Table of Contents
Forests – Our Lifeline worksheet will help you learn about the important role forests play in our world. As you go through the questions and activities, you will discover the different layers of a forest, the various plants and animals that live there, and how they all depend on each other.
Forests are amazing places full of life. They cover about one-third of the Earth’s land and are home to many different types of plants and animals. Forests help us breathe by taking in carbon dioxide and giving out oxygen. They also help keep our climate stable, manage the water cycle, and prevent soil from being washed away.
In a forest, there are different layers. At the top is the emergent layer with the tallest trees. Below that is the canopy, where many animals live. The next layer is the understorey, which has smaller trees and plants. At the bottom is the forest floor, where you find soil and decomposing leaves. Each layer is important and supports different types of life.
Also Check: NCERT Solutions for Class 7 Science Chapter 17 Forest: Our Life Line
Forests are not just homes for wildlife; they also provide us with food, medicine, and materials like wood. It’s important to protect forests from being cut down too much, which is called deforestation. Planting new trees, known as afforestation, helps to keep our forests healthy.
This worksheet will teach you about the structure of forests, the creatures that live there, and why forests are so important. Let’s start our journey to understand why forests are truly our lifeline!
Forest Our Lifeline Class 7 Science Worksheet: Fill in the Blanks
Ques. ____________________ is a system comprising various plants, animals and micro-organisms.
Answer: Forest
Ques. In a forest, ___________________ forms the uppermost layer followed by shrubs.
Answer: trees
Ques. Forests are the______________________ for the forest dwelling communities.
Answer: lifeline
Ques. Forest_____________________________ is dark in color due to the presence of humus.
Answer: floor
Ques. Wide variety of animals help ____________________ to grow & regenerate.
Answer: Forest
Ques. ________________________convert the dead plants and animals to humus.
Answer: Decomposer
Ques. ______ is the branch of forestry that deals with the development and care of forest.
Answer: Silviculture
Ques. Variety of plants found in particular area is known as _____
Answer: flora
Ques. Variety of animals found in particular area is known as ______
Answer: fauna
Ques. Forest serve as__________________________ and water purifying system in nature.
Answer: Green lungs
Forest Our Lifeline Class 7 Science Worksheet: True or False
Ques. Forests protect the soil from erosion.
Answer: True
Ques. Plants and animals in a forest are not dependent on one another.
Answer: False
Ques. Forests influence the climate and water cycle.
Answer: True
Ques. Soil helps forests to grow and regenerate.
Answer: True
Also Check: CBSE Class 7 Science Nutrition in Animals Worksheets
Forest Our Lifeline Class 7 Science Worksheet: Very Short Answer Type Questions
Ques. Which terms is used for celebration of planting of saplings on a large scale?
Answer: Van Mahotsav
Ques. What do we call to the branched part of a tree above the stem?
Answer: Crown
Ques. Name the sequence of living organisms in which one eats another.
Answer: Food chain
Ques. What name is given to the different horizontal layers created by different types and sizes of trees?
Answer: Understoreys
Which part of the forest helps in recharging of the ground water?
Answer: Forest floor
Ques. Name the term used for cutting of trees at large scale.
Answer: Deforestation
Ques. Name the practice of planting trees to save the environment from the bad effects of deforestation.
Answer: Afforestation
Ques. How much land area on the earth is covered with forest?
Answer: Approximately one-third
Ques. What is an ecosystem?
Answer: Living beings and their environment together form an ecosystem.
Ques. What is afforestation?
Answer: Large scale planting of tree saplings is called Afforestation.
Ques. What causes global warming?
Answer: Due to deforestation and pollution, the greenhouse effect increases, causing a gradual increase in the earth’s average temperature. This is known as global warming.
Also Check: Chemistry Worksheets Class 7 on Chapter 5 Acids, Bases and Salts with Answers
Forest Our Lifeline Class 7 Science Worksheet: Short Answer Type Questions
Ques. In terms of food chain, discuss the interdependence of plants and animals.
Answer: Plants produce food by photosynthesis, this food is used by herbivores. Carnivores eat herbivores and make the food chain. Animals and decomposers provide nutrients to plants.
Ques. How do forests help in conservation of soil?
Answer: Roots of plants hold the soil and prevent soil erosion. Forests also make the soil nutrient-rich.
Ques. Give two examples which show that plants depend on animals.
Answer:
- Plants use carbon dioxide gas for photosynthesis, exhaled by animals.
- Animals help expand forests by aiding in pollination and seed dispersal.
Ques. Explain how forests prevent floods?
Answer: Plants in the forests do not allow rainwater to fall directly on the earth. These plants also hold water, which helps in preventing floods.
Ques. List five products we get from forests.
Answer:
i) Medicines
ii) Spices
iii) Wood
iv) Paper
v) Gum
Forest Our Lifeline Class 7 Science Worksheet: Long Answer Type Questions
Ques. What is deforestation? Explain various causes responsible for deforestation.
Answer: The large scale felling or cutting of trees is known as deforestation. Causes include:
- Increased demand for fuel-wood, wood for paper, and timber.
- Increased demand for land for industries, houses, roads, etc.
- Overgrazing by cattle and sheep.
- Increased mining activity.
- Forest fires.
Ques. Enlist various uses of forests.
Answer: Uses of forests:
- Forests prevent soil erosion and floods.
- We get fuel-wood, wood for paper, and timber from forests.
- Forests help to bring rains.
- Forests balance the amount of oxygen and carbon dioxide gases in the atmosphere.
- Forests check global warming.
- We get many products like medicines, spices, resins, latex, etc., from forests.
Ques. Describe how animals depend on plants.
Answer:
- Animals get food from plants.
- Animals get oxygen gas for respiration from the atmosphere, which is released by plants in photosynthesis.
- Animals get shelter under trees.
- Many predators capture their prey by hiding in trees.
Ques. What measures can be taken for the conservation of forests?
Answer:
- Use of wood as fuel should be discouraged.
- Cutting of trees for other purposes should be matched with planting more trees.
- Forest fires should be controlled.
- Overgrazing and illegal cutting should be controlled.
- Steps should be taken for planting trees on a large scale, i.e., afforestation.
Also Check: CBSE Class 7 Science Soil Worksheets
Class 7 Science Forest Our Lifeline Worksheet: Multiple Choice Questions
Ques. Which of the following is not a forest product?
a) Plywood
b) Sealing wax
c) Kerosene
d) Gum
Answer: c) Kerosene
Ques. A food chain includes:
a) Producers and Herbivores
b) Producers and Carnivores
c) Producers and Decomposers
d) Producers, Herbivores and Carnivores
Answer: d) Producers, Herbivores and Carnivores
Ques. Bacteria and fungi act as:
a) Decomposers
b) Herbivores
c) Omnivores
d) Carnivores
Answer: a) Decomposers
Ques. Microorganisms act upon the dead organisms to produce:
a) Humus
b) Wood
c) Sand
d) All of these
Answer: a) Humus
Class 7 Science Forest Our Lifeline Worksheet: Additional Questions
Ques. What is known as the crown of the tree?
Answer: Branchy part of a tree above the stem is known as the crown of the tree.
Ques. What is a canopy?
Answer: Branches of the tall trees look like a roof over the other plants in the forest. This is called a canopy.
Ques. List five products we get from forests.
Answer: Gum, oils, spices, fodder for animals, and medicinal plants are some of the products we get from forests.
Ques. What are known as understoreys in forests?
Answer: Trees have crowns of different types and sizes. These create different horizontal layers in the forest. These are known as understoreys.
Ques. What is the effect of deforestation on soil?
Answer: Roots of trees normally bind the soil together, but in their absence, the soil is washed away or eroded.
Ques. In which layer of the soil would you find humus? What is its importance to the soil?
Answer: Humus is found in the top, organic layer of soil. Humus provides many useful nutrients to the soil.
Ques. Why does the forest floor seem to be dark-coloured?
Answer: The forest floor seems to be dark-coloured as it is covered with a layer of dead and decaying leaves, fruits, seeds, twigs, and small herbs. The decaying matter is moist and warm.
Ques. Who would have planted trees in the forest?
Answer: In nature, trees produce enough seeds. The forest floor provides favorable conditions for them to germinate and develop into seedlings and saplings. Some grow up into trees.
Also Check: CBSE Class 7 Science Chapter 15 Light MCQ Questions with Answers
Ques. Why even after heavy rainfall does water not stagnate in the forest?
Answer: Forests act as a natural absorber of rainwater and allow 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 streams so that we get a steady supply of water.
Ques. Why are forests called green lungs?
Answer: Plants release oxygen through the process of photosynthesis. 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 green lungs.
Ques. Why do raindrops not hit the forest floor directly?
Answer: The uppermost layer of the forest canopy intercepts the flow of raindrops, and most of the water comes down through the branches and the stems of the trees. From the leaves, it drips slowly over branches of the shrubs and herbs. Thus, raindrops do not hit the forest floor directly.
Ques. Why are forests disappearing?
Answer: Forests are disappearing due to:
- Construction of roads, buildings, industrial development, and increasing demand for wood.
- Overgrazing of animals and indiscriminate felling of trees for agricultural land.
Ques. What happens if an animal dies in the forest?
Answer: Dead animals become food for vultures, crows, jackals, and insects.
