Biology - Chapter 1: The Living World
NCERT Class 11 Biology Solutions (Updated for 2025-26)
1. Key Concepts & Definitions
| Biodiversity: | The variety and variability of living organisms on Earth. |
| Nomenclature: | The scientific system of naming organisms. |
| Taxonomy: | The science of identification, classification, and naming of organisms. |
| Metabolism: | The sum of all chemical reactions occurring within a living organism. |
Taxonomic Hierarchy:
- Kingdom
- Phylum / Division
- Class
- Order
- Family
- Genus
- Species
2. Important Questions & Answers
Q1. What are the defining features of living organisms?
Answer:
1. Growth: Increase in size and number.
2. Reproduction: Ability to produce offspring.
3. Metabolism: All chemical reactions occurring in the body.
4. Consciousness: Ability to respond to environmental stimuli.
1. Growth: Increase in size and number.
2. Reproduction: Ability to produce offspring.
3. Metabolism: All chemical reactions occurring in the body.
4. Consciousness: Ability to respond to environmental stimuli.
Q2. What is Binomial Nomenclature?
Answer: It is a system introduced by Carolus Linnaeus in which every organism is given two names:
Genus and Species.
Example: Mangifera indica
Genus and Species.
Example: Mangifera indica
Q3. What is a Herbarium?
Answer: A herbarium is a collection of dried and preserved plant specimens stored for study and reference.
Q4. What is a Taxonomic Key?
Answer: A taxonomic key is a tool used to identify organisms based on contrasting characteristics.
Q5. What are the rules for writing scientific names?
Answer:
1. Names should be in Latin.
2. Genus name starts with a capital letter.
3. Species name starts with a small letter.
4. Both names should be italicized.
1. Names should be in Latin.
2. Genus name starts with a capital letter.
3. Species name starts with a small letter.
4. Both names should be italicized.
Q6. What is the correct order of taxonomic hierarchy?
Answer: Kingdom → Phylum → Class → Order → Family → Genus → Species
Q7. What is a Species?
Answer: Species is the basic unit of classification. It includes organisms that can interbreed and produce fertile offspring.
Q8. What is a Taxon?
Answer: A taxon is any level of classification such as species, genus, family, etc.
Q9. Explain Taxonomic Categories.
Answer: Taxonomic categories are hierarchical levels in classification. As we move upward, similarities decrease.
Q10. Difference between Zoological Park and Botanical Garden?
- Zoological Park: Conserves and studies animals.
- Botanical Garden: Conserves and studies plant species.
Q11. Importance of Museum in Taxonomy?
Answer: Museums preserve plant and animal specimens for study, research, and education purposes.