Exercise Solutions Available
Step-by-step answers for all textbook questions in this chapter
What is a Habitat?
A habitat is the natural environment where an organism lives, grows, and reproduces. It provides everything the organism needs — food, water, shelter, and suitable conditions.
Examples:
- Fish → Pond/river (aquatic habitat)
- Camel → Desert (terrestrial habitat)
- Eagle → Sky and mountains (aerial + terrestrial)
Components of a Habitat
Biotic (Living) Components
All the living things in a habitat. Examples: Plants, animals, microorganisms, fungi.
Abiotic (Non-living) Components
All the non-living things in a habitat. Examples: Soil, water, air, sunlight, temperature, rocks.
What is Adaptation?
Adaptation = special features or behaviours that help organisms survive in their habitat.
Adaptations in Different Habitats
Desert Habitat
Hot, dry, less water.
Camel:
- Hump stores fat (used for energy when food is scarce, not water).
- Long legs keep body away from hot sand.
- Padded feet prevent sinking in sand.
- Can drink large amounts of water at once and survive days without it.
- Nostrils can close to keep sand out.
- Thick skin prevents water loss.
Desert plants (e.g., cactus):
- Leaves modified into spines to reduce water loss.
- Stem stores water and turns green for photosynthesis.
- Deep or spread-out roots to absorb water.
Aquatic Habitat (Water)
Fish:
- Streamlined body to move easily in water.
- Gills to breathe dissolved oxygen in water.
- Fins to swim, balance, and steer.
- Slippery scales for smooth movement.
Aquatic plants (e.g., lotus):
- Long flexible stems that sway with water current without breaking.
- Leaves floating on surface.
- Roots in soil under water.
Mountain (Cold) Habitat
Snow leopard:
- Thick fur for warmth.
- Large padded paws for walking on snow.
Mountain trees (conifers — pine, fir):
- Cone-shaped (conical) to let snow slide off.
- Needle-like leaves to reduce water loss and survive cold.
Characteristics of Living Organisms
All living organisms share these characteristics:
| Characteristic | Description |
|---|---|
| Nutrition | Need food for energy and growth |
| Respiration | Take in oxygen, release carbon dioxide |
| Excretion | Remove waste products from the body |
| Response | React to changes in environment (stimuli) |
| Growth | Increase in size and mass |
| Reproduction | Produce offspring of their own kind |
| Movement | Move — whole body or body parts |
| Lifespan | Have a definite life span; eventually die |
Plants also show all these characteristics — they just do them differently (e.g., movement is slow: bending toward light, roots growing downward).
Habitat vs Niche
At Class 6 level:
- Habitat = where the organism lives (the address).
- The organism's role in the habitat (what it eats, what eats it) is introduced more in higher classes.
Key Vocabulary
| Term | Meaning |
|---|---|
| Habitat | Natural environment of an organism |
| Adaptation | Feature that helps organism survive |
| Biotic | Living components of a habitat |
| Abiotic | Non-living components |
| Stimulus | A change in the environment that an organism responds to |
| Excretion | Removal of waste from body |
| Reproduction | Producing offspring |
Exam Tips
- Biotic vs Abiotic — give 3 examples each.
- Camel's hump stores fat, not water — a very common mistake to avoid.
- Always link adaptation to how it helps in that habitat (e.g., "streamlined body helps fish reduce friction in water").
- List 7 characteristics of living organisms — often worth 3–4 marks.
- Desert cactus adaptations are a popular diagram/description question.