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प्रश्न
Give scientific reason.
Vertebrates have slowly originated from invertebrates.
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उत्तर
- The Carbon dating technique used to assess the age of fossils indicated that invertebrates were present on the earth much before the vertebrates.
- Fossils of invertebrates are found buried deep as they are very old and belong to the Palaeozoic era.
- The Cenozoic era showed the presence of mammals and birds. Their fossils were seen in the upper strata of the earth’s crust.
- It was also observed that vertebrates are more complexed than invertebrates.
Therefore, it can be said that vertebrates have slowly originated from invertebrates.
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संबंधित प्रश्न
Give two examples of vestigial organs in human beings and plants.
Differentiate between homology and analogy. Give one example of each.
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
Can the wing of a butterfly and the wing of a bat be considered homologous organs? Why or why not?
Attempt giving a clear definition of the term species.
Give the importance of fossil in support of organic evolution
Explain with an example for the given, how the following provides evidence in favor of evolution in organisms :
Analogous organs
What are homologous organs?
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.
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
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
X, Y, and Z are three animals. The animal X can fly but animal Y can only run on ground or walls. The forelimbs of animals X and Y have the same basic design but they are used for different purposes such as flying and running respectively. The animal Z became extinct an long time ago. The study of fossils of Z tells us that it had some features like those of X and some like those of Y. In fact, Z is said to form a connecting link in the evolutionary chain of X and Y.
(a) What could the animals X, Y and Z be?
(b) What name is given to the forelimbs like those of X and Y which have the same basic design but different functions?
(c) Name one feature in which Z resembled X.
(d) Name one feature in which Z resembled Y.
(e) Which is the correct evolutionary chain involving X, Y and Z : X → Z → Y or Y → Z → X?
Vestigial organ ______ present in human body is proof of evolution.
Write short notes based upon the information known to you.
Connecting link
Write the names of those animals in whom some vestigial organs in human body are functioning.
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
_______ is a connecting link between Annelida and Arthropoda.
Differentiate between connecting links and the missing links.
Enlist the evidences of evolution.
Observe the given images and answer the following questions.
- Which evolutionary evidence does it indicate?
- What does it prove?
- State another example of evolutionary evidence.
Explain any five types of evidence that support the theory of evolution.
Biogenetic law states that ______.
Which of these is not a vestigial organ in human beings?
The fossil remains of Archaeopteryx is a connecting link between ______
Palaeontological evidence for evolution refers to the ______.
Which is not a vestigial organ in a man?
What were the characteristics of life forms that had been fossilised?
How do we compute the age of a living tree?
While creation and presence of variation is directionless, natural selection is directional as it is in the context of adaptation. Comment.
I am the connecting link of annelida and arthropoda. What is my name?
Define Palaeontology.
Pick the odd man out:
Write names of some vestigial organs in the human body.
