Our Environment Class 3 Worksheet Science

Q1: Multiple Choice Questions (MCQs)

(i) What is the definition of an ecosystem?
(a) A community of interdependent living organisms and their environment
(b) The total amount of water on Earth
(c) The hard outer layer of the Earth
(d) The thin layer of air around the Earth
Ans: (a)
An ecosystem is a community of interdependent living organisms and their interaction with the environment in a specific area.

(ii) Which component of the environment provides resources like minerals and landforms?
(a) Atmosphere
(b) Hydrosphere
(c) Lithosphere
(d) Biosphere
Ans: (c)
The lithosphere provides resources like minerals and landforms.

(iii) What is the largest component of the Earth?
(a) Lithosphere
(b) Hydrosphere
(c) Atmosphere
(d) Biosphere
Ans: (b)
The hydrosphere, which includes all the water on Earth, is the largest component.

(iv) Which of the following is a human-made component of the environment?
(a) Mountains
(b) Rivers
(c) Roads
(d) Oceans
Ans: (c)
Roads are an example of a human-made component of the environment.

Q2: Fill in the Blanks

(i) The biological environment is also known as the ______.
Ans: Biosphere.

(ii) The Earth's outermost layer, made up of rock, is called ______.
Ans: Lithosphere.

(iii) The total amount of water on Earth is known as the ______.
Ans: Hydrosphere.

(iv) An ecosystem is a system formed by a community of ______ living organisms found in a place, and their interaction with the environment.
Ans: Interdependent.

(v) The atmosphere helps control the ______ on Earth.
Ans: Temperature.

Q3: Match the Column (In a Table)

Ans:

Q4: True or False

(i) The hydrosphere provides living beings with water, which is essential for life.
Ans: True.
The hydrosphere is crucial for providing water, which is essential for life.

(ii) The physical environment consists of the lithosphere, hydrosphere, and biosphere.
Ans: False.
The physical environment consists of the lithosphere, hydrosphere, and atmosphere.

(iii) Humans primarily adapt themselves to the environment, rather than changing it.
Ans: False.
Humans change the environment to suit their needs.

(iv) An ecosystem is a static, unchanging system.
Ans: False.
An ecosystem is a dynamic system where interactions among organisms and their environment continually occur.

(v) The socio-cultural environment includes factors like family, religion, and education.
Ans: True.
The socio-cultural environment encompasses family, religion, education, and other social and cultural aspects.