Match the terms given in column I with those given in column II :
|Column I||Column II|
|(1) Fossil||(a) A famous evolutionist|
|(2) A theory of evolution||(b) Survival of the fittest|
|(3) Probable ancestor of birds||(c) Petrified remains of prehistoric life|
|(4) Charles Darwin||(d) Father of genetics|
|(5) Gregor Mendel||(e) Archaeopteryx|
Out of the wing of a bird, wing of an insect and the wing of a bat :
(a) which two are homologous organs?
(b) which two are analogous organs?
Give an example of characteristics being used to determine how close two species are in evolutionary terms.
Insects, octopus, planaria and vertebrates possess eyes. Can we group these animals together on the basis of eyes that they possess ? Justify your answer giving reason.
A black mouse mates with a brown mouse, and all the offsprings are black.
(a) Why are no brown offsprings produced?
(b) If two of the black offsprings mate with each other what kind of offspring would you expect and in what proportions? Give reason for your answer.
Some plants occur in one of the two sizes : tall or dwarf. This characteristic is controlled by one pair of genes. Tallness is dominant to dwarfness. Choose suitable letters for this gene pair.
Fill in the following blanks with suitable words :
The human forelimb and bat's forelimb are an example of .......... organs whereas an insect's wing and a bat's wing are an example of ........... organs.