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प्रश्न
Read the following statement and justify the same in your own words with the help of suitable examples.
Study of fossils is an important aspect of study of evolution.
उत्तर
Fossils are the remains of organisms that once existed on Earth. They represent the ancestors of plants and animals, which are alive even today. Fossils provide evidence of evolution by revealing the characteristics of past organisms and the changes that have occurred in these organisms to give rise to the present organism. Fossils have the same shape as that of the original animal, but their color and texture may vary widely. The color of a fossil depends upon the type of minerals that form it. For example, the fossil of a bone will not have some constituents of the bone in it. It has the same shape as the bone, but it is chemically more like a rock.
Importance of Fossils:
- They inform us about the types of living things that existed in the past.
- They inform us about the extent to which living things have changed over time.
- The most recent fossil is found in a rock nearest to earth’s surface. Therefore, they inform us about the time when a particular life form existed.
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संबंधित प्रश्न
List three distinguishing features, in tabular form, between acquired traits and the inherited traits.
Explain the following:- Natural Selection
Give the respective scientific terms used for studying the mechanism by which variations are created and inherited
What are the different ways in which individuals with a particular trait may increase in a population?
What is meant by acquired and inherited traits? Explain with one example each.
In what way are homologous organs evidence for evolution?
In what way are analogous 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.
Complete the statement by choosing correct options from below .
Evolution means -- -- -- --.
Very short answer question.
Define Organic evolution.
Short answer question.
Write a note on Genetic drift.
Transfer of a part of chromosome or set of genes to a non-homologous chromosome is called ________.
Name any three types of premating isolating mechanisms.
Theory of inheritance of acquired character was given by:
Genetic drift is change of:
Variations during mutations of meiotic recombinations are ______.
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.
