Class – XI Biology Chapter 1 NCERT Solutions – Q&A

NCERT Class 11 Biology Chapter 1 “The Living World” important questions and answers covering classification of organisms, taxonomical hierarchy, scientific nomenclature, species concept, and taxa. Clear, exam-oriented answers prepared strictly as per the latest NCERT syllabus for CBSE Class XI Biology students.

Question No. 5

Given below is the scientific name of Mango. Identify the correctly written name.

Mangifera Indica
Mangifera indica

Answer: Mangifera indica

Explanation: In scientific nomenclature, the generic name begins with a capital letter, the specific epithet begins with a small letter, and both words are written in italics or underlined separately.

Question No. 7

Can you identify the correct sequence of taxonomical categories?

(a) Species → Order → Phylum → Kingdom
(b) Genus → Species → Order → Kingdom
(c) Species → Genus → Order → Phylum

Answer: (c) Species → Genus → Order → Phylum

Question No. 9

Define the following terms:

(i) Phylum: A group of related classes that share basic structural and organisational similarities.

(ii) Class: A group of related orders having common characteristics.

(iii) Family: A group of related genera with more similarities than differences.

(iv) Order: A group of related families.

(v) Genus: A group of closely related species.

Question No. 10

Illustrate the taxonomical hierarchy with suitable examples of a plant and an animal.

Example 1: Plant (Mango)

Kingdom   : Plantae
  ↓
Division  : Angiospermae
  ↓
Class     : Dicotyledonae
  ↓
Order     : Sapindales
  ↓
Family    : Anacardiaceae
  ↓
Genus     : Mangifera
  ↓
Species   : Mangifera indica

Example 2: Animal (Human)

Kingdom   : Animalia
  ↓
Phylum    : Chordata
  ↓
Class     : Mammalia
  ↓
Order     : Primates
  ↓
Family    : Hominidae
  ↓
Genus     : Homo
  ↓
Species   : Homo sapiens