Advertisements
Advertisements
Question
Give scientific reason.
Peripatus is said to be the connecting link between Annelida and Arthropoda.
Advertisements
Solution
- Peripatus is the connecting link between two different groups - Annelida and Arthropoda.
- It shows annelid-like characters such as segmented body, thin cuticle, and parapodia-like organs.
- It also shows arthropod-like characters such as tracheal respiration and open circulatory system.
Therefore, Peripatus is said to be the connecting link between Annelida and Arthropoda.
APPEARS IN
RELATED QUESTIONS
(a) Select the analogous structures from the combination given below:
(i) Forelimbs of whales and bats
(ii) Eyes of octopus and mammals
(iii) Tuber of sweet potato and potato
(iv) Tuber of Bougainvillea and tendrils of Cucurbita
(b) State the kind of evolution they represent
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
Name the scientists who Discovered the fossil of Australopithecus
What are homologous organs?
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.
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 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.
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
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.
Complete the following chart:

With the help of diagrams, describe emasculation and bagging.
What do you mean by vestigial structures? Name four vestigial organs found in man.
Differentiate between connecting links and the missing links.
What are homologous structures?
Find an odd one out.
Appendix : vestigial organ : : Peripatus : ____________
Write a short note:
Embryological evidences
Define the evidence of evolution shown in the figure.

Observe the following images and answer the questions.

- Which evolutionary evidences are indicated in the given picture?
- How are they formed?
- Which method is used to measure their age or their time?
Biogenetic law states that ______.
Where is carbon dating used?
Cucurbits do not develop thick and woody stem as they are:
The process of mating of individuals, which are more closing related than the average of the population to which they belong is called ______.
The study of fossil evidence of evolution is called ______
Animal husbandry and plant breeding programmes are the examples of ______.
Analogous organs arise due to ______.
What were the characteristics of life forms that had been fossilised?
Give an example for convergent evolution and identify the features towards which they are converging.
How do we compute the age of a fossil?
Find the odd one out:
Evolutionary convergence is the development of a ______.
Write a note on the significance of Palaeontology.
Define the term:
Homologous organs
Industrial melanism was highlighted by ______.
