Forests: Our Lifeline class 7 | worksheet & printable
Forests: Our Lifeline. Download Forests: Our Lifeline class 7 worksheet based on the latest CBSE syllabus including MCQ questions, long questions type, important notes on the forest are our lifeline, define the following, fill in the blanks questions, answer in one word, and more based on NCERT syllabus.
Points to remember ( notes)
Forest is an area with large numbers of trees that serves as a natural habitat for animals and plants. Some of the famous forests in the world are spiny forests, Madagascar, Sikkim pine forest (India), The amazon rainforest, South America, and more.
Afforestation is the planting of trees over a large region where deforestation has taken place.
An ecosystem is a biological environment that includes all the living and non-living components of a particular area.
branchy part of a tree above the stem is known as the crown. trees had crowns of different types and sizes. These had created different horizontal layers in the forest. These are known as understoreys Giant and tall trees constituted the top layer followed by shrubs and tall grasses, and herbs formed the lowest layer.
The branches of the tall trees look like a roof over the other plants in the forest is called a canopy
All animals, whether herbivores or carnivores depend ultimately on plants for food. Organisms that feed on plants often get eaten by other organisms, and so on. For example, the grass is eaten by insects, which in turn, is taken by the frog. The frog is consumed by snakes. This is said to form a food chain: Grass- insects- frog- snake- eagle. Many food chains can be found in the forest. All food chains are linked. If one food chain is disturbed, it affects any other food chain. Every part of the forest is dependent on the other parts. If we remove one component, say trees, all other components would be affected.
The micro-organisms which convert the dead plants and animals to humus are known as decomposers. These micro-organisms play an important role in the forest.
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. They are a source of medicinal plants, timber, and many other useful products. If forests disappear, the amount of carbon dioxide in the air will increase, resulting in an increase in the earth’s temperature.