Chapter 6
Life on 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. Which one of the following is a threat to ecological balance?
Answer: vacuole
- 2. Taiga is-
Answer: vacuole
- 3. For the preservation of varied plant and animal life, the government has set up various-
Answer: vacuole
- 4. Mosses and lichens are-
Answer: vacuole
- 5. The temperate grasslands of North America are called the-
Answer: vacuole
B. Fill in the blanks.
- 1. The first form of life on the earth appeared in the ___________ belonging to flora world.
- 2. The living zone of the planet earth is known as ___________.
- 3. The human beings, who first appeared on the earth, were known as ___________.
- 4. The Taiga vegetation is also known as ___________._____ land.
- 5. The plants prepare their own food and are known as ___________ of the biosphere.
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. Name the major types of vegetation of the world.
Answer: Sharing of chores reduces the burden.
- 2. Name some common plants found in cold and hot desert regions of the world.
Answer: The older family member pass on the family traditions to the younger generation.
- 3. What are the major components of Ecosystem?
Answer: There is more interaction between parents and children in nuclear families.
- 4. Give some examples of trees having needle-shaped leaves.
Answer: A surname is a family name.
- 5. Why do animals in the polar region have thick fur on their bodies?
Answer: A surname is a family name.
E. Answer the following questions.
- 1. Why are equatorial forests known as evergreen forests? Give a few examples of trees found there.
Answer: The (main) factors that determine the shape of a cell are location and function.
- 2. What role do plants play in ecological balance?
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. Distinguish between tropical and temperate grasslands.
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. Differentiate between hot and cold deserts.
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. What are the various problems related to the ecological imbalance? What steps should we take to solve them?
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