Find the correct order of bio magnification of DDT in an aquatic food chain
a) fish cating bird
b) water
c) zooplankton
d) small fish
e) large fish

Find the correct order of biomagnification of DDT in an aquatic food chain:

Biomagnification of DDT in an aquatic food chain starting from water having a concentration of 0.003 ppb may go, in fish eating birds, upto:

Consider the following statements For osmoregulation in aquatic medium 1. A freshwater fish has to drink water continuously 2. A marine bony fish has to drink water continuously 3. A freshwater fish produces copious urine, which is hypo-osmotic to blood 4. A marine fish produces scanty urine, which is hypo-osmotic to blood Which of the statements given above is/are correct?

Which of the following statements is not correct regarding biomagnification ? (i) Mercury accumulated by an organism cannot be metabolised. (ii) In the process of biomagnification, concentration of DDT is increased at successive trophic levels. (iii) Accumulation of cadmimu can cause thinning of egg shell in birds. (iv) DDT accumulation is a major cause of reduced population of fish eating birds. (v) Biomagnification occurs only in aquatic food chain.

Rewrite the food chain given below in the correct sequence. i. Insect rarr Hawk rarr Snake rarr Frog rarr Grass ii. Birds rarr Zooplanktons rarr Phytoplanktons rarr Small Fishes rarr BigFishes

Phytoplanktons rarr Zooplanktons rarr Small fishes rarr Large fishes rarr Killer whales The population of smalI fishes will increase with