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प्रश्न
What is carbon dating?
What is meant by carbon dating?
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उत्तर
- Carbon consumption of animals and plants stops after death and only the decaying processes of C-14 take place continuously.
- The ratio of C-14 to C-12 changes constantly with time as C-12 is nonradioactive in dead plants and animals.
- The time passed since the death of a plant or animal can be calculated by carbon dating i.e. by measuring the radioactivity of C-14 and the ratio of C-14 to C-12 present in the remains of the dead organism.
संबंधित प्रश्न
Study the following statements:-
I. Wings of birds and wings of bats are homologous organs.
II. Wings of birds and wings of insects are modified forelimbs.
III. Wings of birds and wings of insects are analogous organs.
IV. Wings of birds and forelimbs of horse are homologous organs.
The correct statements are
(A) I and II
(B) II and III
(C) III and IV
(D) I and IV
“Two areas of study namely 'evolution' and 'classification' are interlinked'. Justify this statement.
Attempt giving a clear definition of the term species.
Name the scientists who Discovered the fossil of Australopithecus
How do homologous organs help in providing evidence for organic evolution?
Human tailbone is a vestigial organ. Explain.
The forelimbs of a frog, a bird and a man show the same basic design (or basic structure) of bones. What name is given to such organs?
The wings of a housefly and the wings of a sparrow are an example of :
(a) analogous organs
(b) vestigial organs
(c) respiratory organs
(d) homologous organs
Read the following statement and justify the same in your own words with the help of a suitable example.
There is evidence of foetal science among chordates.
Answer the following question.
Wisdom teeth : Vestigial organs :: Lungfish : ....................
The most common types of fossils are ------------------------.
Draw a labelled diagram of T.S. of a leaf showing Kranz anatomy.
What do you mean by vestigial structures? Name four vestigial organs found in man.
What are homologous structures?
Very short answer question:
What is vestigeal organ?
The decaying process of C-14 occurs continuously in dead organisms only.
Give scientific reason.
Duck-billed platypus shows relationship with mammals.
Observe the following images and answer the questions.
- Which evolutionary evidences are indicated in the given picture?
- How are they formed?
- Which method is used to measure their age or their time?
You have studied the story of Peppermoths in England. Had the industries been removed, what impact could it have had on the moth population? Discuss.
Industrial melanism was highlighted by ______.
