Anitha Dunga : Subject Matter Expert at Edumarz
Solution : Life processes that are essential for maintaining life are nutrition, respiration, excretion, reproduction,and transportation.
Nutrition is the process of taking food, its digestion and absorption processes. There are different types of nutritions. they are
autotrophic nutrition : organisms which can prepare their own food.
eg : plants, they can prepare their food by taking carbon dioxide and sunlight and water from the environment.
Heterotrophic nutrition : organisms which depend on plants or on other organisms for their food are called heterotrophs eg: animals.
Respiration is another life process which is essential for maintaining life.
Some organisms respire through diffusion and some respire through the respiratory system.
For different levels of organization animals have different types of respiratory organs like gills, lungs and some respire through skin by diffusion.
Excretion is another life process. Excretion means removal of waste material from the body that are formed during various processes.
Excretion can be done by diffusion in lower organisms.
In higher organisms for excretion they are different organs like nephrons in higher grade organisms, renal tubules, malpighian tubules etc.
Transportation is the life processes which means transport of blood, oxygen and other important material from one organ to the other organ.
Higher animals have circulatory systems for transport.
Reproduction is a major life process that is required to maintain life.
Reproduction can be done in many ways by fusion, budding, and fragmentation.
In higher animals they have reproductive systems.