation
(b) Natural Selection
Short answer question.
What is disruptive selection?
The first systematic explanation of the concept of evolution was given by ______.
Transfer of a part of chromosome or set of genes to a non-homologous chromosome is called ________.
Name any three types of postmating isolating mechanisms.
Theory of inheritance of acquired character was given by:
Which one of the following was not given by Darwin's theory of evolution?
Which fossil animal is considered as the connecting link between reptiles and birds? Give any one character of each class found in it.
