Aves possess t wo pairs of limbs but the forelimbs are modidied ionto

Which one of the following is incorrect for Aves? A Heart is four-chambered and animals are oviparous B The presence of air cavities in bones and the presence of feathers on the body С Digestive tract has additional chambers and animals are homeothermal D The forelimbs are not modified into wings

Millipedes possess 70 to 100 pairs of legs.

Write about the ancestry and evolution of bat, horse and human on the basis of a comparative study of their forelimbs. What are these limbs categorised an?

Asseriton : The basic plan of basic structure such as forelimbs are hind limbs in vertebrates are homologous . Reason : For limbs of vertebrates exhibit similarity with each other and is made up of similar bones such as humerus, radius , ulna, carpels metacarpals and phalanges.

With the help of vien information write your comment on evidence of evolution. Mammals have forelimbs as do birds, reptiles and amphibians. The basic structure of the limbs is similar, though it has been modified to perform different functiions.

Read the given statements and select the correct option . (a) All amphibians have two pairs of limbs (b) All amphibians lack tail .

Forelimbs of cat, lizard used in walking , fore-limbs of whale used in swimming and forelimbs of bats used in flying are an example of :