Which one of the following statement is correct?

  • Stem cells are specialize cells

  • There is no evidence of the existence of gills during embryogensis of mammals

  • All plant and animal cells are totipotent

  • All plant and animal cells are totipotent


D.

All plant and animal cells are totipotent

Recapitulation theory or Biogenetic law states that ontogeny (development of embryo) is recapitulation of phylogeny (ancestral sequence)

312 Views

Advertisement

What is common to whale, seal and shark?

  • Seasonal migration

  • Thick subcutaneous fat

  • Convergent evolution

  • Convergent evolution


C.

Convergent evolution

Distantly related animals (as whale, seal and shark) inhabiting similar habitats often develop similarly morphological features that make them look similar. This is termed adaptive convergence or convergent evolution.

505 Views

Advertisement

Adaptive radiation refers to

  • adaptations due to geographical isolation

  • evolution of different species from a common ancestor

  • migration of members of a species to different geographical areas

  • migration of members of a species to different geographical areas


B.

evolution of different species from a common ancestor

Adaptive radiation is the development of different functional structures from a common ancestral form.

391 Views

The finches of Galapagos islands provide an evidence in favour of

  • special creation

  • evolution due to mutation

  • retrogressive evolution

  • retrogressive evolution


D.

retrogressive evolution

Darwin's finches of Galapagos islands had common ancestors lateron whose beaks modified according to their feed habit. These provide evidence of geographical distribution. 

413 Views

When two species of different genealogy come to resemble each other as a result of adaptation, the phenomenon is termed

  • divergent evolution

  • microevolution

  • co-evolution

  • co-evolution


D.

co-evolution

In convergent evolution lineages show similar morphology under the influence of similar environmental factors.

476 Views

Advertisement