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Lessons
- Chapter 1 – Nutrients in plants
- Chapter 2 – Nutrition in Animals
- Chapter 3 – Fibre to Fabric
- Chapter 4 – Heat
- Chapter 5 – Acids bases and salts
- Chapter 6 – Physical and Chemical Changes
- Chapter 7 – Weather, Climate and Adaptations of Animals to Climate
- Chapter 8 – Winds, Storms and Cyclone
- Chapter 9 – Soil
- Chapter 10 – Respiration in Organisms
- Chapter 11 – Transportation in Animals and Plants
- Chapter 12 – Reproduction in Plants
- Chapter 13 – Motion and Time
- Chapter 14 – Electric Current and its Effects
- Chapter 15 – Light
- Chapter 16 – Water: A Precious Resource
- Chapter 17 – Forests: Our Lifeline
- Chapter 18 – Waste water Story
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Question Bank
- Question Bank – Chapter 1 – Nutrients in Plants
- Question Bank – Chapter 2 – Nutrition in Animals
- Question Bank – Chapter 3 – Fibre to Fabric
- Question Bank – Chapter 4 – Heat
- Question Bank – Chapter 5 – Acids, Bases and Salts
- Question Bank – Chapter 6 – Physical & Chemical Changes
- Question Bank – Chapter 7 – Weather, Climate & Adaptations of Animals to Climate
- Question Bank – Chapter 8 – Winds, Storms and Cyclones
- Question Bank – Chapter 9 – Soil
- Question Bank – Chapter 10 – Respiration in Organisms
- Question Bank – Chapter 11 – Transportation in Animals and Plants
- Question Bank – Chapter 12 – Reproduction in Plants
- Question Bank – Chapter 13 – Motion and Time
- Question Bank – Chapter 14 – Electric Current & Its Effects
- Question Bank – Chapter 15 – Light
- Question Bank – Chapter 16 – Water: A Precious Resoure
- Question Bank – Chatper 17 – Forest: Our Life Line
- Question Bank – Chapter 18 – Waste Water Story
Chapter 17 – Forests: Our Lifeline
Chapter 17
Forests: Our Lifeline
- Forest provides a home for many animals and plants.
- Several other trees, shrubs, herbs and grasses are found in the forest.
- The trees were also covered with different types of creepers and climbers
- The forest floor provides favorable conditions for seeds to germinate and develop into seedlings
- The branches of the tall trees look like a roof over the other plants in the forest, it is called a canopy.
- Branchy part of a tree above the stem is known as the crown of the tree they are of different types and sizes.
- These had created different horizontal layers in the forest.
- Giant and tall trees constituted the top layer followed by shrubs and tall grasses, and herbs formed the lowest layer.
- Every part of the forest is dependent on the other parts.
- If one component is removed all other components would be affected.
- The plants help to provide oxygen for animal respiration.
- They also maintain the balance of oxygen and carbon dioxide in the atmosphere.
- That is why forests are called lungs.
- Micro-organisms eat .the dead plant and animal tissues and convert them into a dark coloured substance called humus.
- The micro-organisms which convert the dead plants and animals to humus are known as decomposers, nutrients of the dead plants and animals are released into the soil.
- Dead animals become food for vultures, crows, jackals and insects.
- The decaying animal dung also provides nutrients to the seedlings to grow.
- In this way, the nutrients are cycled. So, nothing goes waste in a forest
- Trees take in water from their roots and release water vapour into the air through evaporation.
- Many people also live in the forest.
- Some of them may belong to different tribes. Depend mostly on the forests.
- The forest provides them with food, shelter, water and medicines.
- Larger number of herbivores means increased availability of food for a variety of carnivores.
- The wide variety of animals helps the forest to regenerate and grow.
- Decomposers help in maintaining the supply of nutrients to the growing plants in the forest.
- Therefore, the forest is a ‘dynamic living entity’ full of life and vitality.”
- The forest also acts as a natural absorber of rainwater and allows it to seep. It helps maintain the water table throughout the year.
- Forests not only help in controlling floods but also help maintain the flow of water in the streams so that we get a steady supply of water.,
- If trees are not present, rain hits the ground directly and may flood the area around it.
- Heavy rain may also damages the soil.
- Roots of trees normally bind the soil together, but in their absence the soil is washed away or eroded.
- Forests provide us with oxygen.
- They protect soil and provide habitat to a large number of animals.
- Forests help in bringing good rainfall in neighboring areas.
- We get various products from the forests surrounding us.
- Forest is a system comprising various plants, animals and micro-organisms.
- In a forest, trees form the uppermost layer, followed by shrubs.
- The herbs form the lowest layer of vegetation.
- Different layers of vegetation provide food and shelter for animals, birds and insects.
- The various components of the forest are interdependent on one another.
- The forest keeps on growing and changing, and can regenerate.
- In the forest, there is interaction between soil, water, air and living organisms.
- Forests protect the soil from erosion.
- Soil helps forests to grow and regenerate.
- Forests are the lifeline for the forest-dwelling communities.
- Forests influence climate, water cycle and air quality.
- Cutting of these forests is called as deforestation
- The effects of deforestation are very large, such as