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NCERT Class 10 Science Life Processes: In-text questions (page 81) Solutions

AI-written, checked on 23 Oct 2026

Solutions written by Shishya, checked — not the board's official answers

Step-by-step working for every question of In-text questions (page 81) in NCERT's Class 10 Science book, chapter “Life Processes”, written by Shishya. Each question is in our own short words; open the NCERT chapter for the exact wording and figures.

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How these were checked: the solutions were drafted with AI and then read and corrected on 23 Oct 2026. Every numerical final answer is recomputed from the question's own numbers by a calculator check that runs before each release; proofs and explanations were read, not machine-checked. The NCERT textbook is the authority — if something here disagrees with it, follow the book.

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  1. In-text (page 81) Q1

    Why is diffusion not enough to meet the oxygen needs of multicellular organisms like humans?

    1. Diffusion is a slow process that works best over very short distances.
    2. In multicellular organisms like humans, cells are located deep inside the body, far from the external environment.
    3. The rate of diffusion is too low to transport enough oxygen to all the body's cells quickly.
    4. Humans have a high metabolic rate and require a large, continuous supply of oxygen for cellular respiration.
    5. Therefore, a specialized transport system is needed to move oxygen rapidly throughout the body.

    Answer: Diffusion is too slow to meet the high oxygen demands of multicellular organisms like humans due to the large distance between the external environment and internal cells.

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  2. In-text (page 81) Q2

    What criteria do we use to decide whether something is alive?

    1. Living organisms carry out essential life processes such as respiration, growth, and reproduction.
    2. They also respond to external stimuli and maintain a steady internal environment.
    3. Non-living things do not perform these biological functions on their own.
    4. The presence of these specific activities is the main criterion to identify life.

    Answer: We use the presence of life processes like respiration, growth, reproduction, and response to stimuli as criteria to decide if something is alive.

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  3. In-text (page 81) Q3

    What does an organism use outside raw materials for?

    1. Organisms use outside raw materials to build their body structures.
    2. These materials are also used to obtain energy for life activities.
    3. They help in growth, repair, and maintenance of the body.

    Answer: Organisms use outside raw materials for building body structures, obtaining energy, and maintaining growth and repair.

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  4. In-text (page 81) Q4

    Which processes are essential for maintaining life?

    1. Life processes are the basic activities that all living organisms must perform to stay alive.
    2. Nutrition is essential to take in food and convert it into energy and building materials.
    3. Respiration is required to break down food and release energy for cellular activities.
    4. Transportation moves nutrients, gases, and waste products within the body.
    5. Excretion removes harmful metabolic wastes from the body to prevent toxicity.
    6. Growth and reproduction ensure the continuation of the species and development of the organism.

    Answer: Nutrition, respiration, transportation, excretion, growth, and reproduction are essential for maintaining life.

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