The Living World: Habitats and Adaptations

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habitat

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amphibians

stems

conical

streamlined

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A–(ii), B–(iii), C–(i), D–(v), E–(iv)

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Habitat is the place where an organism lives and grows naturally, providing food, water, shelter, and favourable climatic conditions. Example: a forest, a pond, or a desert.

Adaptation refers to the special features that plants and animals develop to survive and thrive in their particular habitat. It is important because it enables organisms to obtain food, reproduce, and protect themselves in their surroundings.

Terrestrial habitats are on land (e.g., forests, deserts, grasslands, mountains). Aquatic habitats are in water (e.g., ponds, lakes, rivers, oceans).

Amphibians are animals that can live both on land and in water. Example: frog.

(i) Thick and fleshy stems to store water. (ii) Spines instead of leaves to reduce water loss through transpiration.

(i) Conical shape with flexible and sloping branches that allow snow to slide off easily. (ii) Needle-like leaves to reduce water loss.

Flat fins and tails help fish change direction and maintain balance while swimming in water.

In the Shola Forest of Nilgiris, rhododendrons are shorter with smaller leaves to withstand heavy winds. In Sikkim mountains, they are taller. This shows adaptation to localized conditions like wind, water availability, and climate.

A hot-desert camel (Rajasthan) has a single large hump to store fat for energy. A cold-desert camel (Ladakh) has two humps that shrink in late winter due to food scarcity.

They stay in deep burrows during the daytime to escape the heat and are active at night when it is cooler.

Biodiversity refers to the wide variety of living organisms — plants, animals, and microorganisms — found in a particular region or on Earth as a whole.

Adaptation is a gradual and continuous process over a long period that develops special features in organisms for survival. Acclimatisation refers to small, short-term changes in an organism's body to adjust to changed surroundings, such as breathing faster at high altitudes.

Introduction: Fish are aquatic animals that possess several special features called adaptations which help them survive in water.
Key Points:
1. Streamlined body — The streamlined, spindle-shaped body of a fish reduces water resistance and helps it swim easily.
2. Gills for breathing — Fish have gills that extract dissolved oxygen from water, allowing them to breathe underwater.
3. Fins for movement — Fins and a flattened tail help fish move, change direction, and maintain balance while swimming in water.
Conclusion: These adaptations make fish perfectly suited for life in an aquatic habitat where they can move and breathe efficiently.

Introduction: Camels living in hot deserts like Rajasthan have several adaptations that help them survive extreme heat and scarcity of water.
Key Points:
1. Long legs — Long legs keep the camel's body high above the hot desert sand, reducing contact with the heated ground.
2. Storage of fat in hump — The hump stores fat which the camel uses as a reserve source of energy during food scarcity.
3. Minimal water loss — Camels excrete very little urine and their dung is dry, helping them conserve water in the desert.
Conclusion: These adaptations enable camels to survive comfortably in the harsh conditions of hot deserts with very little water.

Introduction: Camels found in the cold deserts of Ladakh, known as double-humped Bactrian camels, have special adaptations for surviving cold climates.
Key Points:
1. Two humps for fat storage — The two humps store fat reserves that provide energy during harsh winters when food is scarce.
2. Thick fur coat — A thick layer of fur on the body provides insulation against the extreme cold of the desert region.
3. Padded feet — Broad, padded feet help camels walk on rocky terrain and prevent them from slipping on snowy ground.
Conclusion: These features make Bactrian camels well-adapted to survive the freezing temperatures and rugged terrain of cold deserts.

Introduction: Cactus plants grow in hot deserts where water is scarce, and they have developed several adaptations to survive in such dry conditions.
Key Points:
1. Spines instead of leaves — Leaves are modified into spines to reduce water loss through transpiration in the hot desert.
2. Thick, fleshy stem — The thick green stem stores water and also performs photosynthesis to prepare food for the plant.
3. Deep root system — Cactus roots go deep into the soil to absorb whatever water is available in the arid desert environment.
Conclusion: These adaptations allow cactus plants to survive and grow even in the extremely dry and hot conditions of deserts.

Introduction: Deodar trees grow in mountainous regions and have developed specific adaptations to survive the cold and snowy conditions of high altitudes.
Key Points:
1. Cone-shaped body — The cone shape allows snow to slide off easily, preventing branches from breaking under snow weight.
2. Needle-like leaves — Needle-like leaves have a thick waxy coating that reduces water loss and protects against freezing cold.
3. Strong and flexible branches — Sloping branches are strong yet flexible, helping them bear the weight of heavy snowfall without breaking.
Conclusion: These adaptations help deodar trees thrive in mountain habitats where heavy snowfall and freezing temperatures are common.

Introduction: Rhododendrons are plants that show different adaptations depending on the region they grow in, demonstrating how environment shapes features.
Key Points:
1. In mountains (Himalayas) — Rhododendrons in the Himalayas are tall trees with large leaves to capture maximum sunlight in cold regions.
2. In Nilgiris (mountains) — The same species in the Nilgiris shows variations in size and leaf structure suited to that specific climate.
3. Environmental influence — Differences in temperature, rainfall, and altitude cause the same plant species to develop different features in different regions.
Conclusion: Rhododendrons demonstrate that organisms of the same species can develop different adaptations based on their specific habitats.

Introduction: Every habitat consists of two types of components — biotic and abiotic — that together sustain the organisms living there.
Key Points:
1. Biotic components — Biotic components are the living parts of a habitat, such as plants, animals, and microorganisms like bacteria and fungi.
2. Abiotic components — Abiotic components are the non-living parts of a habitat, including soil, water, air, sunlight, and temperature.
3. Interdependence — Living organisms depend on abiotic components like water, air, and sunlight for their survival, growth, and reproduction.
Conclusion: Both biotic and abiotic components are essential as they work together to form a complete and balanced habitat for organisms.

Introduction: Biodiversity refers to the variety of living organisms found in a particular area, and it is vital for maintaining ecological balance.
Key Points:
1. Ecological balance — Biodiversity maintains balance in nature as different organisms depend on each other for food, shelter, and survival.
2. Human benefits — A wide variety of plants and animals provide humans with food, medicines, and raw materials for daily use.
3. Conservation methods — Biodiversity can be conserved by protecting forests, creating national parks and sanctuaries, and avoiding deforestation and pollution.
Conclusion: Conserving biodiversity is essential for the survival of all living beings and for maintaining a healthy, balanced natural environment.

(a) Spines reduce water loss through transpiration, helping the plant conserve water in the dry desert.
(b) Thick, fleshy stems store water for use during periods of scarcity and also perform photosynthesis.
(c) Long legs keep the camel's body away from the heat of the sand. The single hump stores fat that provides energy during food scarcity.

(a) The conical shape prevents snow from accumulating on the tree, preventing damage.
(b) Sloping, flexible branches allow snow to slide off easily during heavy snowfall.
(c) Thick fur provides insulation against the extreme cold of mountain regions, helping animals retain body heat.

(a) In the Nilgiris, rhododendrons are shorter with smaller leaves. In Sikkim, they are taller.
(b) The shorter height and smaller leaves help them withstand heavy winds in the Nilgiri region.
(c) This demonstrates adaptation to localized environmental conditions like water availability, light intensity, and climate.

(a) The streamlined body shape helps the fish move easily and smoothly through water with minimal resistance.
(b) Slippery scales protect the fish and aid in easy movement through water by reducing friction.
(c) Flat fins and tails help the fish change direction and maintain balance while swimming.

(a) The hot-desert camel has a single hump; the cold-desert camel has two humps.
(b) The hot-desert camel has wide hooves to walk on sand without sinking. The cold-desert camel has strong hooves to grip mountainous terrain.
(c) The cold-desert camel grows long hair from head to neck to protect itself from the cold.

Introduction: A habitat is the natural environment where an organism lives, and adaptation refers to the special features that help organisms survive in their habitat.
Key Points:
1. Habitat defined — A habitat is the natural surroundings that provide food, water, air, and shelter for an organism to live and grow, such as a pond or forest.
2. Types of habitats — The two main types are terrestrial (deserts, mountains, forests, grasslands) and aquatic (ponds, rivers, oceans, lakes) habitats with different conditions.
3. Cactus spines — Desert plants like cactus have spines instead of leaves to minimise water loss through transpiration in hot, dry conditions.
4. Camel hump — Camels store fat in their hump as an energy reserve and excrete very little urine to conserve water in the desert.
5. Cactus stem — The thick, fleshy stem of desert plants stores large amounts of water and carries out photosynthesis to survive drought.
Conclusion: Different habitats support different organisms, and adaptations like spines, humps, and fleshy stems enable desert life to thrive in harsh conditions.

Introduction: Camels are remarkable animals that show different adaptations depending on whether they live in hot deserts or cold deserts.
Key Points:
1. Hot desert camel (Rajasthan) — The single-humped dromedary camel has long legs to stay above hot sand and stores fat in one hump for energy.
2. Cold desert camel (Ladakh) — The double-humped Bactrian camel has two humps for fat storage and a thick coat of fur to withstand freezing cold.
3. Water conservation (hot desert) — Hot desert camels excrete very little urine and have dry dung, minimising water loss in the scorching heat.
4. Thick fur (cold desert) — Bactrian camels grow thick, shaggy fur that insulates their body against the extremely low temperatures of Ladakh.
5. Common feature — Both types have broad, padded feet that help them walk on loose desert sand as well as rocky, snowy mountainous terrain.
Conclusion: While both camels share some features like padded feet, their hump number and fur thickness differ according to the desert climate they inhabit.

Introduction: Fish are perfectly adapted to live in water through several specialised features that enable them to move and breathe underwater.
Key Points:
1. Streamlined body — The spindle-shaped, streamlined body of a fish reduces water resistance, allowing it to swim swiftly and smoothly through water.
2. Gills for respiration — Fish possess gills that absorb dissolved oxygen from water, which is essential for their respiration and survival.
3. Fins and tail — Fins and a flattened tail help fish steer, balance, and propel themselves forward while swimming in the water body.
4. Scales on body — Scales cover the body and protect it from injury while also reducing friction as the fish moves through water.
5. Cannot survive on land — Fish cannot survive on land because their gills cannot absorb oxygen from air, and their body lacks lungs for breathing atmospheric air.
Conclusion: Fish are exclusively suited for aquatic life, and their gill-based respiration makes it impossible for them to survive on land.

Introduction: Mountain regions have cold climates with heavy snowfall, and the organisms living there show special adaptations to cope with these harsh conditions.
Key Points:
1. Cone-shaped trees — Deodar and pine trees are cone-shaped with sloping branches so that heavy snow slides off easily without breaking branches.
2. Needle-like leaves — Mountain trees have needle-like leaves with a waxy coating that reduces water loss and protects them from freezing temperatures.
3. Thick fur in animals — Animals like snow leopards and yaks have thick fur coats that provide insulation and keep them warm in freezing cold.
4. Strong hooves — Mountain animals like mountain goats have strong, sharp hooves that help them climb and grip on steep, rocky mountain slopes.
5. Body fat layer — Many mountain animals have a layer of fat beneath the skin that acts as insulation against the extreme cold of high altitudes.
Conclusion: Both plants and animals in mountain regions have evolved specific features like needle leaves and thick fur to survive the cold, snowy environment.

Introduction: Biodiversity is the variety of living organisms in a particular area, and it varies because different regions have different environmental conditions.
Key Points:
1. Biodiversity defined — Biodiversity refers to the wide variety of plants, animals, and microorganisms that exist in a particular habitat or region.
2. Regional differences — Organisms differ from region to region because factors like temperature, rainfall, soil, and altitude vary across different areas.
3. Adaptation and habitat link — Adaptations are special features that develop in response to the specific conditions of a habitat, ensuring survival there.
4. Example of variation — Rhododendrons are tall trees in the Himalayas but show different growth patterns in the Nilgiris due to differing climates.
5. Survival through adaptation — Organisms survive only when their adaptations match their habitat conditions; mismatched features lead to difficulty in survival.
Conclusion: Biodiversity exists because each region with its unique conditions shapes the adaptations of the organisms living there through natural processes.

Introduction: Deserts are extremely hot and dry habitats, and the plants and animals living there have evolved remarkable adaptations to survive with minimal water.
Key Points:
1. Spines in cactus — Desert plants like cactus have leaves modified into spines to reduce water loss by transpiration in the hot, dry desert.
2. Water-storing stems — Cactus plants have thick, fleshy stems that store large quantities of water for use during long periods of drought.
3. Deep roots — Desert plants develop long, deep root systems that reach far underground to absorb whatever little water is available in the soil.
4. Camel adaptations — Camels have long legs to avoid hot sand, a hump storing fat for energy, and excrete minimal urine to conserve water.
5. Nocturnal behaviour — Many desert animals are active at night when temperatures are cooler, reducing water loss from their bodies during the day.
Conclusion: These diverse adaptations of desert plants and animals collectively enable them to thrive despite the extreme heat and water scarcity of desert habitats.