$I.$ Organs which are different in basic structure and origin but performs similar functions are called analogous organ
$II.$ Organs with different to basic structure and origin but perform similar functions are called homologous organs
$III.$ Homologous organs lead to convergent evolution
$IV.$ Analogous organ leads to divergent evolution
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Homologous Organs The organs which have the same fundamental structure but are different in functions are called homologous orangs. These organs follows the same basic plan of organization during development. But in adult condition, these organs are modified to perform different function as an adaptation to the different environment. Homologous organs are the resultant of divergent evolution
Implants homologous organs may be a those of Bougainvillea or a tendril of Cucurbita, both arising in the axillary position
Analogous Organs The organs which have similar functions but are different in their details and origin are called analogous organs. The analogous organs shows convergent evolution
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$(I)$. Each neuron has a cell body
$(II)$. Each neuron has a single axon
$(III)$. Neurons are the functional units of nervous system
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