Q.5 World's most problematic aquatic weed is
1. Azolla
2. Wolffia
3. Eichhornia
4. Trapa
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyQ.6 Which of the following causes biomagnification?
1.
2. Mercury
3. DDT
4. Both (b) and (C)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe expanded form of DDT is
1. dichloro diphenyl trichloroethane
2. dichloro diethyl trichloroethane
3. dichloro dipyridyl trichloroethane
4. dichloro diphenyl tetrachloroacetate
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe green scum seen in the freshwater bodies is
1. blue-green algae
2. red algae
3. green algae
4. Both (a) and (c)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich one of the following diseases is not due to contamination of water?
1. Hepatitis-B
2. Jaundice
3. Cholera
4. Typhoid
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyNuisance growth of aquatic plants and bloom-forming algae in natural
water is generally due to high concentrations of
1. carbon
2. sulfur
3. calcium
4. phosphorus
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyQ.20 Algal blooms impart a distinct color to water due to
1. their pigments
2. excretion of colored substances
3. formation of colored chemicals in water facilitated by the physiological degradation of algae
4. absorption of light by algal cell wall
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology