Free PDF Download of CBSE Class 10 Science Chapter 15 Our Environment Assertion Reason Questions for Class 10 Science. Assertion and Reason Question for Class 10 Science with Answers were Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 10 Science Our Environment to know their preparation level.
Our Environment Class 10 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions 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 community.
Reason :ecosystem is community of different organisms that interact with each other and surroundings
(a) Both A and R are true and R is the correct explanation of A.
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