Chapter 1
The Planet Earth and the Solar System
Highlights
- A. Tick the correct option
- B. Fill in the blanks
- C. Match the following
- D. Correct the following sentences
- E. Answers the following questions
EXERCISE
A. Tick the Correct Option
- 1. What do we call a huge cluster of billions of stars?
Answer: vacuole
- 2. Which one of the following is the hottest planet?
Answer: vacuole
- 3. Which is the most distant planet from the Sun?
Answer: vacuole
- 4. The planet which does not have any satellite is-
Answer: vacuole
- 5. Which planet has two satellites?
Answer: vacuole
B. Fill in the blanks.
- 1. The vast limitless space which includes all celestial bodies is called ___________.
- 2. The distance between celestial bodies is measured in a unit called ___________.
- 3. ___________ always indicates the north direction.
- 4. All the planets of our solar system revolve round the Sun in their fixed paths called ___________.
- 5. ___________ is the third nearest planet to the Sun.
C. Match the following :
- Column A
- 1. Golgi Complex
- 2. Ribosomes
- 3. Chromosomes
- 4. Dead cells
- 5. Photosynthesis
- Column B
- (a) genes
- (b) cork
- (c) chloroplasts
- (d) packaging center
- (e) protein synthesis
D. Answer the following questions in brief.
- 1. What are celestial bodies?
Answer: Sharing of chores reduces the burden.
- 2. Why do stars look very small in the sky?
Answer: The older family member pass on the family traditions to the younger generation.
- 3. What is ‘Saptarishi Mandal’?
Answer: There is more interaction between parents and children in nuclear families.
- 4. Name the planets which are gaseous bodies.
Answer: A surname is a family name.
- 5. Which planet is the closest to Neptune?
Answer: A surname is a family name.
E. Answer the following questions.
- 1. Describe the formation of solar system.
Answer: The (main) factors that determine the shape of a cell are location and function.
- 2. State three features which make the earth a unique planet.
Answer: Distinguish between unicellular and multicellular organisms are
Unicellular organisms are made up of a single cell. e.g., Euglena and Amoeba.
Multicellular organisms are made up of many cells. e.g., Humans and Birds.
- 3. Mention three main characteristics of a satellite.
Answer: All organisms are made up of cells. A cell is capable of independent existence. Due to this, cell is called the structural and functional unit of life.
- 4. Give a brief description on the Phases of Moon with the help of a diagram.
Answer: Mitochondria is known as the Powerhouse of the cell.
Mitochondria are the site of cellular respiration. Energy is produced during this process. Due to this, mitochondria are called the Powerhouse of the cell.
- 5. Write a short note on the other celestial bodies (asteroids, meteoroids and comets) in the solar system.
Answer: All organisms are made up of cells. A cell is capable of independent existence. Due to this, cell is called the structural and functional unit of life.
Related Topics
- Chapter 1 The Cell – Its Structure and Functions
- Chapter 2 Microorganisms: Friends or Foes
- Chapter 3 Metals and Non-Metals
- Chapter 4 Force and Pressure
- Chapter 5 Friction
- Chapter 6 Sources of Energy
- Chapter 7 Combustion
- Chapter 8 Conservation of Plants and Animals
- Chapter 9 Crop Production and Its Management
- Chapter 10 Refraction and Dispersion of Light
- Chapter 11 The Human Eye
- Chapter 12 Sound
- Chapter 13 Synthetic Fibres and Plastics
- Chapter 14 Reproduction in Animals
- Chapter 15 Reaching the Age of Adolescence
- Chapter 16 Electric Current and Its Chemical Effects
- Chapter 17 Stars and Solar System
- Chapter 18 Earthquakes
- Chapter 19 Pollution of Air
- Chapter 20 Pollution of Water