Identify the Following Pairs as Homologous and Analogous Organs: - Biology


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



(i) Analogous organs
(ii) Analogous organs
(iii) Homologous organs
(iv) Homologous organs

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2013-2014 (March) Delhi Set 3

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Mammals : _________ : : Amphibia : Fishes

What are vestigial organs?

Explain with an example for the given, how the following provides evidence in favor of evolution in organisms :

Homologous organs

Given below is the list of vegetables available in the market. Select from these the two vegetables having homologous structures:

Potato, sweet potato, ginger, radish, tomato, carrot, okra (Lady’s finger)

(A) Potato and sweet potato

(B) Radish and carrot

(C) Okra and sweet potato

(D) Potato and tomato

Study the following statements:-

I. Wings of birds and wings of bats are homologous organs.

II. Wings of birds and wings of insects are modified forelimbs.

III. Wings of birds and wings of insects are analogous organs.

IV. Wings of birds and forelimbs of horse are homologous organs.

The correct statements are

(A) I and II

(B) II and III

(C) III and IV

(D) I and IV

Which of the following pairs of two vegetables represent the correct homologous structures?

(A) Sweet potato and potato

(B) Sweet potato and tomato

(C) Carrot and potato

(D) Radish and carrot

Select two pairs from the following which exhibit divergent evolution. Give reasons for your answer.

(i) Forelimbs of cheetah and mammals

(ii) Flippers of dolphins and penguins

(iii) Wings of butterflies and birds

(iv) Forelimbs of whales and mammals

Four students P, Q, R and S differently reported the following set of organs to be analogous :

P. Forelimb of a frog and forelimb of a lizard

Q. Forelimb of a bird and forelimb of a human

R. Wings of a parrot and wings of a butterfly

S. Wings of a bird and wings of a bat

The two students who have reported correctly are :

(A) P and Q

(B) Q and R

(C) R and S

(D) P and S

 An example of homologous organs is

Find out from newspapers and popular science articles any new fossil discoveries or controversies about evolution.

Try to trace the various components of human evolution (hint: brain size and function, skeletal structure, dietary preference, etc.)

Enlist any four sequential evolutionary names of human ancestors.

Name the scientists who Discovered the fossil of Australopithecus

Explain the evolution of giraffe's neck according to Lamarck's theory of evolution.

Name any two temporary embryonic structures in vertebrates which provide evidence for evolution.

What are homologous organs?

How do homologous organs help in providing evidence for organic evolution?

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

There are five animals A, B, C, D and E. The animal A uses its modified forelimbs for flying. The animal B uses its forelimbs for running whereas the animal C uses its forelimbs for grasping. The animal D can live on land as well as in water and uses its forelimbs to prop up the front end of its body when at rest. The animal E which respires by using spiracles and tracheae uses wings for flying but its wings are analogous to the modified forelimbs of animal A.
(a) What could the animals A, B, C, D and E be?
(b) Why are the forelimbs of animals A, B, C, D called homologous organs?
(c) What does the existence of homologous organs in animals A, B, C and D tell us about their ancestors ?
(d) Why are the modified forelimbs of animal A and the wings of animal E called analogous organs?
(e) State whether animals A and E have a common ancestor or not.

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?

Read the following statement and justify same in your own words with the help of suitable example.

There is evidences of fatal science among chordates.

Write short notes based upon the information known to you.


Write short notes based upon the information known to you.

Connecting link

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 : ....................

Complete the following chart:

With the help of diagrams, describe emasculation and bagging. 

The most common types of fossils are ------------------------. 

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.

Choose the correct option of the following question:

Wings of Insect and Birds are examples of :

Explain any three molecular (genetic) evidences in favour of organic evolution.

Define fossils. 

Differentiate between connecting links and the missing links.

Define phylogeny.

Very short answer question.

What is vestigeal organ?

Short answer question.

Give the significance of fossils.

Explain the importance of Anatomical evidences with examples.

_____________ is a vestigial organ in human beings.

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 : ____________

The decaying process of C-14 occurs continuously in dead organisms only.

Write a short note:

Embryological evidences

Observe the given images and answer the following questions.

  1. Which evolutionary evidence does it indicate?
  2. What does it prove?
  3. State another example of evolutionary evidence.

Which evidence of evolution is shown in the given picture? Explain the importance of this evidence.

Explain any five types of evidence that support the theory of evolution.

Write the answers to the questions by observing the figure below.

(a) (b) (c)
  1. Write the name of the animal ‘(a)’ in the figure.
  2. Write the name of the animal ‘(b)’ in the figure.
  3. Write the name of the animal ‘(c)’ in the figure.
  4. Which evolutionary evidence is illustrated by this figure?
  5. Write the definition of that evidence for evolution.

Biogenetic law states that ______.

The degenerated and non-functional organs found in an organism are called ______.

A human hand, a front leg of a cat, a front flipper of a whale and a bat’s wing look dissimilar and adapted for different functions. What is the name given to these organs?

How do you differentiate homologous organs from analogous organs?

Select vestigial organs from the following.

Homologous organs and vestigial organs are examples of ______ type of evidence in evolution.

Select the correct statement.

Select the CORRECT match.

Select the CORRECT set of homologous organs.

Why do all the gametes formed in human females have an X chromosome?

Homologous organs are:

Cucurbits do not develop thick and woody stem as they are:

Tendons and ligaments are examples of ______.

Palaeontological evidence for evolution refers to the ______.

Basic principles of embryonic development were pronounced by:

Study of fossils is ______.

Evolutionary convergence is the development of:

The process of mating of individuals, which are more closing related than the average of the population to which they belong is called ______.

The presence of gill slits, in the embryos of all vertebrates, supports the theory of ______.

Which is not a vestigial organ in a man?

Flippers of Penguins and Dolphins are examples of: 

The study of fossil evidence of evolution is called ______

Organs having similar functions but different origin and development are known as:

Which of the following is used as an atmospheric pollution indicator?

Animal husbandry and plant breeding programmes are the examples of ______.

The bones of forelimbs of whale, bat, cheetah and man are similar in structure, because ______.

Appearance of antibiotic-resistant bacteria is an example of ______.

Give an example for convergent evolution and identify the features towards which they are converging.

How do we compute the age of a rock?

While creation and presence of variation is directionless, natural selection is directional as it is in the context of adaptation. Comment.

Complete the following diagram:

Complete the following chart:

I am the connecting link of annelida and arthropoda. What is my name?

What is the function of the appendix of our digestive system?

Find odd one out:

Write down the difference between homologous and analogous organs.

Find the odd one out:

Explain natural selection with the example of industrial melanism.

Write a note on the significance of Palaeontology.

Define the term:

Homologous organs

Industrial melanism was highlighted by ______.

Write names of some vestigial organs in the human body.


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