3. Life on Earth | EVS II | Class 5

The blog discusses the Questions and Answers from the lesson 3, Life on Earth, Environmental Science, Part 2, from Class 5. Students can use these answers for reference in their studies.

Q1. Answer each question in one sentence.

1. Which instrument do we need to see a unicellular organism ?

Ans. To see a unicellular organism we need a instrument called microscope.

2. Where did the protozoa appear first ?

Ans. The protozoa appeared first in water.

Q2. Answer the following questions in brief.

1. How were the sun and planets in our solar system created ?

Ans. On the basis of scientific research it is believed that the following events led to the formation of sun and planets in our solar system :
(a) Around 4-5 million years ago, an enormous cloud of very hot gases and dust spinning at a very high speed was formed in space.
(b) Its circular motion and great speed caused its division into several portions thus creating the sun and the planets which revolve around the sun.

2. Write any two characteristics of animals ?

Ans. The following are some of the main characteristics of animals :
(a) Animals breathe.
(b) Animals move to find food or for other purposes.
(c) Animals of some species lay eggs and their young ones are born out of it, while animals of some other species give birth to their young ones.

Q3. Find the names of planets in the box.

Ans.

Q4. Arrange the events given below in chronological order :

1. Water bodies appeared on the earth’s surface.

2. The sun and the other planets were formed.

3. Protozoa appeared in water.

4. An enormous cloud of hot gases and dust formed in space.

Ans. The correct chronological order is as follows :

1. An enormous cloud of hot gases and dust formed in space.

2. The sun and the other planets were formed.

3. Water bodies appeared on the earth’s surface.

4.Protozoa appeared in water.

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