Biodiversity is the variety of all living organisms on Earth and the complex interactions they share with each other and their environment. It helps us understand how different species coexist, adapt, and contribute to the balance of ecosystems.
In this chapter, we first explore the concept and importance of Biodiversity, then learn about Taxonomic Ranks, which provide a structured way to classify and organize living organisms based on their shared characteristics. We also study the History of Classification to understand how scientists in the past categorized organisms and how modern methods have refined this system.
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These notes include important MCQs, short questions, and detailed answers from Class 9 Biology Chapter 2 – Biodiversity. Perfect for exam preparation and quick revision.
Class 9 Biology Chapter 2 MCQs – Biodiversity
1. Which of the following statements is NOT related to bacteria?
a) Do not have a nucleus
b) Cell wall made of peptidoglycan
c) Most are heterotrophic
d) Have chlorophyll in their chloroplasts
Answer: d) Have chlorophyll in their chloroplasts ✅
2. Which kingdom includes organisms that are eukaryotic, often unicellular, and heterotrophic?
a) Archaea
b) Protista
c) Fungi
d) Plantae
Answer: b) Protista ✅
3. What does the term ‘biodiversity’ refer to?
Options:
a) The number of different organisms in a given area
b) The diversity of species in the oceans
c) The abundance of a single species in an ecosystem
d) The variety of geographical regions
4. International Biodiversity Day is celebrated on which date?
a) May 22nd
b) March 22nd
c) June 5th
d) April 22nd
Answer: a) May 22nd ✅
5. Which taxonomic rank was added to the Linnaean system in 1977?
a) Family
b) Domain
c) Order
d) Kingdom
6. In the Five-Kingdom Classification System, which kingdom includes organisms like bacteria and archaea?a) Protista
b) Monera
c) Fungi
d) Plantae
Answer: b) Monera ✅
7. What is the major difference between Kingdom Protista and Kingdom Fungi?
a) Protists are multicellular while fungi are unicellular
b) Fungi are autotrophs, while protists are heterotrophs
c) Fungi absorb nutrients from decaying matter, while protists ingest food or photosynthesize
d) Protists have chitin in their cell walls, while fungi do not
Answer: c) Fungi absorb nutrients from decaying matter, while protists ingest food or photosynthesize ✅