CBSE Important Questions for Class 6 Science Living Creatures - 2025-26

1. What are living creatures? Describe their basic characteristics.

Living creatures, or organisms, are entities that exhibit life. They grow, reproduce, and respond to their surroundings. Basic characteristics include growth, where they increase in size; reproduction, allowing them to create offspring; and respiration, providing energy. They also exhibit sensitivity, reacting to environmental changes. Nutrition is crucial, as they require food for energy and growth. Excretion helps them remove waste from their bodies. These traits distinguish living organisms from non-living things.

2. What is the difference between living and non-living things?

Living things, such as plants and animals, show specific characteristics like growth, reproduction, and response to stimuli. In contrast, non-living things, like rocks and water, do not possess these qualities. Living organisms can carry out essential life processes, while non-living things cannot grow or reproduce. For example, a tree grows and produces seeds, while a chair does not change or replicate. This distinction is fundamental in biology. The presence of life processes is what classifies an entity as living. Understanding this difference is crucial for studying life sciences.

3. How do plants and animals differ in their characteristics?

Plants and animals have distinct characteristics that set them apart. Plants are autotrophs, meaning they produce their food through photosynthesis, using sunlight, carbon dioxide, and water. In contrast, animals are heterotrophs, relying on other organisms for food. Plants are generally stationary, and anchored in one place, while animals can move freely to find food and shelter. Reproduction methods also differ; plants may reproduce through seeds or spores, while animals often have complex reproductive systems involving mating. Additionally, plants have cell walls, while animals do not. These differences highlight the unique adaptations of each group.

4. What are the different types of living creatures?

Living creatures can be broadly categorized into two main types: plants and animals. Plants, which are producers, can make their food through photosynthesis and have cell walls. They include various species such as trees, shrubs, and flowers. Animals, on the other hand, are consumers and cannot produce their food. They rely on plants or other animals for nutrition. Animals are further divided into vertebrates, which have a backbone, and invertebrates, which lack a backbone. This classification helps in understanding the diversity of life forms on Earth.

5. Explain the term ‘habitat’ and its importance for living creatures.

A habitat is the natural environment where a living creature resides, providing essential resources for survival. It includes factors like food, water, shelter, and mates for reproduction. The habitat is crucial for the growth and development of organisms. Different species are adapted to specific habitats, such as forests, deserts, or oceans, which influence their behaviour and physical traits. For instance, a frog's habitat is near water, while a cactus thrives in dry environments. Maintaining healthy habitats is vital for biodiversity and the overall balance of ecosystems. Disruptions to habitats can lead to species decline or extinction.

6. What are vertebrates? Give examples.

Vertebrates are animals that possess a backbone or spine, belonging to the phylum Chordata. This group includes various species with different characteristics and adaptations. Examples of vertebrates are mammals like humans, dogs, and cats, which are warm-blooded and often have fur. Birds, such as eagles and sparrows, are also vertebrates, characterised by feathers and beaks. Reptiles like snakes and lizards, amphibians such as frogs, and fish like goldfish and sharks also fall under this category. Vertebrates play important roles in their ecosystems, contributing to food chains and biodiversity.

7. What are invertebrates? Give examples.

Invertebrates are animals that do not have a backbone, making up a significant portion of the animal kingdom. They exhibit a wide variety of forms and adaptations to survive in different environments. Common examples of invertebrates include insects like butterflies and ants, which have exoskeletons and jointed limbs. Arachnids, such as spiders and scorpions, also belong to this group, recognized by their eight legs. Molluscs, including snails and octopuses, are known for their soft bodies and shells. Crustaceans like crabs and lobsters are also invertebrates, often found in aquatic environments. Invertebrates play crucial roles in ecosystems, such as pollination and nutrient cycling.

8. What is the role of plants in the ecosystem?

Plants play a vital role in the ecosystem as primary producers. Through photosynthesis, they convert sunlight, water, and carbon dioxide into glucose and oxygen, forming the base of the food chain. This process not only provides energy for themselves but also supports herbivores and, subsequently, carnivores. Plants also contribute to soil health by preventing erosion and improving nutrient content. Additionally, they provide habitat and shelter for various organisms, enhancing biodiversity. Their presence helps regulate the atmosphere by absorbing carbon dioxide and releasing oxygen. Overall, plants are essential for sustaining life on Earth.

9. How do animals adapt to their environments?

Animals adapt to their environments in various ways to survive and thrive. Physical adaptations include changes in body structure, like the thick fur of polar bears for insulation in cold climates. Behavioural adaptations involve changes in habits, such as nocturnal animals being active at night to avoid daytime heat. Physiological adaptations are internal changes, such as camels' ability to conserve water in arid regions. These adaptations ensure that animals can find food, reproduce, and escape predators. Natural selection drives these changes, allowing species to become better suited to their habitats over time. Adaptation is crucial for the survival of species in changing environments.

10. What is photosynthesis? Why is it important for living organisms?

Photosynthesis is the process through which green plants convert sunlight, water, and carbon dioxide into glucose and oxygen. This vital process occurs primarily in the chloroplasts of plant cells, where chlorophyll captures sunlight. Photosynthesis is crucial because it serves as the foundation of the food chain, providing energy for plants and, indirectly, for herbivores and carnivores. Additionally, it produces oxygen, which is essential for the survival of most living organisms. The glucose generated is used by plants for energy and growth. This process plays a significant role in regulating atmospheric gases, contributing to a stable ecosystem.

11. What are the characteristics of mammals?

Mammals are a distinct class of animals with several defining characteristics. They possess hair or fur on their bodies, providing insulation and protection. Mammals are warm-blooded, allowing them to maintain a constant body temperature regardless of the environment. Most mammals give birth to live young instead of laying eggs, although there are exceptions like the monotremes. Female mammals have mammary glands that produce milk to nourish their offspring. Additionally, mammals have a complex brain structure, which supports advanced behaviours and social structures. These traits enable mammals to adapt to various habitats and thrive in diverse ecosystems.

12. Explain the concept of food chains.

A food chain illustrates the flow of energy and nutrients through an ecosystem. It shows how living organisms are interconnected by their feeding relationships. In a simple food chain, the sun provides energy to producers like plants, which convert sunlight into food through photosynthesis. Primary consumers, such as herbivores, eat these plants, while secondary consumers, or carnivores, feed on the herbivores. This chain continues with tertiary consumers, which prey on the secondary consumers. Each link in the food chain plays a crucial role in maintaining the ecosystem's balance. Disruptions to one part of the chain can affect all other organisms involved.

13. What is the importance of biodiversity?

Biodiversity refers to the variety of living organisms in an ecosystem, including species, genetic variation, and ecosystems. Its importance lies in several key areas. Firstly, a diverse ecosystem is more resilient and can better withstand environmental changes and disruptions. Secondly, biodiversity provides essential resources such as food, medicine, and raw materials, supporting human livelihoods. Thirdly, different species contribute to cultural and recreational activities, enriching human experiences. Finally, biodiversity is crucial for ecological balance, as each species plays a unique role in maintaining the environment. Protecting biodiversity ensures a sustainable future for all life on Earth.

14. How do living organisms interact with their environment?

Living organisms interact with their environment in multiple ways. They obtain resources such as food, water, and shelter from their surroundings, which are vital for survival. Organisms adapt their behaviours and physical traits to fit their habitat, enhancing their chances of survival. For example, a bird might build a nest in a tree to provide shelter for its young. Additionally, organisms influence their environment; plants can change soil composition, while animals can alter landscapes through their movements. These interactions create a complex web of relationships that support life in ecosystems. Understanding these interactions is essential for studying ecology and conservation.

15. What are the different modes of reproduction in living organisms?

Living organisms reproduce in two main ways: asexual and sexual reproduction. Asexual reproduction involves a single organism producing offspring without the involvement of another. This method is common in bacteria and some plants, resulting in genetically identical offspring. Sexual reproduction, on the other hand, requires two organisms, typically a male and a female, to contribute genetic material to produce offspring. This method promotes genetic diversity, which is important for adaptation and evolution. Different species exhibit various reproductive strategies, such as external fertilisation in fish and internal fertilisation in mammals. Understanding these modes is vital for studying biology and ecology.

16. Describe the importance of reproduction for living organisms.

Reproduction is essential for the survival of living organisms as it ensures the continuation of a species. Through reproduction, organisms produce offspring, passing on their genetic material and traits. This process helps maintain population sizes and enables species to adapt to changing environments. Sexual reproduction introduces genetic diversity, which is crucial for the evolution and adaptability of species. A diverse gene pool enhances the ability of populations to withstand diseases and environmental pressures. Additionally, reproduction plays a role in ecological balance, as it supports food chains and ecosystems. Overall, reproduction is fundamental for life on Earth.

17. What are the adaptations of desert animals?

Desert animals have unique adaptations that help them survive in harsh, arid environments. One key adaptation is water conservation; many desert animals can go for extended periods without drinking, as seen in camels, which store fat in their humps that can be converted to water. Nocturnal behaviour is another adaptation, allowing animals like foxes and rodents to be active at night when temperatures are cooler. Additionally, some desert animals have developed physiological adaptations, such as the ability to tolerate high temperatures and regulate body temperature. These adaptations are vital for their survival, allowing them to thrive in an environment with limited resources.

18. Explain the term ‘ecosystem’.

An ecosystem is a community of living organisms interacting with one another and their physical environment. It includes biotic factors like plants, animals, and microorganisms, as well as abiotic factors like soil, water, and climate. Ecosystems can vary in size, from a small pond to a large forest, and can be terrestrial or aquatic. The interactions within an ecosystem create a dynamic system where energy and nutrients cycle through food webs and chains. Each organism plays a specific role, contributing to the overall health and balance of the ecosystem. Understanding ecosystems is essential for conservation and environmental management.

19. How do aquatic plants differ from terrestrial plants?

Aquatic plants are specially adapted to live in water, displaying several distinct characteristics. They often have floating leaves that allow them to receive sunlight while remaining submerged. Their stems are usually soft and flexible, enabling them to withstand water currents and tides. Additionally, many aquatic plants have air spaces in their tissues, which help them stay buoyant. Unlike terrestrial plants, which have deep root systems to anchor them in soil, aquatic plants have shallow roots that help absorb nutrients from the water. These adaptations are crucial for their survival and growth in aquatic environments.

20. What are some examples of food chains in different ecosystems?

Food chains illustrate the flow of energy through various ecosystems. In a forest ecosystem, a simple food chain could be:

• Sunlight → Tree (producer) → Deer (primary consumer) → Wolf (secondary consumer).
  In an aquatic ecosystem, another example is:

• Phytoplankton (producer) → Zooplankton (primary consumer) → Fish (secondary consumer) → Shark (tertiary consumer).
  These examples demonstrate how energy flows from producers to consumers, highlighting the interconnectedness of organisms within their environments. Understanding food chains is essential for studying ecosystem dynamics and energy transfer.

21. Why is it important to protect endangered species?

Protecting endangered species is crucial for several reasons. Firstly, each species plays a unique role in its ecosystem, contributing to its balance and health. Losing a species can disrupt food chains and lead to ecological imbalances. Secondly, biodiversity is vital for human survival, as many species provide food, medicine, and other resources. Protecting endangered species also preserves genetic diversity, which is essential for adaptability and resilience against diseases and environmental changes. Additionally, many species hold cultural and economic significance, contributing to tourism and local economies. Overall, protecting endangered species ensures a sustainable future for our planet.

22. What is the significance of plant classification?

Plant classification is important for several reasons. It aids in the identification and study of various plant species, making it easier for scientists and researchers to communicate about them. Understanding the relationships between different plants helps in studying their evolutionary history and ecological roles. Additionally, classification provides valuable information for agriculture, horticulture, and conservation efforts. By identifying plants and their uses, we can promote sustainable practices and protect endangered species. Overall, plant classification enhances our knowledge of biodiversity and helps manage natural resources effectively.

23. How do external features help in identifying animals?

External features play a significant role in identifying animals. Characteristics such as size, shape, colour, and patterns can provide important clues about a species. For instance, the distinctive stripes of a tiger or the spots on a leopard help differentiate them from other big cats. Physical features like beak shape in birds can indicate their feeding habits, while fur texture may reveal information about their habitat. External features are often the first indicators used in classification and identification. Observing these traits helps scientists and enthusiasts understand animal behaviour and ecology better. Accurate identification is essential for conservation efforts and ecological research.

24. What are the main characteristics of amphibians?

Amphibians are a unique class of animals with specific characteristics. They typically exhibit a dual life, living both in water (as larvae) and on land (as adults). This transition often involves changes in their physiology and behaviour. Amphibians have moist, permeable skin, allowing for gas exchange; this means they can absorb oxygen and release carbon dioxide through their skin. They are also cold-blooded, relying on environmental temperatures to regulate their body heat. Common examples include frogs, toads, and salamanders, all of which have adaptations that support their life in aquatic and terrestrial habitats.

25. Discuss the role of decomposers in the ecosystem.

Decomposers, including fungi and bacteria, play a vital role in ecosystems by breaking down dead organic matter. They recycle nutrients back into the soil, making them available for plants to use. This process of decomposition is essential for maintaining soil health and fertility. Decomposers help clean up the environment by consuming waste products and dead organisms, preventing the accumulation of harmful materials. Their activities contribute to nutrient cycling, which supports the growth of plants and the overall health of the ecosystem. Without decomposers, ecosystems would be overwhelmed with waste, and the energy flow through food chains would be disrupted.

Extra Questions for Class 6 Science Chapter 10 Living Creatures: Exploring their Characteristics

Short Answer Questions:

1. What is the role of respiration in living organisms?
Answer: Respiration is the process by which living organisms convert food into energy, facilitating growth, movement, and other vital functions.

2. How do plants respond to light?
Answer: Plants exhibit phototropism, where their stems and leaves grow towards light sources to maximize photosynthesis.

3. What is the significance of reproduction in living organisms?
Answer: Reproduction ensures the continuation of species by producing offspring, maintaining population numbers, and contributing to genetic diversity.

4. Describe the life cycle of a butterfly.
Answer: The butterfly life cycle includes four stages: egg, larva (caterpillar), pupa (chrysalis), and adult butterfly, each with distinct characteristics and durations.

Very Short Answer Questions:

1. What is excretion in living organisms?
Answer: Excretion is the process of eliminating waste products from the body to maintain internal balance and health.

2. Do plants exhibit movement? If yes, provide an example.
Answer: Yes, plants can move; for instance, the Mimosa pudica plant folds its leaves when touched.

3. What is germination?
Answer: Germination is the process by which a seed develops into a new plant, starting with the growth of the embryo within the seed.

4. Name the two worm-like stages in the life cycle of mosquitoes.
Answer: The larva and pupa stages are the two worm-like stages in a mosquito's life cycle.

Long Answer Questions:

5. Explain the differences between living and non-living things.
Answer: Living things exhibit characteristics such as growth, movement, respiration, reproduction, sensitivity to stimuli, and nutrition. Non-living things do not display these traits; they do not grow, reproduce, or respond to environmental changes.

6. Discuss the importance of nutrition in living organisms.
Answer: Nutrition provides essential nutrients and energy required for growth, development, maintenance, and overall health of living organisms. It supports metabolic activities and helps in repairing tissues.

7. Describe the various types of movements observed in plants.
Answer: Plants exhibit several types of movements, including:

• Phototropism: Growth towards light.

• Gravitropism (Geotropism): Growth in response to gravity; roots grow downward, and stems grow upward.

• Thigmotropism: Response to touch; seen in climbing plants and the sensitive Mimosa plant.

• Nastic Movements: Non-directional responses to stimuli, such as the opening and closing of flowers.

8. Illustrate the life cycle of a frog with a diagram.
Answer: The frog's life cycle includes

• Egg: Laid in water.

• Tadpole (Larva): Aquatic, free-swimming stage with gills for respiration.

• Tadpole with Limbs: Development of legs and reduction of tail.

• Adult Frog: Fully developed frog capable of living both in water and on land.

Practising important questions from CBSE Class 6 Science Chapter 10 – Living Creatures: Exploring their Characteristics is a great way to get ready for exams. By working through short and long answer questions, extra practice, and test papers, you'll improve your understanding of the topic. 

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