The Living World

The Living World

It is a known fact to everyone that our living world comprises of different kinds of living beings, individuals and assigned groups of species (taxa). The building blocks of the living world are known by the name Cells that are the living units in the minute form. They have the capacity to alter their appearance and structure with the assistance of carbon based and similar compounds (during metabolism) for growth and reproductive activities.

The present day life forms have evolved to the present level from the primitive ones through natural selection and hereditary validation over the generations. With certain fossils dated around 3.5 to 3.7 billion years ago, it could be stated that the studies stating that life began on this planet as early as 4.1 billion years ago could not be true entirely.

Below are certain characteristics of living organisms in the world that we see around us:

 

Reproduction

The organisms have the natural tendencies to grow and reproduce to form new offsprings. This could happen through sexual reproduction involving two organisms and asexual reproduction where one organism produces the other one. The newly reproduced organism will contain the same DNA composition of the parent organism.

 

Growth and Adaptation

The living organisms are bound to grow and adapt to their surroundings. Growth happens through the growth in the molecule numbers. To survive in the new environment, the organisms would have to adapt to their surroundings. For instance, seeds would sprout to full stems as they grow into full grown plants. The adaptation of these plants happen, when they adjust to the lack of water, soil nutrient availability and pH level of water thereby achieving their growth and adaptability ends.

 

Homeostasis

In the world of living organisms, the living beings have to maintain and control their internal states by the way of homeostasis. This would involve adjusting the internal pH level, temperature and water level. For instance, the human body would adjust to the changes in the external weather by wearing a sweater or remove the clothing layers in the body so as to adjust their body temperature.

 

Respiration

All the living organisms have certain ways of respiration. During this process, the energy is released from the organism once the nutrition and food are broken down so as to assist in the growth, adapt and reproduction processes. In short, this is one of the basic processes without which no living organism could survive.

From the above discussion, we could state beyond doubt that the living world around us undergoes drastic changes due to the processes mentioned above. To know more about this concept, visit Byju’s.


Practise This Question

Which one of the following nutrient is needed for protecting our body against diseases?