CBSE Important Questions

Q. 1. Observe the given picture carefully and answer to the given questions-

1. Name two biotic and two abiotic components of the ecosystems given in this picture. [1]
2. Name two herbivores seen in the picture. [1/2]
3. Write a three step food chain using the organisms seen in the picture. [1]
4. Make a four step food chain with the snake at one of the trophic levels. [1]
5. Tell the trophic level of the encircled organism. [1/2]
6. Write about the Type of food eaten and the category to which the encircled organism belongs. [1]
7. Write about the percentage of energy available at each trophic level in your three step food chain if the energy at the first trophic level is 2200KJ.[2]
8. Which is the ultimate source of energy in the given picture? What is the percentage of energy obtained from this source is used by the green plants? [1]
9. Name two ecosystems visible in this picture. [1]
10. Define a food web.[1]
11. Is it possible to have food chains working in isolation in the nature? Why? [2]

Q. 2. Observe the given picture carefully and answer to the given questions-

1. Name all the abiotic components of the ecosystems given in this picture. [1]
2. Name two carnivores seen in the picture. [1/2]
3. Write a three step food chain using the aquatic organisms seen in the picture. [1]
4. Make a four step food chain with the terrestrial organisms seen in this picture. [1]
5. Tell the trophic level of the encircled organisms. [1]
6. Write about the type of food eaten and the category to which the encircled organism belongs. [1]
7. Write about the percentage of energy available at each trophic level in your four step food chain if the energy at the second trophic level is 200KJ.[11/2]
8. Why is it not possible to have more than six trophic levels in a food chain? [1]
9. Which organism –one at the third trophic level and another at the fourth trophic level- will have more energy and why? [2]
10. Name an organism from the picture which belongs to the following category-
    -Producers
    -Primary consumers
    -Secondary consumers
    -Tertiary consumers. [2]
    
11. Draw a pyramid of numbers for a food chain representing the above mentioned categories. [2]