NCERT Solutions for Class 7 Geography Chapter 1 Environment contains answers to the exercise questions given in the “Our Environment”. All the answers provided here are accurate and simple that will help you understand the concepts easily and continue your studies without a doubt. These solutions will also help you to score higher marks with the help of well-illustrated answers.
Class 7 Geography Chapter 1 Environment Questions and Answers
Question 1: Answer the following questions.
(i) What is an ecosystem?
Answer: The system formed by the interaction of all living organisms with each other and with the physical and chemical factors of the environment in which they live, all linked by the transfer of energy and material is called an ecosystem.
(ii) What do you mean by natural environment?
Answer: The environment that consists of all objects created by nature is called the natural environment. The natural environment comprises land, water, air, plants and animals.
(iii) Which are the major components of the environment?
Answer: The major components of the environment are:
- Natural environment (consists of all objects created by nature)
- Human environment (consists of human population)
- Human-made environment (consists of objects created by human beings).
(iv) Give four examples of a human-made environment.
Answer: Four examples of the human-made environment are buildings, parks, industries and bridges.
(v) What is lithosphere?
Answer: The solid crust or the hard top layer of the earth is called the lithosphere. It is made up of rocks and minerals and is covered by a thin layer of soil. It is an irregular surface with various landforms like mountains, plateaus, plains, valleys, etc.
(vi) Which are the two major components of the biotic environment?
Answer: Plants and animals are the two major components of the biotic environment.
(vii) What is biosphere?
Answer: Biosphere or the living world is the narrow zone of earth where land, water and air interact with each other to support life. The plant and animal kingdom together form the biosphere.
Question 2: Tick the correct Answer.
(i) Which is not a natural ecosystem?
(a) Desert
(b) Aquarium
(c) Forest
Answer: (b) Aquarium
(ii) Which is not a component of human environment?
(a) Land
(b) Religion
(c) Community
Answer: (a) Land
(iii) Which is a human made environment?
(a) Mountain
(b) Sea
(c) Road
Answer: (c) Road
(iv) Which is a threat to environment?
(a) Growing plant
(b) Growing population
(c) Growing crops
Answer: (b) Growing population
Question 3: Match the following:
| (i) Biosphere | (a) blanket of air which surrounds the earth |
| (ii) Atmosphere | (b) domain of water |
| (iii) Hydrosphere | (c) gravitational force of the earth |
| (iv) Environment | (d) our surroundings |
| (e) narrow zone where the land water and the air interacts | |
| (f) relation between the organisms and their surroundings |
Answer:
| (i) Biosphere | (e) narrow zone where the land water and the air interacts |
| (ii) Atmosphere | (a) blanket of air which surrounds the earth |
| (iii) Hydrosphere | (b) domain of water |
| (iv) Environment | (d) our surroundings |
Question 4: Give reasons.
(i) Man modifies his environment
Answer: Man modifies his environment to fulfill his basic needs, as it is the basic life support system. He builds houses to live in and industries to work in which modifies the environment and also its mineral wealth. Humans have used the fossils for their own development, disturbing the ecological system and animal habitats.
(ii) Plants and animals depend on each other
Answer: Plants and animals depend on each other for their sustainability. For example, plants are the producers and animals are the consumers. Plants The plants also produce oxygen through the process of photosynthesis which is inhaled by humans and animals. On the other hand, humans and animals give out carbon dioxide gas through their respiration which is used by the plants in producing their own food.