Ecosystem
- Consider the following statements concerning food chains
(1) removal of 80% tigers from an area resulted in greatly increased growth of vegetation
(2) removal of most of the carnivores resulted in an increased population of deers
(3) the length of food chains is generally limited to 3-4 trophic levels due to energy loss
(4) the length of food chains may vary from 2 to 8 trophic levels
Which two of the above statements are correct?
-
View Hint View Answer Discuss in Forum
Food chain is the transfer of energy from green plants (Primary producers), through a sequence of organisms occupies in a food chain is known as its trophic level. Therefore, statements b and c are correct.
Correct Option: A
Food chain is the transfer of energy from green plants (Primary producers), through a sequence of organisms occupies in a food chain is known as its trophic level. Therefore, statements b and c are correct.
- Which one of the following is not used for construction of ecological pyramids?
-
View Hint View Answer Discuss in Forum
Fresh weight is not used for the construction of ecological pyramids because the total fresh weight does not change into energy. Hence we can say that fresh weight is not continuous in the tropic levels.
Correct Option: C
Fresh weight is not used for the construction of ecological pyramids because the total fresh weight does not change into energy. Hence we can say that fresh weight is not continuous in the tropic levels.
- An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having
-
View Hint View Answer Discuss in Forum
An ecosystem having low stability can be easily damaged. An ecosystem having high resilience will take less time to recover.
Correct Option: A
An ecosystem having low stability can be easily damaged. An ecosystem having high resilience will take less time to recover.
- Bamboo plant is growing in a fir forest then what will be the trophic level of it?
-
View Hint View Answer Discuss in Forum
First trophic level is occupied by producers. Second trophic level is occupied by primary consumers. Third trophic level is occupied by the secondary consumers.
Correct Option: A
First trophic level is occupied by producers. Second trophic level is occupied by primary consumers. Third trophic level is occupied by the secondary consumers.
- The transfer of energy from one trophic level to another is governed by the 2nd law of thermodynamics. The average efficiency of energy transfer from herbivores to carnivores is
-
View Hint View Answer Discuss in Forum
According to the 10% law, at each trophic level, only 10% of the energy received is transfered to the next trophic level.
Correct Option: B
According to the 10% law, at each trophic level, only 10% of the energy received is transfered to the next trophic level.
