🌍 1. What is a Habitat?
Every living organism (plant or animal) lives in a specific place that provides it with food, water, shelter,
and other conditions needed to survive and reproduce. This natural home/environment of an organism is called
its habitat.
Habitat = the place where an organism LIVES naturally
- A fish lives in water → its habitat is the aquatic (water) habitat
- A camel lives in the desert → its habitat is the desert habitat
- A polar bear lives in Arctic snowfields → its habitat is the polar habitat
- A squirrel lives in forests → its habitat is the terrestrial (land) habitat
🌿 2. Components of a Habitat — Biotic and Abiotic
A habitat is made up of two types of components:
| Type |
What it means |
Examples |
| Biotic Components |
All living things in the habitat — plants, animals, microorganisms |
Trees, grass, deer, bacteria, earthworms, birds |
| Abiotic Components |
All non-living things in the habitat — physical and chemical factors |
Soil, water, air, sunlight, temperature, wind, rocks, minerals |
Biotic = Biology = Living things
Abiotic = Absent of life = Non-living things
🏔️ 3. Major Types of Habitats
Habitats on Earth are broadly classified into two groups:
A. Terrestrial Habitats (Land)
- Forests: Dense trees, high rainfall, many animals and birds
- Grasslands: Open areas with grass; antelopes, lions, elephants
- Deserts: Very little rainfall, extreme heat by day and cold at night; camels, cacti
- Mountains: Cold temperatures, snow; yaks, pine trees, rhododendrons
- Polar regions: Extremely cold, icy; polar bears, penguins, walruses
B. Aquatic Habitats (Water)
- Freshwater: Rivers, ponds, lakes — frogs, freshwater fish, water lily, lotus
- Seawater (Marine): Oceans and seas — sharks, whales, dolphins, sea anemones, coral
reef
- Coastal/Estuarine: Where river meets sea (estuaries) — mangrove trees, crabs,
crocodiles
🐪 4. Adaptation — How Organisms Suit Their Habitat
Over thousands of years, organisms develop special features (in body shape, behaviour, internal processes)
that help them survive in their habitat. These special features are called adaptations.
Key Idea: Adaptations are NOT learned — they are inherited features that
have evolved over generations to suit a specific environment.
A. Adaptations in Desert Animals (e.g., Camel)
📸 Image Prompt
An educational illustration of a camel in a desert landscape with labeled
adaptation features: (1) Hump — labeled "Stores fat for energy (NOT water)", (2) Long legs — "Keeps body
far from hot sand", (3) Large, padded feet — "Prevents sinking in sand, distributes weight", (4) Long
eyelashes — "Protect eyes from sand/dust", (5) Nostrils can close — "Keep out sand during sandstorm",
(6) Thick lips — "Can eat thorny desert plants". Bright desert background with dunes, clear educational
labels with arrows, semi-realistic illustration style.
Fig. 9.1 — Camel's adaptations to the desert habitat
| Desert Organism |
Adaptation |
How it helps |
| Camel |
Hump stores fat |
Fat converts to energy and water when food/water are scarce |
| Camel |
Can go without water for weeks; urine very concentrated |
Minimizes water loss from the body |
| Cactus |
Leaves reduced to spines; thick fleshy stem stores water |
Reduces water loss; stores water for use; spines protect from animals |
| Desert lizard |
Light-coloured body; active at dawn/dusk |
Reflects heat; avoids extreme midday heat |
B. Adaptations in Aquatic Animals (e.g., Fish)
| Animal |
Adaptation |
Purpose |
| Fish |
Streamlined (torpedo) body shape |
Reduces water resistance for easy swimming |
| Fish |
Gills |
Extract dissolved oxygen from water for breathing |
| Fish |
Slippery scales + slimy mucus |
Reduces friction in water |
| Whale/Dolphin |
Flippers + strong tail fluke |
Steering and propulsion in water |
| Duck |
Webbed feet (flaps of skin between toes) |
Acts like paddles to push water → swim efficiently |
C. Adaptations in Mountain Animals (e.g., Snow Leopard, Yak)
- Thick fur/hair: Traps body heat, acts as insulation against the extreme cold
- Yak's large lungs: At high altitudes, oxygen is less — large lungs take in more air
per breath
- Wide hooves of Snow leopard: Work like snowshoes to walk on snow without sinking
- Pine trees (conifers): Needle-shaped leaves — reduce water loss and snow doesn't
pile up on thin needles
- Sloping/conical shape of mountain trees: Snow slides off easily, preventing branch
breakage
🌱 5. Characteristics of Living Organisms
What makes something "living"? Living things share certain features that non-living things do not have:
🍽️
Nutrition (Food intake): All living things need food for energy and growth. Plants
make their own food (autotrophs); animals eat other organisms (heterotrophs).
🌬️
Respiration: All living things break down food to release energy. They breathe in
oxygen (or use dissolved O₂) and release carbon dioxide.
🏃
Movement: All living things can move at least some parts. Animals move their whole
body; plants move their leaves and roots (though slowly).
📈
Growth: All living things grow — they increase in size and complexity over their
lifetime.
🔥
Response to stimuli: Living things respond to changes in their environment. A plant
turns toward light (phototropism); animals run away from danger.
👶
Reproduction: Living things produce offspring (babies/seeds) to continue their
species.
⏱️
Lifespan and Death: All living things have a fixed lifespan — they eventually die.
🗑️
Excretion: Living things remove waste products from their body (animals: urine, sweat;
plants: release CO₂ at night, oxygen in the day).
📝 6. Quick Revision
- Habitat = natural home of an organism (provides food, water, shelter)
- Biotic = living components (plants, animals). Abiotic = non-living
(water, soil, sunlight, air)
- Adaptations = special features that help survival in a specific habitat (evolved over generations)
- Camel adaptations: Hump (fat store), padded feet, long eyelashes, can close
nostrils
- Cactus: Spiny leaves (reduce water loss), fleshy stem stores water
- Fish: Streamlined body, gills (breathe in water), scales, fins
- Mountain organisms: Thick fur, large lungs, conical tree shape
- Living characteristics: Nutrition, Respiration, Movement, Growth, Response to
stimuli, Reproduction, Excretion
- Plants are autotrophs (make own food); animals are heterotrophs
(eat others)
