Class 10 Our Environment Previous Years Questions

Previous Years Questions Notes

Our Environment Previous Years Questions

1. Choose the option giving correct matching the item given in Column I & II.
   
   a. A : (iii), B : (i), C : (iv), D : (ii)
   b. A : (iii), B : (iv), C : (i), D : (ii)
   c. A : (iii), B : (iv), C : (ii), D : (i)
   d. A : (iii), B : (i), C : (ii), D : (iv)  [CBSE 2023] [1 Marks]
2. Study the given figure of a food web and identify the primary consumer in the food web :
   
   a. Mice and Bear
   b. Rabbit and Cat
   c. Rabbit and Fox
   d. Mice and Rabbit  [CBSE 2023] [1 Marks]
3. Assertion (A) : The energy which passes to the herbivores does not come back to autotrophs.
   Reason (R) : The flow of energy in a food chain is unidirectional.
   Answer the question selecting appropriate options given below :
   a. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of (A).
   b. Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of (A).
   c. Assertion (A) is true, but Reason (R) is false.
   d. Assertion (A) is false, but Reason (R) is true. [1 mark] [CBSE 2023]
4. Assertion (A) : An ecosystem consist of biotic components and abiotic components.
   Reason (R) : Biotic and abiotic components play important roles for the sustenance of life and work independently in all ecosystem.
   Answer the question selecting appropriate options given below :
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of (A).
   b. Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of (A).
   c. Assertion (A) is true, but Reason (R) is false.
   d. Assertion (A) is false, but Reason (R) is true. [1 mark] [CBSE 2023]
5. 1. Write the percentage of (i) solar energy captured by the autotrophs and (ii) energy transferred from autotrophs to the next level in a food chain.
   2. What are trophic levels ? Why do different food chains in a ecosystem not have more than four to five trophic levels ? Give reasons. [3 mark] [CBSE 2023]
6. If a harmful chemicals enters in a food chain comperising peacock, plants, rats and snakes, which of these organism is likely to have the highest cocentration of the chemical in its body. Justify your answer. Name the process involved and define it. [3 mark] [CBSE 2023]