Grade-8, SST, Resources

EXERCISES

 

Fill in the blanks with appropriate words.

(a) Leather is a biotic resource. (It comes from living things - animals)

(b) Minerals like iron ore, copper, lead are non-renewable resources.

(c) Abiotic resources come from non-living things.

(d) Minerals that cannot be used because we do not have the technology to exploit them are called potential resources.

(e) Education and skills increase the value of human resources.

 

Choose the correct answer.

(a) The resources derived from living things are called

(i) abiotic resources.

(ii) living resources.

(iif) biotic resources.

(iv) actual resources.

Answer: (iii) biotic resources

 

(b) One of these is not an abiotic resource:

(i) coal.

(ii) petroleum.

(iii) humans.

(iv) iron ore.

Answer: (iii) humans.

 

(c) One of these is not an example of a skilled human resource:

(i) engineer.

(ii) doctor.

(iii) porter.

(iv) journalist.

Answer: (iii) porter (Portering typically requires less specific skills compared to professions like engineering, medicine, or journalism)

 

(d) One of these is not a human-made resource:

(i) Sundarban Delta

(ii) NH1.

(iii) Howrah Bridge.

(iv) Delhi Metro.

Answer: (i) Sundarban Delta

 

(e) The minerals which cannot be extracted because we do not have the technology to do so are an example of

(i) potential resource.

(ii) actual resource.

(iii) abiotic resource.

iv) local resource.

Answer: (i) potential resource

 

3. Match the column.

(a) coal (b) motor car (c) sugar cane (d) doctors (e) water

(i) biotic resource (ii) renewable resource (iii) human-made resource (iv) non-renewable resource (v) human resources

 Answer:

(a) coal - (iv) non-renewable resource

(b) motor car - (iii) human-made resource

(c) sugar cane - (i) biotic resource

(d) doctors - (v) human resources

(e) water - (ii) renewable resource

 

4. Write true or false. Correct the false sentences in your notebook.

(a) Water is a renewable resource.

True - Water is replenished through the water cycle.

(b) Coal is a renewable resource.

False - Coal takes millions of years to form and is considered a non-renewable resource.

(c) Ubiquitous resources are found everywhere.

True - Ubiquitous resources are found everywhere, like air and sunlight.

(d) Potential resources are the resources which can be extracted easily.

False - Potential resources are known to exist but cannot be easily extracted due to technological limitations.

(e) We do not need to conserve resources.

False - Conservation of resources is important to ensure their availability for future generations.

 

5. Answer the following questions in one or two sentences.

 

(a) Name the main types of natural resources that exist on earth.

Answer: The main types of natural resources are biotic (living things), abiotic (non-living things), renewable (replenish), and non-renewable (take millions of years to form).

 

(b) What is a potential resource?

Answer: A potential resource is one known to exist but not currently usable due to technological limitations.

 

(c) What are human-made resources?

Answer: Human-made resources are anything created by humans, like buildings or machinery.

 

(d) What is sustainable development?

Answer: Sustainable development is meeting current needs without harming the ability of future generations to meet theirs.

 

(e) Why is sustainable development important?

Answer: Sustainable development is important because it ensures we meet our current needs without harming the environment or depleting resources. This allows future generations to also meet their needs and have a healthy planet.

 

6. Answer the following questions in four or five sentences.

 

(a) Explain renewable and non-renewable resources with examples.

Answer: Renewable resources can be replenished in a short time, like sunlight, air, and water. They're crucial for long-term use.

Non-renewable resources, like coal, oil, and natural gas, take millions of years to form and have a limited supply. Careful use is essential.

 

(b) Differentiate between ubiquitous and localized resources.

Answer: Ubiquitous resources are found everywhere, like air and sunlight. Localized resources are concentrated in specific areas, like minerals or fertile land. Understanding their distribution helps manage them effectively.

 

(c) What do you understand by an actual resource?

Answer: An actual resource is one we've identified and can currently access with available technology. We know its location and quantity, allowing for informed use. Mineral deposits discovered with accessible mining techniques are an example.

 

(d) Why are human beings considered the most important resource for a country?

Answer: Human beings are a country's most valuable resource because their education, skills, and innovation drive development. They can manage other resources, create new technologies, and find solutions for sustainable practices.

 

(e) Why is conservation of resources important?

Answer: Conservation of resources is vital to ensure their availability for future generations. It promotes responsible use, reduces waste, and encourages practices like recycling to extend the lifespan of existing resources. This helps us meet current needs without compromising the future.