What are green skills? Class-9 Unit-5 Ch-1:

CBSE Solution-2025-26

Unit-5 Green Skills-I

Chapter-1 Environment

A. Fill in the blanks

Q1. ______ is composed of biotic factors of a community of living organisms interacting with one another which we can see in food chains.

Ans: Ecosystem

Q2. Improper disposal is one of the reasons why synthetic products become problems and causes of ______.

Ans: Pollution

Q3. ______ of natural resources for example soil disintegration, deforestation, consumption of natural life and exhaustion of minerals.

Ans: Depletion

Q4. ______ is a branch of science that studies about the relationship between biotic and abiotic.

Ans: Ecology

Q5. An economy that aims at reducing environmental risk and ecological crises and that aims for sustainable development without degrading the environment is called ______.

Ans: Green Economy

B. True or False

Q1. Overloading the land with compost, overgrazing and moving agriculture leads to siltation in major rivers and reservoirs.

Ans: True

Q2. Wastes can be decomposed by decomposers.

Ans: True

Q3. Green technology and environmentally friendly technology is developed and used in a way that protects the environment and conserves natural resources.

Ans: True

Q4. Removal of predators in the ecosystem such that declining their number in a very low proportion does not interfere in the balance of interaction with any food web.

Ans: False

Q5. Biosphere is the Earth’s zone of air, water and soil that has the capability in supporting life.

Ans: True

C. Choose the correct answer

Q1. What is the best way to resolve and combat ecological imbalance?

(A) Using scientific measures

(B) Using movements

(D) All of these

Ans: (D) All of these

Q2. Which of the following are examples of natural disturbances?

(A) Volcanic eruptions

(B) Floods

(D) Cutting off trees

Ans: (A), (B), (C)

Q3. Which of the following are examples that cause disturbance due to human activities?

(A) The introduction of a new species

(B) Logging forest

(D) Overhunting of a species

(E) All of these

Ans: (E) All of these

Q4. Stage of waste management that transforms waste again into a raw material that can be made into a new item:

(A) Recycle

(B) Reuse

(D) Reduce

Ans: (A) Recycle

Q5. This process makes Earth much warmer than it would be without an atmosphere:

(A) Abiotic

(B) Biotic

(D) Waste management

Ans: (C) Greenhouse effect

D. Short Answer Questions

Q1. Define the terms:

a.Ecosystem

b.Ecology

c.Green Economy

Ans:

Ecosystem – A community of living organisms interacting with each other and their physical environment.

Ecology – The branch of science that studies the relationship between organisms and their environment.

Green Economy – An economy that promotes sustainable development while reducing environmental risks and ecological imbalances.

Q2. Briefly describe the various factors that influence the environment.

Ans: Natural factors such as climate, soil, water, flora, and fauna, and human factors such as deforestation, industrialization, urbanization, pollution, and overuse of resources influence the environment.

Q3. List the ways you can conserve natural resources.

Ans: Planting trees, reducing pollution, recycling and reusing, sustainable farming, water conservation, and using renewable energy.

Q4. Differentiate between non-renewable and renewable resources.

Ans:

Renewable resources can be replenished naturally (e.g., sunlight, wind, water, forests).

Non-renewable resources are limited and cannot be replaced once used (e.g., coal, petroleum, minerals).

E. Long Answer Questions

Q1. Describe the relationship between abiotic and biotic things.

Ans: Biotic factors (plants, animals, microbes) depend on abiotic factors (soil, air, water, light, temperature) for survival. Abiotic factors influence growth, reproduction, and distribution of organisms, while biotic factors modify their environment (e.g., plants releasing oxygen).

Q2. What is the importance of Green Economy?

Ans: Green economy promotes sustainable development, reduces pollution, ensures efficient use of resources, creates green jobs, conserves biodiversity, and improves human well-being without degrading the environment.

Q3. Explain the 4R’s of waste management.

Ans:

Reduce – Minimize waste generation.

Reuse – Use products multiple times.

Recycle – Convert waste into raw materials for new products.

Recover/Refuse – Extract energy/materials from waste or avoid unnecessary consumption.

Q4. How is climate change damaging the Earth?

Ans: Climate change causes rising global temperatures, melting glaciers, sea-level rise, extreme weather events, desertification, biodiversity loss, decline in agriculture, and health problems.

Q5. List and describe how some human activities are damaging the Earth and environment.

Ans:

Deforestation – Loss of biodiversity and soil erosion.

Industrialization – Air, water, and soil pollution.

Urbanization – Habitat destruction and overuse of resources.

Overexploitation – Overfishing, mining, excessive groundwater use.

Pollution – Plastic waste, greenhouse gases, toxic chemicals harming ecosystems.

SOME OTHER LINKS:

CBSE INFORMATION TECHNOLOGY-UNIT-I-CLASS-9(CHAPTER-1)

CBSE INFORMATION TECHNOLOGY-UNIT-I-CLASS-9(CHAPTER-2)

CBSE INFORMATION TECHNOLOGY-UNIT-I-CLASS-9(CHAPTER-3)

CBSE INFORMATION TECHNOLOGY-UNIT-I-CLASS-9(CHAPTER-4)