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### *CLASS 11 BIOLOGY - CHAPTER 1: THE LIVING WORLD*
*NEET Quick Revision Notes*
#### *1. WHAT IS LIVING?*
*Characteristics of Living Organisms:*
1. *Growth* - Increase in mass & number of cells. Plants grow throughout life, animals only till
maturity.
2. *Reproduction* - Formation of new individuals. Asexual & Sexual.
- _Exception_: Mules, sterile worker bees, infertile humans don’t reproduce but are still living.
3. *Metabolism* - Sum of all chemical reactions in the body. Both anabolic + catabolic.
4. *Cellular Organization* - All living beings are made of cells.
5. *Consciousness* - Ability to sense and respond to stimuli.
6. *Self-replication & Self-organization*
7. *Homeostasis* - Maintaining internal constant environment.
*Key NEET Point*: Metabolism and Consciousness are defining properties of living organisms.
#### *2. DIVERSITY IN THE LIVING WORLD*
- Millions of organisms present.
- *Need for classification*: To identify and name them.
- *Taxonomy*: Study of principles of classification.
- *Systematics*: Branch dealing with identification, nomenclature and classification.
#### *3. NOMENCLATURE*
*Binomial Nomenclature* - Given by *Carolus Linnaeus*
*Rules:*
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---
### *CLASS 11 BIOLOGY - CHAPTER 1: THE LIVING WORLD*
*NEET Quick Revision Notes*
#### *1. WHAT IS LIVING?*
*Characteristics of Living Organisms:*
1. *Growth* - Increase in mass & number of cells. Plants grow throughout life, animals only till
maturity.
2. *Reproduction* - Formation of new individuals. Asexual & Sexual.
- _Exception_: Mules, sterile worker bees, infertile humans don’t reproduce but are still living.
3. *Metabolism* - Sum of all chemical reactions in the body. Both anabolic + catabolic.
4. *Cellular Organization* - All living beings are made of cells.
5. *Consciousness* - Ability to sense and respond to stimuli.
6. *Self-replication & Self-organization*
7. *Homeostasis* - Maintaining internal constant environment.
*Key NEET Point*: Metabolism and Consciousness are defining properties of living organisms.
#### *2. DIVERSITY IN THE LIVING WORLD*
- Millions of organisms present.
- *Need for classification*: To identify and name them.
- *Taxonomy*: Study of principles of classification.
- *Systematics*: Branch dealing with identification, nomenclature and classification.
#### *3. NOMENCLATURE*
*Binomial Nomenclature* - Given by *Carolus Linnaeus*
*Rules:*
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