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प्रश्न
Write short notes based upon the information known to you.
Connecting link
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उत्तर
Connecting link: Connecting link refers to plant and organisms which show characteristics related to two different groups. For example, Peripatus is considered a connecting link between annelida and arthropoda. It has characteristics like segmented body, thin cuticle and parapodia-like organs which are similar to annelids. It also shows tracheal respiration and open circulatory system which is similar to arthropods. Another example is duck billed platypus which is a connecting link between reptiles and mammals as it lays eggs like reptiles and has mammary glands like mammals.
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संबंधित प्रश्न
(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.
With the help of any two suitable examples explain the effect of anthropogenic actions on organic evolution.
How analogy and homology considered as an evidence in support of evolution ?
An example of homologous organs is
Give the importance of fossil in support of organic evolution
Name any two temporary embryonic structures in vertebrates which provide evidence for evolution.
Out of bacteria, spider, fish and chimpanzee, which organism has a better body design in evolutionary terms? Give reason for your answer.
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
The organs P and Q of two animals have different structures but similar functions. On the other hand, the two organs R and S of two other animals have the same basic structure but different functions.
(a) What are the organs like P and Q known as?
(b) Name the organs like P and Q. Also name the animals which have such organs.
(c) What are the organs like R and S called?
(d) Name the organs like R and S. Also name the animals which have such organs.
Identify the following pairs as homologous and analogous organs:
(i) Sweet potato and potato
(ii) Eye of octopus and eye of mammals
(iii) Thorns of Bougainvillaea and tendrils of Cucurbits
(iv) Fore limbs of bat and whale
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
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
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.
I am a connecting link between reptiles and mammals. Who am I?
Name the parts shown in the diagram.
Human jaw
Give scientific reason.
Duck-billed platypus shows relationship with mammals.
Write a short note:
Embryological evidences
Complete the flowchart.
Biogenetic law states that ______.
How do you differentiate homologous organs from analogous organs?
Define vestigial organs.
Cucurbits do not develop thick and woody stem as they are:
Palaeontological evidence for evolution refers to the ______.
Basic principles of embryonic development were pronounced by:
The study of fossil evidence of evolution is called ______
Analogous organs arise due to ______.
Fossils are generally found in ______.
What were the characteristics of life forms that had been fossilised?
While creation and presence of variation is directionless, natural selection is directional as it is in the context of adaptation. Comment.
The evolutionary story of moths in England during industrialisation reveals, that 'evolution is apparently reversible'. Clarify this statement.
Explain natural selection with the example of industrial melanism.
Write a note on the significance of Palaeontology.
Give one example of homologous organs found in plants.
Define Palaeontology.
