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Class 11 | CBSE | BIOLOGY
CASE BASED QUESTIONS

BIOLOGY CLASS 11 :

NEP-2020 aligned CASE-BASED & COMPETENCY-BASED QUESTIONS WITH ANSWERS

Class 11 Biology – Chapter 1 | 1.2 TAXONOMIC CATEGORIES

(Prepared strictly as per CBSE board pattern, full-mark answers, exam-focused)

CASE-BASED & COMPETENCY-BASED QUESTIONS

1.2 TAXONOMIC CATEGORIES

CASE–BASED QUESTION 1 (5 MARKS)

A biology student observed that lion, tiger and leopard share many common features such as sharp canines, carnivorous habits and similar body structure. However, they are still considered different species. The student further noticed that cats share some similarities with these animals but are placed separately.

(a) Name the taxonomic category that includes lion, tiger and leopard. (1)

Answer: Genus (Panthera)

(b) Why are lion, tiger and leopard considered different species? (2)

Answer:
They are considered different species because:

They show distinct morphological differences
Each has a unique specific epithet (leo, tigris, pardus)

(c) Name the family to which both Panthera and Felis belong. (1)

Answer: Felidae

(d) State one reason why cats are placed in a different genus from lions. (1)

Answer:
Cats have less similarity with lions compared to similarities among lion, tiger and leopard, hence they are placed in a different genus (Felis).

CASE–BASED QUESTION 2 (5 MARKS)

A teacher showed students the classification of mango and wheat. Though both are flowering plants, mango is dicotyledonous while wheat is monocotyledonous.

(a) Name the division to which both mango and wheat belong. (1)

Answer: Angiospermae

(b) Mention the class of mango and wheat respectively. (2)

Answer:

Mango → Dicotyledonae
Wheat → Monocotyledonae

(c) Why are mango and wheat placed in different classes? (2)

Answer:
They are placed in different classes due to differences in:

Number of cotyledons
Leaf venation and root system

CASE–BASED QUESTION 3 (4 MARKS)

During a field study, students found organisms grouped into different ranks such as species, genus, family and order.

(a) What is meant by a taxonomic category? (1)

Answer:
A taxonomic category is a rank or level in the classification hierarchy representing a unit of classification.

(b) Arrange the following in ascending order:

Family, Species, Class, Genus (2)
Answer:
Species → Genus → Family → Class

(c) Which category has the maximum similarities? (1)

Answer: Species

COMPETENCY–BASED QUESTION 1 (3 MARKS)

Assertion (A): Species is considered the basic unit of classification.
Reason (R): Members of a species share maximum similarities.

Answer:
✔ Both A and R are true
✔ R is the correct explanation of A

COMPETENCY–BASED QUESTION 2 (3 MARKS)

A student classified an organism as follows:

Kingdom → Animalia
Phylum → Chordata
Class → Mammalia
Order → Primata

(a) Name one organism that fits this classification. (1)

Answer: Human (Homo sapiens)

(b) Name the family of this organism. (1)

Answer: Hominidae

(c) Write the genus name. (1)

Answer: Homo

CASE–BASED QUESTION 4 (5 MARKS)

While studying classification, a student noticed that similarities decrease as we move from species to kingdom.

(a) Which level has the least similarities? (1)

Answer: Kingdom

(b) Explain why classification becomes complex at higher levels. (2)

Answer:
Classification becomes complex because:

Shared characters are fewer
Organisms show greater diversity

(c) Name two higher taxonomic categories. (2)