Classification and Evolution Questions in English

(N/A) primitive organism is one that possesses a simple body structure and an ancient body design or features that have not changed significantly over a long period of time.
In terms of body design,primitive organisms are characterized by simple structures,whereas so-called advanced organisms possess complex body structures and higher levels of biological organization.

(A) Yes,advanced organisms are generally considered complex organisms.
Evolutionary history shows that life progressed from simple,primitive forms to more complex,advanced forms.
Advanced organisms have acquired their complexity over a long period of evolutionary time.
This complexity allows them to adapt better,compete,and survive in changing environments.

(B) The book 'On the Origin of Species' was written by Charles Darwin. It was published on $24$ November $1859$ and is considered to be the foundation of evolutionary biology. In this work,Darwin introduced the scientific theory that populations evolve over the course of generations through a process of natural selection.

(C) The $Mango$ $tree$ is the most complex and evolved organism among the three.
$1$. $Mango$ $tree$ ($Mangifera$ $indica$) is a multicellular,eukaryotic,autotrophic plant with a well-developed vascular system,complex tissue organization,and seeds enclosed within fruits (Angiosperm).
$2$. $Bacteria$ are unicellular,prokaryotic organisms with a very simple cellular structure and lack membrane-bound organelles.
$3$. $Mushrooms$ (Fungi) are heterotrophic,eukaryotic organisms,but they lack complex tissue systems and vascular tissues,and they do not produce seeds or fruits.

(N/A) According to Charles Darwin, evolution is the process by which life forms arise through the accumulation of changes in body design over generations, which help the organisms possessing these changes to survive and adapt better to their environment.

(N/A) Evolution is defined as the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth. It involves gradual changes in the genetic composition of a population over successive generations,often driven by natural selection and adaptation to the environment.

(N/A) The work done by earlier scientists or their theories is useful even for students of this generation for the following reasons:
$(i)$ The basic need for classifying organisms is to bring about order and organization in the study of biodiversity.
$(ii)$ Classification helps in understanding the evolutionary relationships between different organisms.
$(iii)$ Classification has predictive value. By placing an organism in a specific category based on its external morphology,we can predict its internal structure and characteristics based on the established knowledge of that group.

(N/A) $(i)$ When different forms of organisms are studied,it reflects that life has evolved during the course of evolution,and classification deals with grouping these organisms into groups and subgroups based on their similarities and differences.
$(ii)$ The more characteristics any two species have in common,the more closely they are related. This suggests that they will have a more recent ancestor (and vice-versa).
$(iii)$ Classification helps in tracing the evolutionary relationships between organisms.
Justification: Some groups of organisms have ancient body designs that have not changed much,whereas other groups have acquired their particular body designs relatively recently. Those in the first group are referred to as $primitive$,while those in the second group are $advanced$ organisms. Therefore,complexity in design increases over evolutionary time. Older organisms are simpler,while younger organisms are more complex. For example,the $forearm$ of a human and the $foreleg$ of a horse are $homologous$ structures; they share a common ancestral origin and fundamental plan,even though they perform different functions.

(A) The book titled 'On the Origin of Species' was published in $1859$ by the British naturalist Charles Darwin. This seminal work is considered the foundation of evolutionary biology,introducing the scientific theory that populations evolve over generations through a process of natural selection.