Name and define the environment related terms:
(a) DDT accumulated in a three step food chain will be maximum in secondary consumer.
(b) Pertaining to causing algal bloom.

Observe figure and answer the following questions. (i) The ecological term used to describe the DDT accumulation at different troohic levels ? (ii) List any one effect of DDT accumulation on birds. (iii) Will DDT accumulation lead to eutrophication ? (iv) Does it affect the BOD? (v) Name disease caused by accumulation of any heavy metal.

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.

Define the following terms and give two examples in each case. (a) Autotrophs (b) Consumers (c) Food chain (d) Symbiosis (e) Parasitism (f) Predation

Physical and chemical equilibria can respond to a change in their pressure, temperature, and concentration of reactants and products. To describe the change in the equilibrium, we have a principle named Le Chatelier's principle. This we can define in terms of energy, as the free energy change in equilibrium is zero means the system is stable. So if we are doing some changes in equilibrium, then the system having a tendency to reestablish the equilibrium by undoing the effect we brought. Consider the following equilibrium. Three sparingly soluble salts A_(2)B, AB , and AB_(3) are given. If all the three having the same value of solubility products (K_(sp)) , in the saturated solution, the correct order of their solubilites is