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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
State the connecting links between Peripatus with Annelida and Arthopoda.
Give two examples of vestigial organs in human beings and plants.
(a) Select the homologous structures from the combinations given below:
(i) Forelimbs of whales and bats
(ii) Tuber of potato and sweet potato
(iii) Eyes of octopus and mammals
(iv) Thorns of Bougainvillea and tendrils of Cucurbita
(b) State the kind of evolution they represent.
If you are asked to select a group of two vegetables, out of the following, having homologous structures which one would you select?
(a) Carrot and radish
(b) Potato and sweet potato
(c) Potato and tomato
(d) Lady finger and potato
Differentiate between analogy and homology giving one example each of plant and animal respectively.
Which of the following is a correct set of homologous organs?
(a) Forelimbs of frog, bird and lizard
(b) Spine of cactus and thorn of bougainvillea
(c) Wings of bat and wings of butterfly
(d) Wings of a bird and wings of a bat
Which one of the following pairs of vegetables is an example of homologous structures?
(A) Potato and sweet potato
(B) Carrot and radish
(C) Carrot and tomato
(D) Tomato and radish
Explain with an example for the given, how the following provides evidence in favor of evolution in organisms :
Fossils
Human tailbone is a vestigial organ. Explain.
Differentiate between analogous and homologous structures.
Name two animals having homologous organs and two having analogous organs. Name these organs.
Out of bacteria, spider, fish and chimpanzee, which organism has a better body design in evolutionary terms? Give reason for your answer.
Wing of an insect and forelimb of a bird are :
(a) analogous organs
(b) analeptic organs
(c) homologous
(d) homophobic organs
The presence of which of the following types of organs in two animals indicates that they are not derived from a common ancestor?
(a) homologous organs
(b) excretory organs
(c) analogous organs
(d) reproductive organs
One pair of organs in the following animals are not homologous. This is :
(a) forelimbs in humans and lizard
(b) forelimbs in lizard and frog
(c) wings in butterfly and bat
(d) wings in bat and bird
What do we call the degenerated or partially developed useless organs in living organisms? Enlist such organs in human body? How the same organs are useful in other animals?
Observe the picture and answer the following questions.
A) Which evidence of evolution is shown in the picture?
B) What can be proven with this proof?
C) Give one more example of evidence of evolution
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.
Define phylogeny.
Find an odd one out.
Find an odd one out.
Name the parts shown in the diagram.
Human jaw
The decaying process of C-14 occurs continuously in dead organisms only.
Enlist the evidences of evolution.
Which evidence of evolution is shown in the given picture? Explain the importance of this evidence.
The degenerated and non-functional organs found in an organism are called ______.
Evolution has exhibited a greater stability of molecular structure when compared with morphological structures. Comment on the statement and justify your opinion.
Tendons and ligaments are examples of ______.
Basic principles of embryonic development were pronounced by:
The presence of gill slits, in the embryos of all vertebrates, supports the theory of ______.
Flippers of Penguins and Dolphins are examples of:
Did aquatic life forms get fossilised? If, yes where do we come across such fossils?
Complete the following diagram:
Write down the difference between homologous and analogous organs.
Evolutionary convergence is the development of a ______.
Industrial melanism was highlighted by ______.
Complete the following conceptual picture:
Give one example of homologous organs found in plants.
