Environmental Science - Study Mode
[#841] Trichodermaharzianum has proved a useful microorganism for
Correct Answer
(B) bioremediation of contaminated soils
Explanation
Solution: Trichoderma harzianum has proved a useful microorganism for bioremediation of contaminated soils.
[#842] The occurrence of pesticides like DDT in higher trophic levels is termed as
Correct Answer
(B) biomagnification
Explanation
Solution: Biomagnification, also known as bioamplification or biological magnification, is any concentration of a toxin, such as pesticides, in the tissues of tolerant organisms at successively higher levels in a food chain.
[#843] The study of food chains and food webs is observed in the phenomenon known as
Correct Answer
(B) ecosystem
Explanation
Solution: Food webs consist of many interconnected food chains and are more realistic representation of consumption relationships in ecosystems.
[#844] BOD stands for
Correct Answer
(C) Biological Oxygen Demand
Explanation
Solution: BOD stands for Biological Oxygen Demand. It is the amount of dissolved oxygen required by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.
[#845] Trophic levels are formed by
Correct Answer
(D) Organisms linked in food chain
Explanation
Solution: Trophic levels in a food chain are formed by producers, consumers and decomposers. In the given food chain, plants are producers. The animals eating plants are called as primary consumers and animals eating primary consumers are called as secondary consumers.