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प्रश्न
What is 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.
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संबंधित प्रश्न
Give two examples of vestigial organs in human beings and plants.
With the help of any two suitable examples explain the effect of anthropogenic actions on organic evolution.
“Two areas of study namely 'evolution' and 'classification' are interlinked'. Justify this statement.
Explain the evolution of giraffe's neck according to Lamarck's theory of evolution.
Name two animals having homologous organs and two having analogous organs. Name these organs.
The organs which perform different functions but have the same basic structure are known as :
(a) homologous organs
(b) analogous organs
(c) homolytic organs
(d) analytic organs
You have potato, carrot, radish, sweet potato, tomato and ginger bought from the market in your jute bag. Identify two vegetables to represent the correct homologous structures.
(A) Potato and tomato
(B) Carrot and tomato
(C) Potato and sweet potato
(D) Carrot and radish
Answer the following question.
Wisdom teeth : Vestigial organs :: Lungfish : ....................
Draw a labelled diagram of T.S. of a leaf showing Kranz anatomy.
Define fossil.
Differentiate between connecting links and the missing links.
What are homologous structures?
Short answer question.
Give the significance of fossils.
Long answer question.
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Find an odd one out.
I am a connecting link between reptiles and mammals. Who am I?
Name the parts shown in the diagram.
Human jaw
Appendix : vestigial organ : : Peripatus : ____________
Complete the flowchart.
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?
Select vestigial organs from the following.
Homologous organs and vestigial organs are examples of ______ type of evidence in evolution.
Where is carbon dating used?
The study of fossil evidence of evolution is called ______
Organs having similar functions but different origin and development are known as:
Animal husbandry and plant breeding programmes are the examples of ______.
Appearance of antibiotic-resistant bacteria is an example of ______.
What were the characteristics of life forms that had been fossilised?
Give an example for convergent evolution and identify the features towards which they are converging.
I am the connecting link of annelida and arthropoda. What is my name?
Give a scientific reason.
Morphological evidences suggest that dog, sheep and wolf have a common origin.
Find the odd one out:
Evolutionary convergence is the development of a ______.
Pick the odd man out:
