Chapter 4
The Motions of the Earth
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. On 22nd December, the sun rays are vertical at the-
Answer: vacuole
- 2. Which statement about a leap year is incorrect?
Answer: vacuole
- 3. If there is noon on one side of the earth, the opposite side will have-
Answer: vacuole
- 4. On 23rd September, mid-day sun is overhead at the-
Answer: vacuole
- 5. The angle of sun rays on 21st June on the Tropic of Cancer is-
Answer: vacuole
B. Fill in the blanks.
- 1. The earth revolves around the sun in a fixed path called as ___________.
- 2. The angle of inclination of the earth’s axis is ___________ with its orbital plane.
- 3. Two motions of the earth are ___________ and ___________.
- 4. The time period immediate before sunrise is called ___________.
- 5. The earth completes one revolution around the sun in ___________ days and ___________ hours.
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 is rotation? How much time does earth take in completing one rotation?
Answer: Sharing of chores reduces the burden.
- 2. What is meant by the revolution of the earth?
Answer: The older family member pass on the family traditions to the younger generation.
- 3. What is a leap year?
Answer: There is more interaction between parents and children in nuclear families.
- 4. What is an equinox? Which seasons are indicated by it in both the hemispheres?
Answer: A surname is a family name.
- 5. Why does the duration of day and night change in a year?
Answer: A surname is a family name.
E. Answer the following questions.
- 1. Why are days and nights equal on 21st March at all places on the earth? Explain.
Answer: The (main) factors that determine the shape of a cell are location and function.
- 2. Explain with the help of a diagram, why seasons are reversed between Northern and Southern Hemispheres.
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. Why does the month of February have 29 days, after every four years? Explain.he Northern Plains.
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. How do day and night occur on the earth? Explain 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.
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