Std 5 EVS 2 · Chapter 3

3. Life on Earth

Complete textbook exercise solutions — Maharashtra State Board (Balbharati), Grade Five Environmental Studies Part 2.

1Answer each question in one sentence.

(a) What instrument do we need to see a unicellular organism?
We need a microscope to see a unicellular organism.

(b) Where did the protozoa appear first?
It is believed that protozoa (unicellular organisms) appeared first in water.

2Answer the following in brief.

(a) How were the sun and the planets in our solar system created?
Around 4.5 billion years ago, an enormous cloud of very hot gases and dust spinning at a great speed was formed in space. Its circular motion and great speed caused it to divide into several portions, thus creating the sun and the planets which revolve around the sun.

(b) Write any two characteristics of animals.
Two main characteristics of animals are:
1. Animals breathe.
2. Animals move in order to get food or for other purposes.

3Find the names of the planets in the box below.

The names of the planets hidden in the given word grid are:

MERCURY VENUS EARTH MARS JUPITER SATURN URANUS NEPTUNE

4Arrange the events given below in chronological order.

The correct chronological order of the events is:

1. (d) An enormous cloud of hot gases and dust was formed in space.

2. (b) The sun and the planets revolving around it were created.

3. (a) Water bodies appeared on the earth's surface.

4. (c) Protozoa appeared in water.

★Activity & Project

Activity: Make a model of the solar system using balls of different sizes.
Project: Visit a zoo or make a list of animals which are seen in your neighbourhood and note their characteristics.
(Students are expected to complete these creative and observation-based tasks on their own.)

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