Living Creatures: Exploring Their Characteristics – Long Answer Type Questions
Class 6
Science
Chapter 10
Living Creatures: Exploring Their Characteristics — 30 Long Answer Questions
CBSE Board Examinations
Answer length: concise yet detailed (4–8 sentences) — include definitions, examples and short explanations.
Exam Guidance
- Read questions carefully and start answers with a clear definition or statement.
- Use one-line examples and briefly explain the reason or mechanism where asked.
- Keep answers structured: Definition → Key points/steps → Example/observation.
Fundamentals: Understanding Life and Life Processes
1. Define a living organism and explain the role of life processes in distinguishing living from non-living things.
A living organism is a system that carries out essential life processes such as nutrition, respiration, growth, reproduction, excretion and response to stimuli. These processes together maintain the internal organisation and allow the organism to grow, obtain energy, repair itself and produce new individuals. Non-living things may show isolated features like movement but cannot perform these processes independently. Identifying life processes helps us classify objects correctly as living or non-living in science and everyday observations.
2. List and briefly describe the main life processes covered in Class 6 NCERT.
The main life processes are: (1) Nutrition — obtaining and using food for energy; (2) Respiration — breaking down food to release energy; (3) Movement — locomotion or movement of parts; (4) Sensitivity/Response — reacting to stimuli; (5) Growth — irreversible increase in size and cell number; (6) Reproduction — producing offspring; (7) Excretion — removing metabolic wastes. Each process is essential for survival and can be observed through examples and simple classroom experiments.
3. Explain why the mnemonic MRSGREN is useful and what each letter stands for.
MRSGREN is a memory aid summarising the life processes: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion and Nutrition. It helps students recall all the essential functions that define living organisms quickly during exams. Using mnemonics reduces omission errors in answers and structures responses so students can expand each term with a brief example or explanation, improving clarity and completeness.
Movement & Growth
4. Differentiate between locomotion and movement of parts in organisms with examples.
Locomotion refers to the whole-body movement of an organism from one place to another, such as a bird flying or an animal walking. Movement of parts is local movement within an organism, often growth-driven, like the bending of plant stems toward light (phototropism) or opening and closing of flowers. Both types of movement result from biological processes: muscles and limbs in animals for locomotion; cell elongation and differential growth in plants for movement of parts.
5. Describe an experiment to demonstrate plant movement toward light and explain the observation.
Place a potted plant near a window where light comes from one side; after several days the plant stem bends toward the light. This occurs because cells on the darker side elongate more than those on the lighted side, causing curvature—phototropism. The experiment illustrates sensitivity and directed growth: plants optimise light capture for photosynthesis, a crucial part of nutrition. Record observations with dates to show gradual bending.
6. Explain how growth differs from temporary change in size using suitable examples.
Growth is an irreversible biological process involving increase in size and cell number—seen in seed germination to mature plant or baby to adult in animals. Temporary changes, like a balloon inflating or sugar dissolving, do not involve cell production or biological activity and are reversible. Growth requires nutrition and energy and is a hallmark of living organisms; temporary physical changes are due to external forces and do not indicate life.
Respiration & Excretion
7. Define respiration and differentiate between breathing and cellular respiration.
Respiration is the biochemical process where organisms break down food molecules to release energy needed for life activities. Breathing is the physical inhalation and exhalation of air (seen in many animals) and serves to exchange gases; cellular respiration occurs inside cells at the molecular level to produce ATP energy, using oxygen and producing carbon dioxide. While breathing facilitates gas supply for cellular respiration, the latter is the actual energy-releasing chemical process in cells.
8. How do plants and animals differ in excretion? Provide examples.
Animals excrete waste products like carbon dioxide, urine and sweat through organs such as lungs, kidneys and skin. Plants excrete oxygen as a by-product of photosynthesis and remove some wastes by storing them in leaves or roots or releasing them through stomata. For example, humans exhale carbon dioxide and produce urine via kidneys, while plants release oxygen during the day and may shed leaves containing waste products.
9. Why is excretion necessary for organisms? Explain the consequences of failed excretion.
Excretion removes toxic metabolic wastes like ammonia, urea and carbon dioxide, maintaining internal balance (homeostasis). Without excretion, waste products accumulate, interfering with biochemical reactions, damaging tissues and potentially causing illness or death. Efficient excretory systems enable continued metabolism and survival; for example, kidney failure in humans leads to dangerous toxin build-up requiring medical intervention.
Sensitivity & Response to Stimuli
10. Explain with examples how organisms respond to stimuli and why this is important.
Organisms detect environmental changes and respond to increase survival — animals may flee from predators, plants bend toward light (positive phototropism) to maximise photosynthesis, and roots grow toward moisture (hydrotropism). These responses ensure access to resources, protection and reproduction. For instance, touching Mimosa pudica causes rapid leaf folding, which may protect it from harm; such responses are crucial adaptations shaped by evolution.
11. Describe an experiment to show sensitivity in animals suitable for Class 6 practicals.
A simple experiment: observe earthworms in moist soil under light; they move away from bright light and into shade, showing sensitivity to light (photoreactivity). Record the direction and speed of movement. This demonstrates behaviour change in response to stimuli and can be safely conducted under supervision, highlighting sensory detection and response mechanisms in animals.
Nutrition & Photosynthesis
12. Explain autotrophic and heterotrophic nutrition with examples.
Autotrophic organisms, like green plants, make their own food via photosynthesis using sunlight, water and carbon dioxide; they are primary producers in ecosystems. Heterotrophs, like animals and fungi, obtain food by consuming other organisms or organic matter—for example, humans eat plants and animals, while fungi decompose dead matter. These nutritional modes define ecological relationships and energy flow through food chains.
13. Describe photosynthesis in simple terms and explain its significance for life on Earth.
Photosynthesis is the process by which green plants convert carbon dioxide and water into glucose and oxygen using sunlight and chlorophyll. It provides the primary source of organic matter and oxygen for almost all life forms, forming the base of food chains. Photosynthesis also regulates atmospheric carbon dioxide, influencing climate and enabling aerobic respiration in animals and plants.
14. Provide a classroom activity to demonstrate the need for sunlight in photosynthesis.
Keep two similar potted plants; place one in sunlight and one in shade for several days. Test leaves for starch using iodine under teacher supervision—leaves exposed to sunlight should turn blue-black, indicating starch (product of photosynthesis), while shaded leaves show less or no starch. This simple test demonstrates sunlight’s essential role in food production by plants.
Reproduction
15. Discuss sexual and asexual reproduction and state one advantage of each.
Sexual reproduction involves two parents and fusion of gametes, producing genetically varied offspring—advantage: genetic diversity increases adaptability. Asexual reproduction involves a single parent producing genetically similar offspring (e.g., budding in yeast, vegetative propagation in plants)—advantage: rapid multiplication without needing a partner. Both strategies have ecological roles: sexual reproduction fosters evolution; asexual reproduction allows quick colonisation.
16. Explain the role of seeds in plant reproduction and how seeds are adapted for dispersal.
Seeds contain the plant embryo and stored food that supports germination and seedling growth. Many seeds have adaptations for dispersal—wings in maple seeds for wind dispersal, burrs that stick to animals, or fleshy fruits consumed by animals whose droppings disperse seeds. These adaptations reduce competition between parent and offspring and help colonise new habitats, enhancing species survival.
Classification: Vertebrates and Invertebrates
17. Why is classification important in biology and what basic groups are introduced in Class 6?
Classification organises the enormous variety of living organisms into groups based on shared features, making study and communication easier. Class 6 introduces the basic division into vertebrates (animals with backbone) and invertebrates (without backbone), and further examples like fishes, amphibians, reptiles, birds and mammals for vertebrates, and insects, worms and molluscs among invertebrates. This foundational scheme prepares students for more detailed classification later.
18. Describe three distinguishing features of mammals with examples.
Mammals generally possess hair or fur, are warm-blooded, and females produce milk to feed young (mammary glands). Examples include humans, dogs and whales. These features distinguish mammals from other vertebrates like reptiles or birds, and support diverse lifestyles, including parental care and endothermy for habitat adaptation.
19. Give characteristics and examples of two invertebrate groups commonly taught in Class 6.
Insects typically have three body segments (head, thorax, abdomen), six legs and often wings (e.g., butterflies). Earthworms are annelids with segmented bodies that aid in burrowing and soil aeration. Both groups lack backbones and show diverse adaptations for feeding, movement and life cycles, playing key ecological roles like pollination (insects) and soil fertility (worms).
Comparisons & Applications
20. Compare breathing and photosynthesis with regard to gases exchanged and overall purpose.
Breathing (in animals) involves taking in oxygen and releasing carbon dioxide to support cellular respiration and energy release. Photosynthesis (in plants) uses carbon dioxide and sunlight to produce glucose and release oxygen, storing energy. While breathing releases energy from food, photosynthesis creates food; together they form a cyclical exchange of gases essential for life on Earth.
21. How does understanding life processes help in daily life and health?
Knowledge of life processes informs hygiene, nutrition and health choices—understanding nutrition guides balanced diets; respiration knowledge explains the need for fresh air; excretion concepts emphasise kidney health and hydration. This understanding supports preventive care, proper growth in children and informed responses to common health issues.
22. Explain how organisms are adapted for survival with two specific examples.
Adaptations are traits that improve survival: cacti have thick stems and reduced leaves to conserve water in deserts; birds have hollow bones and wings enabling flight for food search and escape. These morphological and physiological features evolved to match environmental demands, enhancing food acquisition, reproduction and protection from predators.
Practical Skills & Experiments
23. Outline safe classroom procedures for demonstrating respiration in humans.
A simple demonstration: measure breathing rate at rest and after mild exercise (e.g., jumping jacks) by counting breaths per minute, under supervision. Ensure students are healthy, avoid strenuous activity, and have water and rest. Record results and discuss how exercise increases breathing rate to meet higher oxygen demand and remove carbon dioxide—linking observations to cellular respiration.
24. Describe a safe activity to show seeds germinate and how it demonstrates growth.
Place soaked seeds between moist cotton in a transparent container and keep in light; observe root and shoot emergence over days. Measure growth daily and record changes, demonstrating irreversible increase in size and development. Ensure clean setup and gentle handling to prevent mould and provide consistent moisture and temperature for reliable results.
Higher-order Thinking
25. Explain why some organisms reproduce asexually while others rely on sexual reproduction.
Asexual reproduction is efficient and rapid, advantageous in stable environments where a successful genotype can be replicated (e.g., bacteria, some plants). Sexual reproduction introduces genetic variation, beneficial in changing environments for adaptation and disease resistance. Evolutionary pressures and ecological contexts determine which strategy dominates: many organisms can even use both methods under different conditions.
26. How can classifying organisms into vertebrates and invertebrates be useful for beginners in biology?
This basic classification simplifies the study of animal diversity by grouping organisms with major anatomical differences (presence/absence of backbone). It helps students compare physiology, habitats and life cycles across groups and lays groundwork for more detailed taxonomy later. For example, grouping allows quick identification and understanding of shared traits within each group.
Revision & Exam Tips
27. Suggest a structured approach for answering a 5-mark question on life processes in an exam.
Start with a clear definition, list 3–4 main points or steps, give brief examples and conclude with a linking sentence. For example, define respiration, state how it releases energy, mention gases involved and provide an example like human breathing. Use numbered points and a short example to score marks for content and clarity.
28. Provide a sample 5-mark answer describing how plants perform nutrition and why they are important.
Definition: Plants perform autotrophic nutrition using photosynthesis. Process: Chlorophyll in leaves captures sunlight; carbon dioxide and water are used to make glucose and oxygen; glucose provides energy and building material. Importance: Plants are primary producers forming the base of food chains and producing oxygen necessary for respiration in animals. Example: Green plants in fields and forests sustain herbivores and through food chains support higher trophic levels.
29. How should students prepare for diagram-based questions on classification or life processes?
Practice clear, labelled diagrams with neat headings and arrows; learn to label only the necessary parts and add a brief caption explaining the process. For classification charts, use simple tables listing features and examples. Time practice with sketches to improve speed and accuracy under exam conditions.
30. Give final tips to memorise examples and definitions effectively for this chapter.
Use flashcards with the term on one side and definition plus one example on the other; group similar items (e.g., vertebrate groups) and revisit them daily. Teach someone else, draw quick mind maps linking life processes and examples, and do short quizzes to reinforce recall. Regular, spaced revision beats cramming and helps in long-term retention for exams.
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