4. Evolution | EVS II | Class 5

The blog discusses the Questions and Answers from the lesson 4, Evolution, Environmental Science, Part 2, from Class 5. Students can use these answers for reference in their studies.

Q1. Fill in the blanks.

1. The first systematic explanation of the concept of evolution was given by Charles Darwin. (Charles Darwin, Willard Libby, Louis Leakey).

2. Mammals are the most evolved animals among vertebrates. (Aquatic animals, Amphibians, Mammals)

Q2. Answer each question in one sentence.

1. What do we call animals which live in water and also on land ?

Ans. The animals which live in water and also on land are called as Amphibians.

2. Where did the first humans appear ?

Ans. The first humans appeared on the African Continent.

Q3. Give reasons for the following.

1. The species of dinosaurs, which were enormous in size, suddenly became extinct.

Ans. The dinosaurs which were enormous in size, suddenly became extinct because :
(a) According to Charles Darwin’s theory, the species that cannot adapt to its environmental changes cannot survive and becomes extinct in the process of evolution.
(b) It is also believed that some sudden natural disaster or environmental change occurred causing extinction of enormous dinosaurs.

2. In the course of time, a new species with characteristics different from the original species is created.

Ans. A new species with characteristics different from the original species is created because of the following reasons :
(a) In the process of survival by adapting to environmental changes, certain internal physical changes occur in some animals of a species.
(b) Over a period of time, these internal changes become inherited characteristics seen in all following generations.
Thus a new species with characteristics different from the original is created.

Q4. Fill in the blanks with the concept chart given below :

Ans.

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