Free PDF Download of CBSE Class 10 Science Chapter 15 Our Environment Assertion Reason Questions Class 10 Science. Assertion and Reason Questions for Class 10 Science with Answers were Prepared Based on the Latest Exam Pattern. Students can solve NCERT Class 10 Science Our Environment to know their preparation level.
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Our Environment Class 10 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Q.1. Assertion: Polythene bags and plastic containers are non-biodegradable substances.
Reason: They can be broken down by microorganisms in natural simple harmless substances.
(c) A is true but R is false.
Q.2. Assertion: The concentration of harmful chemicals is least in human beings.
Reason: Man is at the apex of the food chain.
(d) Assertion is false but reason is true
Q.3. Assertion: Ozone is formed in upper atmosphere by O2 in presence of UV radiations.
Reason: Ozone depletion will lead to UV rays reaching earth which may cause skin cancer.
(b) Both A and R are true but R is not the correct explanation of A.
Q.4. Assertion: Aquarium needs regular cleaning
Reason: There are no microbes to clean water in aquarium, therefore, it needs to be regularly cleaned.
(a) Both A and R are true and R is the correct explanation of A.
Q.5.Assertion :food ensures survival of all trophic levels.
Reason : phytoplanktons are primary consumers.
(b) Both A and R are true but R is not the correct explanation of A.
Q.6.Assertion : The various components of an ecosystem are interdependent
Reason: food chain and web are formed due to linkage in organisms .
(a) Both A and R are true and R is the correct explanation of A.
Q.7.Assertion :Each step in a food chain is called a trophic level.
Reason :Trophic levels are formed by both plants and animals.
(a) Both A and R are true and R is the correct explanation of A.
Q.8.Assertion :food web consists of only producers.
Reason :specific enzymes are required for breakdown of substances in environment.
(d) Assertion is false but reason is true
Q.9.Assertion :The function of consumers is to convert organic compound into inorganic compound.
Reason :Green plants are called the producers.
(d) Assertion is false but reason is true
Q.10.Assertion: An ecosystem is made of different types of communities.
Reason: An ecosystem is a community of different organisms that interact with each other and their surroundings
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Air pollution can lead to respiratory problems in humans.
Reason (R): Polluted air contains harmful pollutants that can irritate and damage the respiratory system.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Biodiversity is important for maintaining the balance of ecosystems.
Reason (R): Biodiversity refers to the variety of living organisms in an area and their interactions with each other and the environment.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Ozone layer depletion is a cause for concern.
Reason (R): The ozone layer protects the Earth from harmful ultraviolet (UV) radiation.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Deforestation contributes to climate change.
Reason (R): Trees absorb carbon dioxide and release oxygen, helping to regulate the Earth’s climate.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Eutrophication of water bodies can lead to the death of aquatic organisms.
Reason (R): Eutrophication is the excessive growth of algae and other plants in water bodies due to increased nutrient levels.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Renewable sources of energy are more sustainable and environmentally friendly.
Reason (R): Renewable energy sources, such as solar and wind energy, do not deplete natural resources and have minimal environmental impact.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Soil erosion can lead to the loss of fertile topsoil.
Reason (R): Soil erosion is the process of wearing away the topsoil by natural factors like wind and water.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Greenhouse gases trap heat in the Earth’s atmosphere.
Reason (R): Greenhouse gases, such as carbon dioxide and methane, absorb and re-emit infrared radiation, leading to global warming.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Noise pollution can have harmful effects on human health.
Reason (R): Prolonged exposure to high levels of noise can cause stress, hearing loss, and other health problems.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Waste management is essential for maintaining a clean and healthy environment.
Reason (R): Proper waste management involves the collection, treatment, and disposal of waste materials to prevent pollution and health hazards.
(a) Both A and R are true and R is the correct explanation of A.
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