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Evolution

Question

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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

Ontogeny repeats phylogeny

Solution

D.

Ontogeny repeats phylogeny

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

Some More Questions From Evolution Chapter

What were the units of life according to the early Greek thinkers ?

Mention the type of nutrition in the cells originated first during the origin of life.

Which group of organisms were responsible for appearance of free oxygen in the atmosphere of the primitive earth ?

What is meant by the term fossil ?

What is the type of evolution in which the same structure developed along different directions due to adaptations to different needs ?

Name the different eras of geologic time scale.

What is single step large mutation?

Consider a thorn in Bougainvillea and a tendril in cucurbita. Are these two organs homologous or analogous ? Give reason.

Give two examples that represent adaptive radiation.

Which theory attempts to explain to us the origin of universe?

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