Balbharti Maharashtra State Board Class 5 Environmental Studies Solutions Chapter 4 Evolution Notes, Textbook Exercise Important Questions and Answers.
5th Std EVS 2 Digest Chapter 4 Evolution Textbook Questions and Answers
1. Fill in the blank.
Question a.
The first systematic explanation of the concept of evolution was given by ………………… .
Charles Darwin
Willard Libby
Louis Leakey
Answer:
The first systematic explanation of the concept of evolution was given by Charles Darwin.
Question b.
……………… are the most evolved animals among vertebrates
Aquatic animals
Amphibians
Mammals
Answer:
Mammals are the most evolved animals among vertebrates
2. Answer the question in one sentence.
What do we call animals which live in water and also on land?
Answer:
Amphibians live in water and also on land.
Where did the first humans appear?
Answer:
The first human appeared on the African continent.
3. Give reasons for the following:
Question a.
The species of dinosaurs, which were enormous in size, suddenly became extinct.
Answer:
The species of dinosaurs, which were enormous in size, suddenly became extinct, because –
1. According to Darwin, the species that cannot adapt to environmental changes become extinct in the process of evolution.
2. Some sudden natural disaster or environmental change is believed to be responsible for the extinction of enormous dinosaurs.
Question b.
In the course of time, a new species with characteristics different from the original species is created.
Answer:
In the process of survival by adapting to environmental changes, certain internal physical changes occur in some species of animals.
Over a period of time, these changes become inherited characteristics seen in all subsequent generations. Thus, in the course of time, a new species with characteristics different from the original species is created.
4. Fill in the blanks in the concept chart given below.
Question 1.
Fill in the blanks in the concept chart given below.
Answer:
Activity :
Question 1.
Make a model of a dinosaur.
Project :
Queston 1.
Collect pictures of invertebrates and vertebrates. Stick them in a notebook and write down their characteristics.
Environmental Studies Part 2 Standard 5th Solutions Chapter 4 Evolution Additional Important Questions and Answers
Fill in the blanks :
Answer:
Match the columns :
Question 1.
| Column ‘A’ | Column ‘B’ |
| 1. Charles Darwin | a. a gradual and continuous change |
| 2. Evolution | b. means ‘terrible lizard’ |
| 3. Dinosaur | c. gradually evolved into plants and animals |
| 4. Multicellular | d. explained the concept of evolution |
| 5. Invertebrates | e. frogs |
| 6. Aquatic | f. snake |
| 7. Amphibians | g. cow |
| 8. Reptiles | h. snails |
| 9. Mammals | i. fish |
Answer:
| Column ‘A’ | Column ‘B’ |
| 1. Charles Darwin | d. explained the concept of evolution |
| 2. Evolution | a. a gradual and continuous change |
| 3. Dinosaur | b. means ‘terrible lizard’ |
| 4. Multicellular | c. gradually evolved into plants and animals |
| 5. Invertebrates | e. frogs |
| 6. Aquatic | i. fish |
| 7. Amphibians | e. frogs |
| 8. Reptiles | f. snake |
| 9. Mammals | g. cow |
Answer each question in one sentence:
Question 1.
What does evolution mean?
Answer:
Evolution means a gradual and continuous change
Question 2.
What changes occur in some species, during the process of survival?
Answer:
In the process of survival, by adapting to environmental changes, certain internal physical changes occur in some animals of a species.
Question 3.
What happens to the internal changes over a period of time?
Answer:
Over a period of time, these internal changes become inherited characteristics seen in all generations.
Question 4.
When does an original species become extinct?
Answer:
During evolution, a new species with characteristics different from the original may be created. Sometimes the original species becomes extinct.
Question 5.
Name the scientist who explained the concept of evolution.
Answer:
The first scientist to give us a systematic explanation of the concept of evolution was Charles Darwin
Question 6.
Which species are able to survive?
Answer:
Species which are capable of adapting to environmental changes are able to survive.
Question 7.
Which species become extinct in the process of evolution?
Answer:
The species that cannot adapt to environmental changes become extinct in the process of evolution
Question 8.
What does dinosaur mean?
Answer:
Dinosaur means a ‘terrible lizard’.
Question 9.
How did the dinosaurs suddenly become extinct?
Answer:
Some sudden natural disaster or environmental change is believed to be responsible for the extinction of dinosaurs.
Question 10.
Why do we suppose that some species of dinosaurs have evolved into birds?
Answer:
Fossils of dinosaurs with wings have been discovered. Hence, it is supposed that some species of two-legged and winged dinosaurs evolved into birds.
Question 11.
How did plants and animals come into being?
Answer:
Unicellular organisms gave rise to multicellular organisms which in turn gradually evolved into various classes of plants and animals.
Question 12.
What are invertebrates?
Answer:
Animals without a backbone are called ‘invertebrates’. For example: a snail.
Question 13.
What are vertebrates?
Answer:
Animals which have a backbone are called vertebrates. For example: A cow
Question 14.
What do we call animals which live in water and also on land?
Answer:
Animals which live in water and also on land are called ‘Amphibians’. For example: Frog
Question 15.
What are Aquatic animals?
Answer:
Living organisms that live only in water are called ‘Aquatic animals’. For example Fish
Question 16.
What are Reptiles?
Answer:
Animals which crawl are called Reptiles. For example: Snake
Question 17.
Which species are the most evolved animals among vertebrates?
Answer:
Mammals are the most evolved animals among vertebrates.
Question 18.
Where do apes mostly live?
Answer:
Apes mostly lived on trees.
Question 19.
How did the Human species evolve?
Answer:
Some ape species found in grasslands were forced to move around on ground. These species evolved gradually and in time gave rise to human species.
Question 20.
What is the first human species called?
Answer:
The first human species is called the ‘primitive man’.
Question 21.
What does primitive mean?
Answer:
‘Primitive’ means ‘the first’.
Question 22.
Who are Apes?
Answer:
Apes are somewhat like humans in appearance.
Give reasons for the following :
Question 1.
In the course of time, a new species with characteristics different from the original species is created. Answer:
Question 2.
A frog is an amphibian.
Answer:
Question 3.
The platypus and some species of anteaters are considered mammals.
Answer:
Answer the following questions in brief :
Question 1.
Explain the concept Evolution as stated by Charles Darwin.
Answer:
Question 2.
Give the characteristics of mammals.
Answer:
The characteristics of most of the mammals are as follows:
Question 3.
How and where did the human species evolve?
Answer:
Question 4.
How did various classes of plants and animals come into being?
Answer:
Question 5.
How did birds form from dinosaurs?
Answer:
Question 6.
How many and which are the stages of evolution of animals?
Answer:
There are two stages of evolution of animals. They are:
Glossary :