On this page
Chapter 2 of Class 6 science opens with a nature walk and ends with tigers, camels and sacred groves. In between, it teaches one skill: grouping living things by features you can observe. This post covers the groupings the chapter uses, works one example from start to finish, lists the mistakes that cost marks, and gives a short revision routine.
Where is this in the current book?
"Diversity in the Living World" is Chapter 2 of Curiosity, NCERT's Class 6 science book marked Reprint 2026-27. The chapter PDF is free on the NCERT site. It defines biodiversity as the variety of plants and animals found in a region, and says grouping makes them "easier to understand and study".
How do you group plants by height and stem?
The chapter uses three features: height, the stem (green or brown, soft or hard, thin or thick), and where branches start.
Trees are tall with hard, thick, brown, woody stems. Branches start high up, away from the ground. Example: mango.
Shrubs are not as tall. They have many hard, brown stems that branch very close to the ground. Example: rose.
Herbs are small with soft, green stems. Example: tomato.
Plants with weak stems that need support are climbers; plants that spread along the ground are creepers.
What do leaf veins and roots tell you?
The pattern of veins on a leaf is called venation. A net of veins on both sides of a thick middle vein is reticulate venation (hibiscus). Veins running side by side is parallel venation (banana, grass).
Roots come in two types. A taproot is one main root with small side roots (mustard, hibiscus). Fibrous roots are a bunch of thin roots of similar size from the base of the stem (grass).
Seeds give a third clue. A soaked chickpea splits into two parts called cotyledons, so chickpea is a dicot. Maize has a single cotyledon, so it is a monocot. The chapter links the three: dicots generally have reticulate venation and taproots, and monocots generally have parallel venation and fibrous roots. NCERT's Class 11 biology chapter on plant morphology uses the same rule with the same caution, saying dicots "generally" have taproots and "most" monocots have parallel venation. The word "generally" is there for a reason, so keep it in your answers.
Worked example: sort six plants
Plants: wheat, chickpea, mustard, maize, hibiscus, lemongrass. Use the chapter's facts.
Venation. Wheat, maize and lemongrass have parallel venation. Chickpea, mustard and hibiscus have reticulate venation.
Predict roots. Parallel group: fibrous roots. Reticulate group: taproots. The chapter confirms lemongrass and wheat (fibrous) and chickpea, mustard and hibiscus (taproot).
Predict seeds. Parallel group: monocots. Reticulate group: dicots. The chapter confirms maize as a monocot and chickpea as a dicot.
Count. 3 monocots and 3 dicots, so the six plants split evenly, 3 + 3 = 6.
The exam version is the chapter's flowchart question: "Does it have leaves? Does it have reticulate venation?" Each yes or no sends a plant down one branch. Practise writing your own two-question flowchart for five plants in your area.
How does habitat shape a plant or animal?
The place where a living thing lives is its habitat. Land habitats (forests, deserts, grasslands, mountains) are terrestrial; water habitats (ponds, rivers, oceans) are aquatic. Frogs live in both and are called amphibians.
Features that help a living thing survive in its habitat are adaptations. The chapter's examples:
Cactus stores water in thick, fleshy stems in the desert.
Deodar trees are conical with sloping branches, so snow slides off.
Camels of the hot Rajasthan desert have long legs and wide hooves that do not sink in sand, and one hump. Camels of cold Ladakh have shorter legs, two humps and long hair.
Fish have streamlined bodies and fins for swimming.
When habitats are damaged, plants and animals lose food and shelter and biodiversity falls. The chapter mentions Project Tiger, which the National Tiger Conservation Authority says was launched in April 1973 to keep a viable population of tigers in India.
Which mistakes cost marks?
Calling a rose a tree because it is woody. Check where branches start: close to the ground means shrub.
Saying "all" dicots have taproots. Write "generally".
Mixing up venation names. Reticulate means net; parallel means side by side.
Treating adaptation as a choice the animal makes. It is a feature the living thing already has.
Forgetting that frogs fit both habitats.
How should you revise this chapter?
Recall beats re-reading. In one well-known study, students who tested themselves on a passage remembered more a week later than students who read it again.
Day 1: Collect five fallen leaves. Label each as reticulate or parallel and predict its root type.
Day 2: Without the book, write the herb, shrub and tree features. Check and correct.
Day 4: Make a two-question flowchart that sorts eight plants or animals.
Day 7: Explain two adaptations from your own region to someone at home.
If "cotyledon" or "venation" still feels hazy, the Fermi Concept Library covers every concept in physics, chemistry, biology, mathematics and computing, so you can read the idea on its own before going back to the chapter. Next, see how the book separates living from non-living things.
This week, take one walk, list ten plants you pass, and group each as herb, shrub or tree.
