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  1. Asked: In:

    Observe the set-up given in Fig. 2.15 and answer the following questions: (i) What happens to the sugar solution in flask A? (ii) What do you observe in test tube B after four hours? Why do you think this happened? (iii) What would happen if yeast was not added in flask A?

    Piyush365

    (i) In flask A, yeast ferments the sugar, releasing carbon dioxide. (ii) In test tube B, gas bubbles appear, showing the presence of CO₂. (iii) Without yeast in flask A, fermentation doesn’t happen, so no gas is released and the test tube B remains unchanged. This experiment demonstrates that yeastRead more

    (i) In flask A, yeast ferments the sugar, releasing carbon dioxide.
    (ii) In test tube B, gas bubbles appear, showing the presence of CO₂.
    (iii) Without yeast in flask A, fermentation doesn’t happen, so no gas is released and the test tube B remains unchanged. This experiment demonstrates that yeast is essential for fermentation and gas production.

     

    For more NCERT Solutions for Class 8 Science Curiosity Chapter 2 The Invisible Living World: Beyond Our Naked Eye Extra Questions & Answer:

    https://www.tiwariacademy.com/ncert-solutions/class-8/science/

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    • 17
  2. Asked: In:

    Fermented food items like fermented soybeans and fermented bamboo shoots are consumed as traditional food in some parts of India. With the help of your parents and teachers, list some traditional food items from your area that utilise the process of fermentation. Investigate the ingredients used in the preparation of these fermented food items; the method of preparing them; the microorganism responsible for the fermentation of the food and the cultural and nutritional importance of the fermented food.

    Piyush365

    Traditional fermented foods like idli, dosa, curd, pickles and fermented rice are prepared using microorganisms like yeast and Lactobacillus. These foods promote gut health, improve digestion and enhance nutritional value. Fermentation also preserves food naturally. In many cultures, such foods holdRead more

    Traditional fermented foods like idli, dosa, curd, pickles and fermented rice are prepared using microorganisms like yeast and Lactobacillus. These foods promote gut health, improve digestion and enhance nutritional value. Fermentation also preserves food naturally. In many cultures, such foods hold historical and health significance, passed down through generations for their taste and medicinal benefits.

     

    For more NCERT Solutions for Class 8 Science Curiosity Chapter 2 The Invisible Living World: Beyond Our Naked Eye Extra Questions & Answer:

    https://www.tiwariacademy.com/ncert-solutions/class-8/science/

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    • 82
  3. Asked: In:

    Study the different parts of a macro fungus mushroom using a magnifying glass and microscope/foldscope. Take the help of students from senior classes and explore the internal structure of different parts of mushrooms under the microscope/foldscope in your school laboratory.

    Piyush365

    To study mushroom parts, collect a mature mushroom and observe its external parts—cap, stalk and gills—using a magnifying glass. With a foldscope or microscope, examine spores and cell structures on the gills. Seniors or teachers can guide you. This study helps understand fungi’s reproductive partsRead more

    To study mushroom parts, collect a mature mushroom and observe its external parts—cap, stalk and gills—using a magnifying glass. With a foldscope or microscope, examine spores and cell structures on the gills. Seniors or teachers can guide you. This study helps understand fungi’s reproductive parts and structure, enhancing knowledge of non-green organisms that play important ecological roles in decomposition.

     

    For more NCERT Solutions for Class 8 Science Curiosity Chapter 2 The Invisible Living World: Beyond Our Naked Eye Extra Questions & Answer:

    https://www.tiwariacademy.com/ncert-solutions/class-8/science/

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    • 0
  5. Asked: In:

    Interact with an entrepreneur and learn the steps for cultivation of mushroom.

    Piyush365

    After interacting with a mushroom-growing entrepreneur, I learnt the following steps for cultivating mushrooms: Steps for Mushroom Cultivation: Selection of Mushroom Type Common types include Oyster, Button, and Milky mushrooms. Each requires different conditions. Preparation of Substrate SubstrateRead more

    After interacting with a mushroom-growing entrepreneur, I learnt the following steps for cultivating mushrooms:

    Steps for Mushroom Cultivation:

    1. Selection of Mushroom Type
      • Common types include Oyster, Button, and Milky mushrooms. Each requires different conditions.
    2. Preparation of Substrate
      • Substrate is the material used for growing mushrooms, such as paddy straw, sawdust, or compost.
      • The substrate is cut into pieces and soaked in water for several hours.
    3. Pasteurisation
      • The wet substrate is steamed or heated to kill unwanted microbes. This prevents contamination.
    4. Spawning
      • Mushroom spawn (seed) is mixed with the cooled substrate evenly.
    5. Bag Filling and Incubation
      • The substrate with spawn is filled into poly bags or trays, with small holes for air.
      • Bags are kept in a dark, warm, and humid room (around 25–28°C) for 15–20 days until white fungal threads (mycelium) spread.
    6. Fruiting Stage
      • After incubation, bags are opened and moved to a cooler, lighted space with good air circulation and high humidity.
      • Mushrooms start forming within 1–2 weeks.
    7. Harvesting
      • Mushrooms are ready to be harvested when the cap opens fully. They are carefully twisted and plucked by hand.
    8. Packaging and Selling
      • Fresh mushrooms are cleaned, packed in plastic trays or pouches, and sold in the market. Some are dried for storage.

     

    🌱 Key Requirements:

    • Clean environment
    • Proper humidity and ventilation
    • Temperature control
    • Fresh, sterilised substrate
    • Hygiene to prevent contamination

     

    For more NCERT Solutions for Class 8 Science Curiosity Chapter 2 The Invisible Living World: Beyond Our Naked Eye Extra Questions & Answer:

    https://www.tiwariacademy.com/ncert-solutions/class-8/science/

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    • 81
  6. Asked: In:

    Have you ever noticed the smallest organism around you that is visible to the naked eye?

    Piyush365

    Some microorganisms like mold colonies on bread and mildew are visible to the naked eye as tiny spots. Among living beings, tiny insects like ants, lice or fruit flies are often the smallest visible organisms. Observing these small life forms helps develop curiosity about the microscopic world thatRead more

    Some microorganisms like mold colonies on bread and mildew are visible to the naked eye as tiny spots. Among living beings, tiny insects like ants, lice or fruit flies are often the smallest visible organisms. Observing these small life forms helps develop curiosity about the microscopic world that exists beyond what our eyes can easily see.

     

    For more NCERT Solutions for Class 8 Science Curiosity Chapter 2 The Invisible Living World: Beyond Our Naked Eye Extra Questions & Answer:

    https://www.tiwariacademy.com/ncert-solutions/class-8/science/

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