It is the property of an organism to give responce against its external stimulus.

Human beings are the only organisms having consciousness and self consciousness, too, so, as there is no exception.

Introduction:
Consciousness is the state of being aware of and able to think and perceive one's surroundings. It is a complex phenomenon that has fascinated scientists, philosophers, and psychologists for centuries. The question of whether consciousness can be considered a defining property of a living organism is a topic of debate and exploration.

Consciousness as a Defining Property:
1. Distinctive Characteristics: Consciousness is often considered a defining property of living organisms due to its distinctive characteristics that differentiate them from non-living entities.
2. Self-Awareness: Living organisms possess the ability to be self-aware, to have subjective experiences, thoughts, and emotions, which are fundamental aspects of consciousness.
3. Perception and Sensation: Consciousness allows living organisms to perceive and sense their environment, enabling them to interact and respond accordingly.
4. Higher Cognitive Functions: Consciousness is closely associated with higher cognitive functions such as memory, attention, reasoning, and problem-solving, which are crucial for survival and adaptation.
5. Complexity and Organization: The presence of consciousness in living organisms reflects their complex and organized biological structures, including the brain and nervous system, which facilitate conscious experiences.
6. Evolutionary Perspective: Consciousness is believed to have evolved gradually, with simpler forms of awareness present in lower organisms and more developed consciousness observed in higher organisms.

Controversies and Alternative Perspectives:
1. Non-Living Entities: Some argue that certain non-living entities, such as advanced AI systems, may exhibit characteristics resembling consciousness, challenging the notion that consciousness is exclusive to living organisms.
2. Defining Boundaries: The definition and understanding of consciousness are still evolving, making it difficult to establish clear boundaries for its presence in living organisms.
3. Minimal Consciousness: The concept of minimal consciousness suggests that even organisms lacking complex cognitive abilities may possess rudimentary forms of consciousness, further blurring the line between living and non-living entities.

Conclusion:
While consciousness is often considered a defining property of living organisms, the concept remains complex and open to interpretation. The presence of self-awareness, perception, higher cognitive functions, and evolutionary perspectives support the argument for consciousness as a defining property. However, controversies regarding non-living entities and the existence of minimal consciousness highlight the ongoing debate surrounding this topic. Further research and exploration are necessary to deepen our understanding of consciousness and its relationship to living organisms.