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CBSE Class 6 Science Chapter 2 – Diversity in the Living World Notes
The world around us is full of living organisms, such as plants, animals, and microorganisms. These living things differ in size, shape, habitat, and other features. Some live on land, while others thrive in water. This variety of living organisms is called diversity. Class 6 Science Notes help students understand the diversity of living organisms, their unique characteristics, and how they are grouped based on their similarities and differences. They also learn that all living organisms have certain basic characteristics, including growth, movement, reproduction, and response to their surroundings.
Diversity in the Living World chapter encourages students to observe living things around them and understand their importance. CBSE Notes Class 6 Science - Chapter 1, Diversity in the Living World PDF Added Above helps students revise the main characteristics of living organisms and the different ways they are grouped. It also makes it easier to recall examples of plants, animals, and microorganisms during revision.
1.0Diversity in the Living World Class 6 Science Chapter 2 - Revision Notes
Diversity in the living world covers how plants and animals (biodiversity) are grouped by physical traits like roots, leaves, and seeds. It also highlights how special adaptations help species survive and depend on each other in diverse habitats.
Key Concepts
- Biodiversity: The variety of plants, animals, and other life in a particular area.
- Grouping: How living things are sorted into groups based on common features.
- Interdependence: How living things rely on one another. For instance, trees give food and shelter to birds. Some animals help plants spread their seeds.
- Habitat: The place where an organism lives and that supplies the things the organism needs to survive.
- Adaptation: A body part or behaviour that helps an organism survive in its environment. Important Topics
1. Types of Plants
Plants differ in height, stem structure, and how they grow. We can classify them into the following types based on these features.
Herbs: Small green-stemmed plants like mint, coriander, and wheat.
Shrubs: Medium-sized plants having stems that are firm stems and branching near the base. Examples: rose, hibiscus, lemon.
Trees: Tall plants with thick and hard stems called trunks, such as neem, mango, peepal, etc.
Climbers: Plants with weak stems that need support to grow up, e.g., grapevines.
Creepers: Plants with weak stems that grow along the ground, like pumpkins.
2. Roots and Leaf Venation
A plant has two main parts: the root system, usually below the ground, and the shoot system, which includes the stem, leaves, flowers, and fruits.
There are two common types of root systems:
- Taproot: One main root grows downwards, with smaller roots branching out from it. Examples include chickpea, mustard, carrot, and radish.
- Fibrous roots: A cluster of thin roots of similar size grows from the base of the stem. Examples include wheat, rice, maize, and grass.
Leaves also have different vein patterns, known as venation.
- Reticulate venation: The veins form a net-like pattern, as seen in many plants with taproots.
- Parallel venation: The veins run parallel to one another, as seen in many plants with fibrous roots.
These features often occur together, making them useful for identifying plants. However, they are general patterns rather than rules that apply to every plant.
Phyllotaxy refers to the arrangement of leaves on a plant’s stem or branches.
3. Monocot and Dicot Seeds
When a seed gets suitable moisture and warmth, it can germinate and grow into a seedling. The radicle develops into the root, while the plumule develops into the shoot.
Seeds can be grouped by the number of cotyledons they contain.
- Monocots: Seeds with one cotyledon, such as maize, wheat, and rice.
- Dicots: Seeds with two cotyledons, such as chickpeas and peas.
In many common plants, monocots have fibrous roots and parallel leaf venation, while dicots have taproots and reticulate venation.
4. Habitats and Adaptations
Habitat: The environment in which an organism lives. Habitats are usually divided into land (terrestrial) and water (aquatic) habitats. Some animals, like frogs, can live on land and in water.
Living organisms have features that help them survive in their habitats.
Desert plants
- Cactus: Its thick, fleshy stem stores water, while its leaves are reduced to spines, helping limit water loss.
- Khejadi tree: It grows in dry regions and provides useful resources such as edible beans and wood.
Desert animals
Camels have features that help them live in dry or cold desert environments.
- Hot-desert camels, such as those found in Rajasthan, have long legs and wide feet suited to walking on sand. Their hump stores fat.
- Cold-desert Bactrian camels, found in Ladakh, have two humps and thick, shaggy hair that helps keep them warm.
Mountain plants
- Deodar trees are cone-shaped with sloping branches so that the snow slides off.
- Rhododendrons are of various heights according to their surroundings. Some grow shorter in the Nilgiris, and some grow taller in Sikkim.
Aquatic animals
Fish have streamlined bodies that help them move through water. Their fins help them steer and maintain balance.
5. Protecting Biodiversity
Plants, animals, and their habitats need protection to maintain biodiversity. Communities and conservationists have taken several steps to protect nature.
- Sacred groves: Forest patches protected by local communities because of religious and cultural traditions. These areas help preserve plants and animals.
- Save Silent Valley Movement: A campaign in Kerala to protect Silent Valley’s evergreen forest from a proposed hydroelectric project on the Kunthipuzha River.
- Janaki Ammal: An Indian botanist who contributed to the study of India’s plant diversity and supported Silent Valley's protection.
- Salim Ali: Known as the Birdman of India, he made important contributions to bird research and conservation.
- Wildlife protection projects: Initiatives such as Project Tiger, launched in 1973, aim to protect threatened wildlife and their habitats.
2.0Terminologies to know - Diversity in the Living World
- Biodiversity: The variety of living organisms in a region.
- Habitat: The natural surroundings in which an organism lives.
- Adaptation: A feature or behaviour that helps an organism survive.
- Phyllotaxy: The arrangement of leaves on a stem.
- Midrib: The main central vein of a leaf.
- Venation: The arrangement of veins in a leaf.
- Taproot: A root system with one main root and smaller branches.
- Fibrous roots: A group of thin roots of similar size.
- Cotyledon: The seed leaf that provides or helps supply nourishment during early growth.
- Sacred groves: Forest patches protected by communities through cultural or religious traditions.
3.0Learning Guide for Class 6 Science Diversity in the Living World - Chapter 2
Practical activity
Collect a few fallen leaves from your surroundings. Observe their veins and identify whether the pattern is net-like or parallel. Avoid plucking leaves unnecessarily.
Diagrams to practise
- Draw and label a taproot and a fibrous root system.
- Show the difference between reticulate and parallel venation.
- Label the radicle and plumule in a germinating seed.
Daily-life examples
Chickpeas and peas are familiar examples of dicot seeds, while rice, wheat, and maize are examples of monocot seeds. You can also observe how cactus plants and fish have features suited to their habitats.
Revision tip
Remember the common pattern:
*Monocot: one cotyledon, usually fibrous roots and parallel venation.
* Dicot: two cotyledons, usually a taproot and reticulate venation.
These are typical patterns, not rules without exceptions.
Safety
Do not eat any strange seed, berry or plant. Don't touch strange insects or animals, and wash your hands after handling soil.
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7.0Key Features of CBSE Class 6 Science Notes Chapter 2 : Diversity in the Living World
- Conceptual Foundations: Explains the core principles of "Life" and provides a base for future biology studies.
- Inquiry-Based Learning: Shifts focus from memorizing names to asking "Why" and "How" organisms survive.
- Process Breakdowns: Simplifies complex life functions like Reproduction and Response to Stimuli into logical steps.
- Visual Learning Aids: Uses high-quality diagrams to make abstract concepts like "habitats" easy to visualize.
- Competency-Based Practice: Features new-pattern questions, including case studies and observation-based MCQs.
- Scientific Temper: Develops skills in keen observation and logical reasoning through nature-based inquiry.
- Interactive Activities: Highlights simple "Try it Yourself" home projects like seed germination or observing bread mold.