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Forests: Our Lifeline Class 7 Free Notes and Mind Map (Free PDF Download)

forest

Visit to a Forest


Forests Give Us Stuff


Observing Trees


Decomposition and Heat


Why Forests Matter

Forests are super important! They’re like a big, green lifeline for animals, plants, and people. They give us stuff we use every day, keep the air and water clean, and make sure nature stays balanced. Next time you see a tree, think about how it’s helping the whole planet.

Questions and Answers

  1. How animals dwelling in the forest help it grow and regenerate:
    • Animals disperse the seeds of certain plants, aiding forest growth and regeneration.
    • Animal droppings provide nutrients to seedlings, supporting their growth.
    • Herbivores help maintain plant variety, which in turn supports a variety of carnivores.
    • Decomposers help in maintaining the supply of nutrients to the growing plants in the forest.
  2. How forests prevent floods:
    • Forests act as a natural absorber of rainwater, allowing it to seep into the ground.
    • This helps maintain the water table throughout the year.
    • The forest canopy and layers of vegetation slow down the speed of raindrops.
    • The root systems help water to seep down in the ground.
    • Forests help maintain the flow of water in streams, ensuring a steady water supply.
    • Tree roots bind the soil together, preventing soil erosion during heavy rain.
  3. What are decomposers? Name any two of them. What do they do in the forest?:
    • Decomposers are micro-organisms that convert dead plants and animals into humus.
    • Examples of decomposers include:
      • Mushrooms
      • Certain insects
      • Millipedes
      • Ants
      • Beetles
    • In the forest, decomposers play a vital role by:
      • Converting dead plants and animals to humus.
      • Releasing nutrients into the soil, which are then absorbed by living plants.
  4. Explain the role of forests in maintaining the balance between oxygen and carbon dioxide in the atmosphere:
    • Plants release oxygen through photosynthesis.
    • This oxygen is used by animals for respiration.
    • Plants also absorb carbon dioxide from the atmosphere during photosynthesis.
    • This process helps maintain a balance of oxygen and carbon dioxide in the atmosphere.
  5. Explain why there is no waste in a forest:
    • Dead animals become food for vultures, crows, jackals, and insects.
    • Decomposers convert dead plants and animals into humus, releasing nutrients back into the soil.
    • These nutrients are then absorbed by the roots of living plants.
    • In this way, nutrients are cycled, ensuring nothing goes to waste.
  6. List five products we get from forests:
    • Plywood
    • Fuel wood
    • Paper
    • Gums
    • Medicinal plants
  7. Fill in the blanks:
    • (a) The insects, butterflies, honeybees and birds help flowering plants in seed dispersal.
    • (b) A forest is a purifier of air and water.
    • (c) Herbs form the lowest layer in the forest.
    • (d) The decaying leaves and animal droppings in a forest enrich the soil.
  8. Why should we worry about the conditions and issues related to forests far from us?
    • The source does not directly answer this question. However, it indicates that forests influence climate, the water cycle, and air quality. The source also states that deforestation will endanger our life and environment.
  9. Explain why there is a need for a variety of animals and plants in a forest:
    • A greater variety of plants provides more food and habitat for herbivores.
    • A larger number of herbivores means more food for carnivores.
    • A wide variety of animals helps the forest regenerate and grow.
    • Decomposers help maintain the supply of nutrients to growing plants.
  10. Which of the following is not a forest product?
    • (iv) Kerosene
  11. Which of the following statements is not correct?
    • (ii) Plants and animals in a forest are not dependent on one another.
  12. Micro-organisms act upon the dead plants to produce
    • (iii) Humus

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