All 24 MCQs of 9th Class Biology Chapter 2, Biodiversity, with answers and the reason each option is right or wrong: the 10 textbook exercise MCQs plus 14 more board-style MCQs. Punjab Board new syllabus.
Try each one first: tap an option to check it, then read the reasoning and why the others are wrong.
A note about the questions
The wording follows published solved exercises and every answer was re-checked by hand, so the wording or the order of options may differ slightly from your print.
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Set A: Textbook exercise 10 MCQs
The multiple-choice questions at the end of Chapter 2 in your book, in the book's option order.
Q2.1Classification and Taxonomic Ranks
Which of the following taxonomic ranks represents the broadest rank?
Answer(d) Domain
Step by step
Domain > kingdom > phylum > class > order > family > genus > species.
Why the others are wrong
(a) the lowest rank.
(b) just above species.
(c) below domain.
Remember
Domain is on top (added in 1977).
Q2.2Domains of Life
Which characteristic is unique to organisms in the domain Archaea?
Answer(c) Ability to live in extreme environments
Step by step
Peptidoglycan walls belong to bacteria.
Archaea are prokaryotes: no nucleus.
All cells have ribosomes.
Why the others are wrong
(a) that is bacteria; archaeal walls have no peptidoglycan.
(b) archaea are prokaryotes.
(d) archaea have ribosomes.
Remember
Archaea = extreme lovers.
Q2.3Domains of Life
Which of these statements is NOT related to bacteria?
Answer(d) Have chlorophyll in their chloroplast.
Step by step
No nucleus, peptidoglycan wall, mostly heterotrophic: all true of bacteria.
Why the others are wrong
(a) true of bacteria.
(b) true of bacteria.
(c) true of bacteria.
Remember
Prokaryote = no chloroplast.
Q2.4Domains of Life
Which of these organisms belongs to the domain Eukarya?
Answer(b) Yeast
Step by step
Fungi → kingdom Fungi → domain Eukarya.
Why the others are wrong
(a) a bacterium (domain Bacteria).
(c) viruses are not classified.
(d) yeast fits.
Remember
Yeast has a nucleus.
Q2.5Domains of Life
Which of the following is a key characteristic that distinguishes eukaryotic cells from prokaryotic cells?
Answer(b) Presence of a nucleus
Step by step
Eu = true, karyon = nucleus.
Why the others are wrong
(a) plants and fungi (eukaryotes) have walls.
(c) both have ribosomes.
(d) eukaryotic cells are larger.
Remember
Eukaryote = true nucleus.
Q2.6Kingdoms of Eukarya
Which kingdom includes organisms that are primarily unicellular, eukaryotic, and often heterotrophic?
Answer(b) Protista
Step by step
Archaea are prokaryotes; fungi are mostly multicellular; plants are multicellular autotrophs.
Why the others are wrong
(a) prokaryotes.
(c) mostly multicellular.
(d) multicellular autotrophs.
Remember
Protista = mostly single-celled eukaryotes.
Q2.7Kingdoms of Eukarya
Why are fungi included in heterotrophic organisms?
Answer(d) Cannot prepare food
Step by step
Heterotroph = cannot make food.
Absorption is how fungi feed.
Why the others are wrong
(a) a wall feature, not about food.
(b) HOW they feed, not why they are heterotrophs.
(c) reproduction.
Remember
Hetero = depends on others for food.
Q2.8Status of Viruses
Why is it impossible to classify viruses within traditional biological kingdoms?
Answer(a) They lack cellular structure and organelles.
Step by step
Many organisms are parasites or non-photosynthetic and are still classified.
Why the others are wrong
(b) animals cannot either.
(c) size is not the reason.
(d) many classified organisms are parasites.
Remember
No cell → no kingdom.
Q2.9Binomial Nomenclature
Which of the following is the correct way for writing the scientific name of humans?
Answer(a) Homo sapiens (in italics)
Step by step
Homo (capital H) + sapiens (small s), italic.
Why the others are wrong
(b) a printed scientific name must be in italics.
(c) species name starts with a small letter.
(d) genus name starts with a capital letter.
Remember
Capital genus, small species, italic.
Q2.10Binomial Nomenclature
Which information can you get if you know the scientific name of an organism?
Answer(c) Genus and species
Step by step
Homo sapiens: genus Homo, species sapiens.
Why the others are wrong
(a) Wrong.
(b) Wrong.
(d) Wrong.
Remember
Binomial = two names: genus + species.
Set B: More MCQs from this chapter 14 MCQs
Extra questions on the same ideas, of the kind set in board papers and class tests.
QB1Biodiversity
Biodiversity means:
Answer(c) the variety of organisms in a particular area
Step by step
Bio = life, diversity = variety.
Why the others are wrong
(a) palaeontology.
(b) Wrong.
(d) Wrong.
Remember
Variety of life.
QB2Biodiversity
Which regions have more biodiversity?
Answer(a) Tropical regions
Step by step
Warmth and rain support more kinds of life.
Why the others are wrong
(b) less.
(c) dry, less.
(d) very little.
Remember
Tropics teem with life.
QB3Biodiversity
International Biodiversity Day is celebrated on:
Answer(c) 22nd May
Step by step
5 June is World Environment Day; 22 April is Earth Day.
Why the others are wrong
(a) Environment Day.
(b) Earth Day.
(d) World Food Day.
Remember
Biodiversity: 22 May.
QB4Classification and Taxonomic Ranks
The Linnaean system of seven taxonomic ranks was devised in:
Answer(a) 1735
Step by step
1866 Haeckel; 1969 Whittaker; 1977 Woese.
Why the others are wrong
(b) Haeckel's third kingdom.
(c) Whittaker's five kingdoms.
(d) Woese's domains.
Remember
Linnaeus 1735.
QB5Classification and Taxonomic Ranks
A group of similar organisms that can interbreed and produce fertile offspring is a:
Answer(d) species
Step by step
Fertile offspring is the test of one species.
Why the others are wrong
(a) a group of related species.
(b) Wrong.
(c) Wrong.
Remember
Interbreed → same species.
QB6Classification and Taxonomic Ranks
The order to which humans belong is:
Answer(b) Primates
Step by step
Diptera is the order of the fruit fly; Fabales of the pea; Chordata is a phylum.
Why the others are wrong
(a) fruit fly.
(c) pea.
(d) phylum, not order.
Remember
Humans are primates.
QB7History of Classification
Euglena made the two-kingdom system unworkable because it:
Answer(a) has both plant-like and animal-like characteristics
Step by step
Neither plant nor animal fits.
Why the others are wrong
(b) eukaryote.
(c) unicellular.
(d) no cell wall.
Remember
Euglena = half plant, half animal.
QB8History of Classification
The five-kingdom classification system was introduced by:
Answer(d) Robert Whittaker
Step by step
Haeckel 1866 three kingdoms; Woese 1977 domains.
Why the others are wrong
(a) three kingdoms.
(b) three domains.
(c) two groups.
Remember
Whittaker → five.
QB9History of Classification
Who described the characteristics of 350 species of animals and wrote a lot about the life of ants?
Answer(c) Al-Jahiz
Step by step
Ibn Rushd translated Aristotle; Tournefort introduced class and species; Caesalpinio made 15 plant groups.
Why the others are wrong
(a) translated Aristotle's "de Anima".
(b) class and species taxa.
(d) fifteen plant genera.
Remember
Jahiz: 350 animals, ants.
QB10Domains of Life
Archaebacteria that produce methane as a by-product of metabolism are called:
Answer(a) Methanogens
Step by step
Methano-gen = methane-making.
Why the others are wrong
(b) heat.
(c) salt.
(d) acid.
Remember
Name tells the habit.
QB11Kingdoms of Eukarya
The cell wall of fungi is made of:
Answer(b) chitin
Step by step
Chitin is also in the skeleton of insects.
Why the others are wrong
(a) plants and algae.
(c) bacteria.
(d) Wrong.
Remember
Fungi = chitin.
QB12Kingdoms of Eukarya
Which protist causes amoebic dysentery?
Answer(b) Entamoeba
Step by step
Euglena and Paramecium are free-living.
Why the others are wrong
(a) malaria.
(c) free-living alga.
(d) free-living.
Remember
Ent-amoeba → amoebic dysentery.
QB13Kingdoms of Eukarya
The antibiotic penicillin is derived from:
Answer(d) the fungus Penicillium
Step by step
Penicillin from Penicillium (a mould).
Why the others are wrong
(a) Wrong.
(b) Wrong.
(c) Wrong.
Remember
Name gives it away.
QB14Status of Viruses
A virus consists of:
Answer(c) nucleic acid surrounded by a protein coat
