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प्रश्न
Give scientific reason.
Duck-billed platypus shows relationship with mammals.
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उत्तर
- The duck-billed platypus is a connecting link between mammals and reptiles.
- It shows similarity with mammals due to the presence of mammary glands and hairs.
Therefore, Duck-billed platypus shows relationship with mammals.
संबंधित प्रश्न
What are vestigial organs?
Give two examples of vestigial organs in human beings and plants.
Differentiate between homology and analogy. Give one example of each.
Explain with an example for the given, how the following provides evidence in favor of evolution in organisms :
Homologous organs
With the help of any two suitable examples explain the effect of anthropogenic actions on organic evolution.
Four students A, B, C and D reported the following set of organs to be homologous. Who is correct ?
(A) Wings of a bat and a butterfly
(B) Wings of a pigeon and a bat
(C) Wings of a pigeon and a butterfly
(D) Forelimbs of cow, a duck and a lizard
Enlist any four sequential evolutionary names of human ancestors.
Explain with an example for the given, how the following provides evidence in favor of evolution in organisms :
Fossils
Name two animals having homologous organs and two having analogous organs. Name these organs.
The presence of which of the following types of organs in two organisms indicates that they are derived from the same ancestor?
(a) analogous organs
(b) respiratory organs
(c) digestive organs
(d) homologous 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
In a class, students were asked to observe the models/slides/pictures of the skeletons of forelimbs and wings of different organisms. After the observations the students made the following groups of homologous structures. Select the correct group :
(A) Wings of a bird and a butterfly
(B) Wings of a pigeon and a bat
(C) Wings of a butterfly and a bat
(D) Forelimbs of a cow, a duck and a lizard
Explain with suitable examples importance of anatomical evidence in evolution.
Complete the following chart:
Draw a labelled diagram of T.S. of a leaf showing Kranz anatomy.
Explain any three molecular (genetic) evidences in favour of organic evolution.
Define phylogeny.
Very short answer question:
What is vestigeal organ?
The decaying process of C-14 occurs continuously in dead organisms only.
Give scientific reason.
Peripatus is said to be the connecting link between Annelida and Arthropoda.
Write a short note:
Embryological evidences
Enlist the evidences of evolution.
Biogenetic law states that ______.
How do you differentiate homologous organs from analogous organs?
Select the correct statement.
Select the CORRECT set of homologous organs.
Evolution has exhibited a greater stability of molecular structure when compared with morphological structures. Comment on the statement and justify your opinion.
Homologous organs are:
Cucurbits do not develop thick and woody stem as they are:
What were the characteristics of life forms that had been fossilised?
How do we compute the age of a living tree?
How do we compute the age of a fossil?
Give a scientific reason.
Morphological evidences suggest that dog, sheep and wolf have a common origin.
As shown in figure below some organisms that share a common ancestor have features that have different functions, but similar structures.
These are known as ______. Give example.
Industrial melanism was highlighted by ______.
Give one example of homologous organs found in plants.
