Question

Fill up the blanks -

A. I disposal into a water without proper treatment may cause outbreak of serious diseases, such as, dysentery, typhoid, jaundice, cholera, etc.

B. High concentrations of I disturb II metabolism in birds, which causes thinning of eggshell and their premature breaking, eventually causing decline in bird populations.

C. Without greenhouse effect the average temperature at surface of Earth would have been a chilly I rather than the present average of 15⁰C.

D. Presence of large amounts of nutrient in waters also causes excessive growth of free-floating I, called an II bloom which imparts a distinct colour to the water bodies. III cause deterioration of the water quality and fish mortality. Some bloom-forming algae are extremely toxic to human beings and animals.

• A. A – I – Sewage; B – I – DDT, II – Calcium; C – I - – 18⁰C, II; D – I – phytoplanktons, II – algal, III – Algal blooms
• B. A – I – DDT; B – I – Sewage, II – calcium; C – I - – 18⁰C, II; D – I – planktons, II – algal, III – Algal blooms
• C. A – I – Sewage; B – I – DDT, II – fat; C – I - – 18⁰C, II; D – I – planktons, II – algal, III – Algal blooms
• D. A – I – Sewage; B – I –DDT, II – calcium; C – I - – 180⁰C, II – D – I – zooplanktons, II – animal, III – Zoo blooms

Answer 1

Answer: (A)

A – I – Sewage; B – I – DDT, II – Calcium; C – I - – 18⁰C, II; D – I – phytoplanktons, II – algal, III – Algal blooms