The primary sector involves activities that:

produce goods directly from nature

Which of these belongs to the secondary sector?

Manufacturing cloth from cotton in a factory

What is the difference between reticulate and parallel venation?

Reticulate venation is a net-like pattern of veins, as in hibiscus, while in parallel venation the veins run parallel, as in banana and grass leaves.

What is the difference between a taproot and a fibrous root?

A taproot has one main root with smaller side roots arising from it, as in mustard, while fibrous roots are a bunch of similar thin roots from the base of the stem, as in grass.

What link does the chapter draw between venation, roots, and cotyledons?

Dicot plants generally have reticulate venation and a taproot system, while monocot plants have parallel venation and a fibrous root system.

What is an adaptation? Give an example.

An adaptation is a special feature that enables a plant or animal to survive in a particular region, such as a cactus storing water in its thick fleshy stem to survive the desert.

How are camels of the hot and cold deserts different?

The hot-desert camel has long legs, wide hooves, and one hump, while the cold-desert camel has shorter legs, two humps, and long hair to survive Ladakh's cold winters.

What is a habitat, and what are its two broad types?

A habitat is the place where a plant or animal lives; the two broad types are terrestrial (land) habitats and aquatic (water) habitats.

Amphibians are animals such as frogs that can live both in water and on land.

How can the loss of biodiversity be prevented?

By protecting habitats and through conservation measures such as sacred groves and government projects like Project Tiger and the Cheetah Reintroduction Project.

Diversity in the Living World

Q: What is biodiversity?

Biodiversity is the variety of plants and animals found in a particular region.

Q: How are plants grouped on the basis of their stems and height?

Plants are grouped as herbs (small, soft green stems), shrubs (hard woody stems branching near the ground), and trees (tall, thick, woody stems); climbers and creepers are further types.

Class 6 Science · Curiosity · Chapter 2

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Summary

Through a nature walk led by a scientist and a knowledgeable elder, this chapter introduces the enormous variety of plants and animals around us, called biodiversity, and shows how this variety can be studied by grouping living things based on their similarities and differences. Plants are grouped by the nature of their stems and height into herbs (small, soft, green stems), shrubs (hard woody stems branching near the ground), and trees (tall, thick, woody stems), with climbers and creepers as further types. Leaves are grouped by their pattern of veins, or venation: reticulate (net-like, as in hibiscus) and parallel (as in banana and grass). Roots are grouped as taproots (one main root with side roots, as in mustard) and fibrous roots (a bunch of similar thin roots, as in grass). Seeds with two cotyledons are dicotyledons (dicots) and those with one are monocotyledons (monocots). The chapter reveals an important link: dicots generally have reticulate venation and taproots, while monocots have parallel venation and fibrous roots. Animals are grouped by features such as how they move and the body parts they use. The chapter then explains that biodiversity varies from region to region because of different conditions, and that the special features helping plants and animals survive in a particular place are called adaptations — such as the cactus storing water in fleshy stems, the deodar shedding snow with sloping branches, and camels of hot and cold deserts differing in legs, humps, and hair. The place where a plant or animal lives is its habitat, which may be terrestrial or aquatic, with amphibians like frogs living in both. Finally, it stresses that damage to habitats causes loss of biodiversity, and highlights conservation efforts such as sacred groves and Project Tiger.

Diversity and biodiversityGrouping plants (herbs, shrubs, trees)Venation, roots, and cotyledonsGrouping animals by movementAdaptations, habitats, and conservation

Key terms

Biodiversity

The variety of plants and animals found in a particular region.

Venation

The pattern of veins on a leaf; reticulate venation is net-like (hibiscus) and parallel venation has veins running parallel (banana, grass).

Taproot and fibrous root

A taproot has one main root with smaller side roots (mustard); fibrous roots are a bunch of similar thin roots from the stem base (grass).

Dicots and monocots

Plants whose seeds have two cotyledons are dicotyledons; those with one cotyledon are monocotyledons.

Adaptation

A special feature that enables a plant or animal to survive in a particular region or habitat.

Habitat

The place where a plant or animal lives, which provides food, water, air, and shelter; habitats may be terrestrial or aquatic.

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What is biodiversity?

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