Maharashtra Board Class 5 EVS Part 2 Chapter 3 Life on Earth Solutions

5th Standard EVS 2 Lesson Number 3 Question Answer Life On Earth Maharashtra Board

Std 5 EVS 2 Chapter 3 Question Answer

1. Answer The Following Question In One Sentence.

Question a. What instrument do we need to see a unicellular organism?
Answer: We need a microscope to see a unicellular organism. This tiny device helps us observe things too small for the naked eye.
In simple words: To see very tiny living things, like unicellular organisms, we use a microscope.

🎯 Exam Tip: Remember that a microscope is essential for observing objects that are invisible to the naked eye, such as unicellular organisms.

Answer The Following In Brief

Question a. How were the sun and the planets in our solar system created?
Answer: 1. Around 4-5 million years ago, an enormous cloud of very hot gases and dust was spinning at a great speed in space. This cosmic dance led to the formation of our solar system.
2. Its circular motion and great speed caused its division into several portions.
3. This splitting created the sun and the planets in our solar system.
In simple words: Our solar system began as a fast-spinning cloud of hot gas and dust that broke into pieces, forming the sun and all the planets.

🎯 Exam Tip: When describing cosmic events, use clear chronological steps and key terms like 'enormous cloud,' 'spinning,' and 'division' to explain the process effectively.

Question b. Write any two characteristics of animals.
Answer: 1. Animals move to find food and for other purposes. This ability to move is a fundamental characteristic.
2. Some species of animals lay eggs and their young ones are born out of the egg; whereas animals of some
3. other species give birth to their young ones.
In simple words: Animals can move to find food, and they reproduce either by laying eggs or by giving birth to live young.

🎯 Exam Tip: When asked for characteristics, provide distinct and fundamental traits. For animals, movement and reproduction methods are excellent examples.

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

Question 1.
M E R C U R Y J
M A V S R M A U
V R S E A A R P
E T S U N R N I
N H A N U S V T
U S A T S R N E
S A T U R N P R
N E P T U N E O
Answer: The words found in the grid are:
1. Mercury
2. Jupiter
3. Venus
4. Mars
5. Saturn
6. Neptune
7. Earth
In simple words: This word search puzzle contains the names of seven planets in our solar system, hidden horizontally, vertically, or diagonally within the letter grid.

🎯 Exam Tip: When solving word search puzzles, systematically scan rows, columns, and diagonals for letter patterns that form known words, especially those related to the topic if one is given.

8. Uranus

Question 1. Arrange the events given below in chronological order.
(a) Water bodies appeared on the earth's surface.
(b) The sun and the planets revolving around it were created.
(c) Protozoa appeared in water.
(d) An enormous cloud of hot gases and dust was formed in space.
Answer:
(a) An enormous cloud of hot gases and dust formed in space.
(b) The sun and the planets were formed.
(c) Water bodies appeared on the earth's surface.
(d) Protozoa appeared in water. This sequence shows the gradual development of Earth and life.
In simple words: The Earth's story began with a gas cloud, then the sun and planets formed, followed by water, and finally, the first tiny life forms appeared.

🎯 Exam Tip: When arranging events chronologically, identify the earliest and latest events first, then fill in the steps in between to ensure correct order.

Activity

Question 1. Make a model of the solar system using balls of different sizes.
Answer: To make a model of the solar system, one can use different sized balls or spheres to represent the sun and planets, arranging them in their correct orbital sequence. This hands-on activity helps visualize the scale and arrangement of our celestial neighborhood.
In simple words: Create a solar system model by using various sized balls for the sun and planets, placing them in their correct order.

🎯 Exam Tip: For activity-based questions, describe the steps clearly and mention the purpose or learning outcome of the activity.

Project

Question 1. Visit a zoo or make a list of animals which are seen in your neighbourhood and note their characteristics.
Answer: For this project, one could visit a local zoo to observe various animals and their unique features, or alternatively, list common animals found in the neighborhood like dogs, cats, birds, and insects, noting their physical traits, habits, and habitats. This helps in understanding local biodiversity.
In simple words: Either go to a zoo to see animals and their features, or list animals near your home and describe what they look like and what they do.

🎯 Exam Tip: When describing observations, be specific about physical characteristics, behaviors, and the environment of the animals.

Environmental Studies Part 2 Standard 5th Solutions Chapter 3 Life On Earth Additional Important Questions And Answers

Fill In The Blanks:

Question 1. An enormous' cloud of very hot gases and dust spinning at a great speed was formed in ..........
Answer: space. The formation of the solar system began with a vast cloud of gas and dust, which eventually condensed to form the Sun and planets.
In simple words: Our solar system started as a giant spinning cloud of hot gas and dust in space.

🎯 Exam Tip: Remember that the formation of celestial bodies like planets often begins with the condensation of cosmic dust and gases.

Question 2. The cloud's circular motion and great speed caused it to divide into several portions, creating the .......... and ..........
Answer: Sun and planets. The intense rotation of the primordial cloud led to its fragmentation, giving rise to the central star (Sun) and the orbiting planetary bodies.
In simple words: The fast-spinning cloud broke into pieces, forming the Sun in the middle and planets around it.

🎯 Exam Tip: Understand that rotation and gravitational forces are key factors in the formation of stars and planetary systems.

Question 3. .......... and .......... are planets.
Answer: Mercury and Venus. Mercury and Venus are two of the inner planets in our solar system, known for their distinct characteristics and proximity to the Sun.
In simple words: Mercury and Venus are two of the planets that orbit our Sun.

🎯 Exam Tip: Be able to name the planets in our solar system and recall a basic fact about each.

Question 4. The ....... is the only planet where life is known to exist
Answer: Earth. Earth possesses unique conditions, including liquid water, a suitable atmosphere, and a stable temperature range, which are essential for sustaining life as we know it.
In simple words: Earth is special because it has water, air, and the right temperature for living things to survive.

🎯 Exam Tip: When discussing Earth's uniqueness, always mention the presence of liquid water and a breathable atmosphere as primary reasons for life.

Question 5. After the creation of the earth, it took about .......... years for its surface to cool down and for water bodies to be formed on it.
Answer: 80 crore. The early Earth was a molten body, and its gradual cooling over hundreds of millions of years allowed for the condensation of water vapor into oceans, a crucial step for life.
In simple words: After Earth formed, it took a very long time, about 80 crore years, for it to cool down enough for water to appear on its surface.

🎯 Exam Tip: Remember the vast timescales involved in geological and planetary processes; "crore" is a significant unit of time in this context.

Question 6. It is believed that various kinds of unicellular? organisms or living things, first appeared in ..........
Answer: Water. The oceans provided a stable environment, shielding early life forms from harsh radiation and offering the necessary chemical ingredients for their development.
In simple words: The first tiny living things, called unicellular organisms, are thought to have started in the water.

🎯 Exam Tip: Always associate the origin of early life with water, as it provides a protective and nutrient-rich environment.

Question 7. Unicellular organisms are known as ..........
Answer: Protozoa. Protozoa are a diverse group of single-celled eukaryotic organisms, many of which are motile and feed on other microorganisms or organic matter.
In simple words: Protozoa are tiny living things made of just one cell.

🎯 Exam Tip: Define unicellular organisms as those made of a single cell, and Protozoa is a key example to remember.

Question 8. Gradually, .......... living things developed from these unicellular ones.
Answer: Multi cellular. The evolution from single-celled to multi-celled organisms was a monumental step, allowing for specialization of cells and the development of more complex life forms.
In simple words: Over time, living things with many cells grew from the simple, single-celled organisms.

🎯 Exam Tip: Understand that evolution often progresses from simpler to more complex forms, with multicellularity being a major evolutionary advancement.

Question 9. Protozoa can only be seen through a ..........
Answer: Microscope. Due to their microscopic size, protozoa are invisible to the naked eye, requiring magnification to observe their intricate structures and movements.
In simple words: Protozoa are so small that you need a microscope to see them.

🎯 Exam Tip: Remember that any organism described as "microscopic" or "unicellular" generally requires a microscope for observation.

Question 10. The living world on the Earth consists of ...... and ......
Answer: Plants and animals. The two major kingdoms of life, plants and animals, represent vast diversity in how organisms obtain energy, reproduce, and interact with their environment.
In simple words: All living things on Earth can be broadly divided into plants and animals.

🎯 Exam Tip: When asked about the living world, always categorize it into the fundamental groups like plants and animals.

Question 11. Animals .......... in order to get food or for other purpose.
Answer: Move. Mobility is a defining characteristic of most animals, enabling them to forage for food, escape predators, find mates, and adapt to changing conditions.
In simple words: Animals move around to find food or for other reasons like safety.

🎯 Exam Tip: A key difference between plants and animals is that animals typically exhibit locomotion (movement) for survival.

Question 12. Animals of some species lay eggs. Their young ones are born out of ..........
Answer: Eggs. Oviparous animals, which lay eggs, provide a protective casing for the developing embryo, allowing for external incubation and hatching.
In simple words: Some animals lay eggs, and their babies hatch from these eggs.

🎯 Exam Tip: Distinguish between oviparous (egg-laying) and viviparous (live-bearing) animals when discussing reproduction.

Answer Each Question In One Sentence :

Question 1. When did the formation of the earth begin?
Answer: On the basis of scientific research, it is believed that the formation of earth came into being around 4.5 billion years ago. This long period highlights the immense age of our planet.
In simple words: Scientists believe the Earth started forming about 4.5 billion years ago, based on their research.

🎯 Exam Tip: Remember the approximate age of the Earth (4.5 billion years) as a key fact for questions about its formation.

Question 2. On the onset of creation, what was first formed?
Answer: An enormous cloud of very hot gases and dust spinning at a great speed was formed in space. This initial cloud was the building block for everything that followed.
In simple words: At the very beginning, a huge, fast-spinning cloud of hot gases and dust appeared in space.

🎯 Exam Tip: When describing the beginning of creation, focus on the "enormous cloud of hot gases and dust" as the primary element.

Question 3. How were the sun and planets formed?
Answer: The circular motion of the great cloud caused it to divide into several portions thus creating the sun and planets. Gravity played a crucial role in pulling these portions together.
In simple words: The big spinning cloud broke into smaller parts due to its motion, and these parts eventually formed the Sun and all the planets.

🎯 Exam Tip: Emphasize the "circular motion" and "division into portions" as the mechanism for the formation of celestial bodies.

Question 4. Name the planets in our solar system.
Answer: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune are the planets in our solar system. These eight planets orbit the Sun in distinct paths.
In simple words: The planets in our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

🎯 Exam Tip: List all eight planets in order from the Sun if possible, or simply ensure all are named correctly.

Question 5. What forms the solar system?
Answer: The solar system is formed by the Sun, along with all the planets, their moons, asteroids, comets, and other celestial objects that orbit around it. It is a vast and complex system held together by gravity.
In simple words: The solar system is made up of the Sun, all the planets, their moons, and other space rocks like asteroids and comets, all orbiting the Sun.

🎯 Exam Tip: Remember to include the Sun as the central component, along with planets, moons, and other smaller bodies, when defining the solar system.

Question 6. Which is the only planet where life is known to exist?
Answer: The Earth is the only planet where life is known to exist. This makes Earth unique in our solar system.
In simple words: Earth is the only planet we know of that has life.

🎯 Exam Tip: Remember that Earth's unique conditions, like liquid water and a suitable atmosphere, are key to supporting life.

Question 7. How many years did it take for the surface of the Earth to get cooled?
Answer: After the creation of the Earth, it took about 80 crore years for its surface to cool down and for water bodies to be formed on it. This long cooling period was essential for the planet's habitability.
In simple words: It took about 80 crore years for Earth's surface to cool down enough for water to form.

🎯 Exam Tip: When answering questions about geological time, try to recall the approximate timeframes mentioned, such as "80 crore years" for Earth's cooling.

Question 8. What kind of living organisms appeared first? What are they known as?
Answer: Various kinds of unicellular organisms or living things first appeared in water, they are known as 'Protozoa'. These simple life forms were the pioneers of life on Earth.
In simple words: The first living things were tiny, single-celled organisms in water, called Protozoa.

🎯 Exam Tip: Remember the term 'unicellular' for single-celled organisms and 'Protozoa' as their specific name when they first appeared.

Question 9. When did the multicellular living organisms appear?
Answer: After the creation of unicellular organisms in water, gradually, multicellular living organisms developed from the unicellular ones. This was a significant step in the evolution of life.
In simple words: Multicellular organisms slowly developed from the earlier unicellular organisms that lived in water.

🎯 Exam Tip: Understand the sequence of life's evolution: unicellular organisms first, then multicellular organisms evolving from them.

Question 10. State the main characteristics of animals in which young ones are born.
Answer: Animals of some species lay eggs and their young ones are born out of an egg. While in some other species, a mother gives birth to their young ones. This diversity in reproduction strategies is a key aspect of animal life.
In simple words: Some animals lay eggs from which babies hatch, while others give birth to live young.

🎯 Exam Tip: When describing animal characteristics, always mention both egg-laying and live-bearing methods of reproduction if applicable, as both are common.

Question 11. Which planets revolve around the sun?
Answer: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune are the planets that revolve around the sun. These celestial bodies follow elliptical paths around our star.
In simple words: The planets that go around the sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

🎯 Exam Tip: Remember the order of the planets from the sun to help recall them all for such questions.

Question 15. How many years ago was the cloud formed in space?
Answer: The cloud was formed in space about 4-5 billion years ago, marking an early stage in the formation of our solar system.
In simple words: The cloud in space that formed our solar system appeared around 4 to 5 billion years ago.

🎯 Exam Tip: Pay attention to the scale of time (billions of years) when discussing cosmic events.

Answer The Following Questions In Brief:

Question 1. How did life develop on Earth? Or What was the origin of life on earth?
Answer:1. After the creation of the Earth, it took about 80 crore years for its surface to cool down and for water bodies to be formed on it. 2. Various kinds of unicellular organisms known as protozoa, first appeared in water. 3. Gradually, multicellular living things developed from these unicellular ones. 4. Thus, life developed on Earth, evolving from simple forms to complex organisms over vast periods.
In simple words: After Earth cooled and water formed, tiny single-celled life appeared in the water. These then slowly grew into more complex, multi-celled living things, leading to all life we see today.

🎯 Exam Tip: When explaining a process like the origin of life, break it down into sequential steps for clarity and completeness.

Glossary:

1. enormous : very large
2. unicellular : consisting of one cell
3. organism : an individual animal, plant or single-called life form

Class 5 Environmental Studies Questions And Answers: