Class 9 Science · Original EZT practice
Patterns in Life: Diversity and Classification (Class 9 Science Chapter 12): summary and practice
India is one of the world's biodiversity hotspots, and making sense of that variety needs a system. This chapter covers how biodiversity evolved, the criteria used to classify organisms, and Whittaker's five kingdom classification - Monera, Protista, Fungi, Plantae and Animalia. All questions are original EZT tutor practice following the chapter's own section order.
6 original worked examples, 6 fresh self-check questions and 4 mixed questions, with explained answers. These are not copied textbook exercises, an official chapter index or a full answer key. No affiliation with NCERT is claimed.
Official sources for topic and edition context, checked 22 October 2026:
1. India as a biodiversity hotspot
India holds an enormous variety of life forms across its regions, making it a biodiversity hotspot. This diversity evolved over long periods as organisms adapted to different environments.
2. Criteria to classify living organisms
Classification uses observable criteria - whether cells are prokaryotic or eukaryotic, whether organisms are unicellular or multicellular, and how they obtain food (autotrophic or heterotrophic).
3. Whittaker's five kingdom classification
Whittaker's system places all organisms in five kingdoms - Monera (unicellular prokaryotes), Protista (unicellular eukaryotes), Fungi (multicellular heterotrophs that absorb food), Plantae (multicellular autotrophs) and Animalia (multicellular heterotrophs).
Choose, solve, check, then try a fresh question.
Before calculating, read the method prompt and name the condition that makes it useful. Write your own attempt. Open the steps only when you need them, and use the check to catch a wrong sign, unit or interpretation. Finish with the fresh question before reading its answer.
Explain a biodiversity hotspot
Choose the method: Rich variety, many unique species.
EZT practice question
What does it mean to call India a biodiversity hotspot?
Show the worked solution
- Count the variety: India holds an exceptional number of living organisms across its regions.
- Many of these species are found nowhere else.
- Such richness makes the region a priority for studying and conserving biodiversity.
Answer: It means India has an exceptionally rich variety of living organisms - many species, including many found nowhere else - making it a priority region for studying and conserving biodiversity.
Check: The word hotspot signals both richness and uniqueness, not just a large headcount of organisms.
Watch for this: Do not reduce it to 'many animals' - the variety spans all life forms, from microbes to plants to animals.
Now try it yourself
Why is classifying organisms useful?
Check your answer
It groups the huge variety of life by shared features, making organisms easier to study, identify and compare.
A system beats an unsorted list of millions of species.
Explain why biodiversity varies
Choose the method: Different habitats, different life.
EZT practice question
Give one reason biodiversity varies between regions.
Show the worked solution
- Each region offers its own climate and habitats.
- Different conditions favour different organisms.
- Species adapt and diversify differently in each region.
Answer: Different climates and habitats favour different organisms, so species adapt and diversify differently in each region.
Check: The same logic explains why a desert and a rainforest hold very different sets of organisms.
Watch for this: Do not say organisms appear at random - the environment shapes which life forms thrive.
Now try it yourself
Over what timescale did today's biodiversity evolve?
Check your answer
Over very long periods, as organisms adapted to different environments.
Evolution of variety is slow and cumulative.
Name classification criteria
Choose the method: Cells, organisation, nutrition.
EZT practice question
Name two criteria used to classify living organisms.
Show the worked solution
- Look at the cell: prokaryotic (no well-defined nucleus) or eukaryotic (with a nucleus).
- Look at the body: unicellular or multicellular.
- Look at nutrition: autotrophic (makes its own food) or heterotrophic (takes food in).
Answer: Cell type (prokaryotic vs eukaryotic) and body organisation (unicellular vs multicellular); mode of nutrition (autotrophic vs heterotrophic) is another.
Check: All three are observable features, which is what makes them usable criteria.
Watch for this: Do not name habitat as a classification criterion here - the chapter classifies by the organism's own features.
Now try it yourself
What is the difference between prokaryotic and eukaryotic cells?
Check your answer
Prokaryotic cells lack a well-defined nucleus; eukaryotic cells have one.
The nucleus is the dividing line.
Group by the criteria
Choose the method: No nucleus, one cell - think Monera.
EZT practice question
A unicellular organism without a true nucleus would fall into which grouping by these criteria?
Show the worked solution
- Unicellular fixes the body organisation.
- No true nucleus makes the cell prokaryotic.
- The group for unicellular prokaryotes is Kingdom Monera.
Answer: Unicellular prokaryote - Kingdom Monera.
Check: Bacteria fit exactly this description and are the standard Monera example.
Watch for this: Do not place it in Protista - protists are unicellular but eukaryotic, with a true nucleus.
Now try it yourself
Which kingdoms contain only unicellular organisms?
Check your answer
Monera and Protista.
Fungi, Plantae and Animalia are multicellular.
Place organisms in kingdoms
Choose the method: Match the features to the kingdom.
EZT practice question
Place each in a kingdom: (a) bacteria, (b) Amoeba, (c) mushroom.
Show the worked solution
- Bacteria are unicellular prokaryotes - that is Monera.
- Amoeba is unicellular with a true nucleus - that is Protista.
- A mushroom is multicellular and absorbs food - that is Fungi.
Answer: (a) Monera - unicellular prokaryote; (b) Protista - unicellular eukaryote; (c) Fungi - heterotroph that absorbs food.
Check: Run each answer back through the criteria - cell type, organisation, nutrition - and it holds.
Watch for this: Do not call a mushroom a plant - it cannot photosynthesise; it absorbs food like other fungi.
Now try it yourself
How do Fungi and Plantae differ in nutrition?
Check your answer
Plantae are autotrophic - they make food by photosynthesis; Fungi are heterotrophic - they absorb food from their surroundings.
Nutrition is one of the criteria separating the two kingdoms.
Recall the five kingdoms
Choose the method: Monera to Animalia, in order of complexity.
EZT practice question
List Whittaker's five kingdoms with one feature of each.
Show the worked solution
- Monera - unicellular prokaryotes.
- Protista - unicellular eukaryotes.
- Fungi - multicellular heterotrophs that absorb food; Plantae - multicellular autotrophs; Animalia - multicellular heterotrophs.
Answer: Monera (unicellular prokaryotes), Protista (unicellular eukaryotes), Fungi (multicellular heterotrophs that absorb food), Plantae (multicellular autotrophs) and Animalia (multicellular heterotrophs).
Check: The sequence moves from single cells without nuclei to complex multicellular organisms - the criteria build on each other.
Watch for this: Do not drop Protista - it is the eukaryotic counterpart of Monera and easy to forget.
Now try it yourself
To which kingdom does a unicellular organism with a true nucleus belong?
Check your answer
Protista.
Unicellular plus eukaryotic is the Protista combination.
Try a mixed set
Choose a method or explanation before opening each answer.
1. Why is India a biodiversity hotspot?
Show answer and reason
It holds an exceptional variety of species across many habitats.
Many species are found nowhere else.
2. Three classification criteria?
Show answer and reason
Cell type, body organisation and mode of nutrition.
Prokaryotic/eukaryotic, unicellular/multicellular, autotrophic/heterotrophic.
3. Whittaker's five kingdoms?
Show answer and reason
Monera, Protista, Fungi, Plantae and Animalia.
Monera are unicellular prokaryotes; Protista unicellular eukaryotes.
4. Kingdom of bacteria?
Show answer and reason
Monera.
Bacteria are unicellular prokaryotes.
Try it yourself
Work these on paper before checking any notes. Answers are deliberately not shown here.
- Why is classifying organisms useful?
- Which kingdoms contain only unicellular organisms?
- How do Fungi and Plantae differ in nutrition?
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Questions about this practice page
- What are the five kingdoms in Whittaker's classification?
- Monera (unicellular prokaryotes), Protista (unicellular eukaryotes), Fungi, Plantae and Animalia.
- What criteria are used to classify organisms?
- Cell type (prokaryotic/eukaryotic), body organisation (unicellular/multicellular), and mode of nutrition (autotrophic/heterotrophic), among others.
- Why is India called a biodiversity hotspot?
- Because of its exceptional variety of species across many habitats, including species found nowhere else.
- Which kingdom do bacteria belong to?
- Kingdom Monera - unicellular prokaryotes.
- Are these the NCERT exercise questions for Class 9 Science Chapter 12?
- No. EZT pages are original practice following the chapter's section order - use them to prepare for the textbook exercises, not as a substitute for your book.