PW Class 6 Science Notes Chapter 2: Diversity in the Living World

The living world is full of different plants and animals, and understanding this variety can become easier when you know how organisms are grouped and where they live. Different plants have different structures, while animals can be grouped based on their features and modes of movement. Their surroundings also influence the traits they develop to survive.

Physics Wallah Class 6 Science Notes bring the main ideas from Diversity in the Living World together for revision. You can use these notes to revisit biodiversity, the classification of plants and animals, different habitats, adaptations, and the importance of protecting the living world.

Diversity in the Living World: Biodiversity

The rich variety of plants and animals in a specific region contributes to its biodiversity. Different regions can have different levels of biodiversity because their environmental conditions are unique.

The variety of living organisms in an area makes biodiversity an important part of the living world.

How Are Plants and Animals Classified?

Plants and animals can be classified by observing their similarities and differences. This process helps organise organisms into groups based on their common features.

Grouping Plants by Their Structure

Plants have characteristics related to their roots, stems, leaves, flowers, and more, which can be compared to classify them.

Based on height, stem type, and branching patterns, plants can be grouped as:

• Herbs

• Shrubs

• Trees

Classification Based on Cotyledons

Plants can also be divided according to the number of cotyledons in their seeds.

1. Monocots

Monocots usually have:

• Parallel leaf venation

• Fibrous roots

2. Dicots

Dicots typically have:

• Reticulate venation

• Taproots

Grouping Animals by Movement

Animals can also be grouped according to their modes of movement.

Why Does Biodiversity Differ Across Regions?

The biodiversity of different regions varies because each region has its own environmental conditions.

For example, rhododendron flowering plants found on mountain tops have shorter heights and smaller leaves, which help them withstand strong winds.

The specific traits that help plants and animals adapt to their surroundings are called adaptations.

Where Do Living Organisms Live?

A habitat is the environment in which an organism lives. Based on their habitats, organisms can be classified into terrestrial and aquatic groups.

Terrestrial Habitats

Terrestrial habitats are land-based environments where plants and animals live.

Examples include:

• Forests

• Deserts

• Grasslands

• Mountains

Aquatic Habitats

Aquatic habitats are water-based environments where plants and animals live.

Examples include:

• Ponds

• Lakes

• Rivers

• Oceans

Amphibians

Some organisms can live in both land and water. These are called amphibians.

Example: Frogs

What Happens When Habitats Are Lost?

Habitat destruction can take away the homes, food, and resources that plants and animals need. This can result in a decrease in biodiversity.

Protecting biodiversity is important for maintaining a vibrant planet where plants and animals can survive and thrive.

What Are the Key Ideas in Diversity in the Living World?

The chapter brings together several important ideas about the variety of living organisms and their surroundings.

• Biodiversity refers to the rich variety of plants and animals in a specific region.

• Plants and animals can be classified according to their similarities, differences, and common features.

• Plants can be grouped by structure and by the number of cotyledons in their seeds.

• Monocots usually have parallel leaf venation and fibrous roots, while dicots typically have reticulate venation and taproots.

• Animals can also be grouped according to their modes of movement.

• Different environmental conditions lead to regional differences in biodiversity.

• Adaptations are traits that help organisms adjust to their surroundings.

• Habitats can be terrestrial or aquatic.

• Amphibians can live in both land and water.

• Habitat destruction can reduce biodiversity, making protection important for the survival of plants and animals.

CBSE Class 6 Science Chapter 2 Notes PDF

Use the Physics Wallah notes alongside your textbook to revise the important concepts from Diversity in the Living World.

Why Choose Physics Wallah Notes for Diversity in the Living World?

Physics Wallah notes focus on the chapter-specific concepts that you need to recall while revising.

• Biodiversity: Revisit what biodiversity means and why it differs across regions.

• Plant classification: Quickly recall grouping by structure, cotyledons, leaf venation, and roots.

• Animal classification: Revise the grouping of animals according to their modes of movement.

• Habitat concepts: Review terrestrial, aquatic, and amphibian groups with their examples.

• Adaptations: Recall how specific traits help plants and animals adapt to their surroundings.

• Habitat protection: Revisit how habitat destruction affects homes, food, resources, and biodiversity.

The living world is made up of a wide variety of plants and animals, each grouped according to common features and found in different habitats. Their surroundings can shape the adaptations they develop, while changes to those habitats can affect biodiversity. Revising classification, habitats, adaptations, and protection together can help you understand the main ideas of the chapter more clearly.

The living world is made up of a wide variety of plants and animals, each grouped according to common features and found in different habitats. Their surroundings can shape the adaptations they develop, while changes to those habitats can affect biodiversity. Revising classification, habitats, adaptations, and protection together can help you understand the main ideas of the chapter more clearly.