Does the occurrence of diversity of animals on earth suggest their diverse ancestry also? Discuss this point in the light of evolution.
The occurrence of diversity of animals on earth does not suggest their diverse ancestry. There are number of types of animals on this earth. On the basis of certain common characters, these animals are grouped into different group and subgroups. For example- On the basis of presence or absence of notochord, all animals are grouped into two groups- Chordata (with notochord) and Non-Chordata (without notochord).
Because of common characters, we draw a conclusion about common ancestry.
Rate this question :
A student weighed some raisins and recorded the weight as 'x'. She then soaked the raisins in distilled water. After about 2 hours she removed the raisins, wiped them dry and weighed again and recorded that as 'y'. The percentage of water absorbed by raisins may be determined using the relationshipScience - Board Papers
A chain of yeast cells forms becauseScience - Board Papers
Bacteria have a simpler body plan when compared with human beings. Does it mean that human beings are more evolved than bacteria? Provide a suitable explanation.NCERT - Science Exemplar
Give reasons why acquired characters are not inherited.NCERT - Science Exemplar
Differentiate between inherited and acquired characters. Give one example for each type.NCERT - Science Exemplar
Evolution has exhibited a greater stability of molecular structure when compared with morphological structures. Comment on the statement and justify your opinion.NCERT - Science Exemplar
What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor?
Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means thatNCERT - Science Exemplar
Select the correct statementNCERT - Science Exemplar
If the fossil of an organism is found in the deeper layers of earth, then we can predict thatNCERT - Science Exemplar