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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
According to de-Vries what is saltation?
Define evolution. How does it occur?
How are the areas of study – evolution and classification – interlinked?
Out of the wing of a bird, wing of an insect and the wing of a bat :
which two are homologous organs?
Which of the following gas was not present in early earth atmosphere?
(a) Ammonia
(b) Oxygen
(c) Hydrogen sulphide
(d) Methane
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.
Out of the wing of a bird, wing of an insect and the wing of a bat :
which two are analogous organs?
Give one example each of characters that are inherited and the ones that are acquired in humans. Mention the difference between the inherited and the acquired characters.
Write short notes based upon the information known to you.
Evolution
Multiple choice question.
Gene frequency in a population remain constant due to –
Very short answer question.
Define the Gene frequency
Short answer question.
What is disrruptive selection?
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.
____________ results in variation in gene frequencies within population by chance rather than by natural selection.
What is a connecting link?
Define the following term:
Evolution
