345360
Algal blooms impart a distinct colour to water due to:
1 Their pigments
2 Excretion of coloured substances
3 Formation of coloured chemicals in water facilitated by physiological degradation of algae.
4 Absorption of light by algal cell wall.
Explanation:
Algal blooms impart a distinct colour to water due to their pigments such as green, red and brown.
NCERT Exemplar
BIOXII16: ENVIRONMENTAL ISSUES
345361
The highest biomagnification of DDT is seen in
1 Aquatic weed
2 Herbivorous fish
3 Carnivorous fish
4 Fish eating bird
Explanation:
The highest biomagnification of DDT is seen in fish eating bird
BIOXII16: ENVIRONMENTAL ISSUES
345362
The expanded form of DDT is:
1 Dichloro diphenyl trichloroethane
2 Dichloro diethyl trichloroethane
3 Dichloro dipyrydyl trichloroethane
4 Dichloro diphenyl tetrachloroacetate
Explanation:
Dichloro diphenyl trichloroethane.
NCERT Exemplar
BIOXII16: ENVIRONMENTAL ISSUES
345363
High value of BOD (Biochemical Oxygen demand) indicates that
1 Water is highly polluted
2 Water is less polluted
3 Consumption of organic matter in the water is higher by the microbes
4 Water is pure
Explanation:
\({\rm{BOD}}\) (Biochemical Oxygen Demand) is a method which measures the level of water pollution. The polluted water has bacteria and many other microorganisms which consume the dissolved oxygen of water. The higher the \({\rm{BOD}}\), the lower would be the dissolved oxygen in polluted water. The high value of \({\rm{BOD}}\) indicates the highly polluted water.
345360
Algal blooms impart a distinct colour to water due to:
1 Their pigments
2 Excretion of coloured substances
3 Formation of coloured chemicals in water facilitated by physiological degradation of algae.
4 Absorption of light by algal cell wall.
Explanation:
Algal blooms impart a distinct colour to water due to their pigments such as green, red and brown.
NCERT Exemplar
BIOXII16: ENVIRONMENTAL ISSUES
345361
The highest biomagnification of DDT is seen in
1 Aquatic weed
2 Herbivorous fish
3 Carnivorous fish
4 Fish eating bird
Explanation:
The highest biomagnification of DDT is seen in fish eating bird
BIOXII16: ENVIRONMENTAL ISSUES
345362
The expanded form of DDT is:
1 Dichloro diphenyl trichloroethane
2 Dichloro diethyl trichloroethane
3 Dichloro dipyrydyl trichloroethane
4 Dichloro diphenyl tetrachloroacetate
Explanation:
Dichloro diphenyl trichloroethane.
NCERT Exemplar
BIOXII16: ENVIRONMENTAL ISSUES
345363
High value of BOD (Biochemical Oxygen demand) indicates that
1 Water is highly polluted
2 Water is less polluted
3 Consumption of organic matter in the water is higher by the microbes
4 Water is pure
Explanation:
\({\rm{BOD}}\) (Biochemical Oxygen Demand) is a method which measures the level of water pollution. The polluted water has bacteria and many other microorganisms which consume the dissolved oxygen of water. The higher the \({\rm{BOD}}\), the lower would be the dissolved oxygen in polluted water. The high value of \({\rm{BOD}}\) indicates the highly polluted water.
345360
Algal blooms impart a distinct colour to water due to:
1 Their pigments
2 Excretion of coloured substances
3 Formation of coloured chemicals in water facilitated by physiological degradation of algae.
4 Absorption of light by algal cell wall.
Explanation:
Algal blooms impart a distinct colour to water due to their pigments such as green, red and brown.
NCERT Exemplar
BIOXII16: ENVIRONMENTAL ISSUES
345361
The highest biomagnification of DDT is seen in
1 Aquatic weed
2 Herbivorous fish
3 Carnivorous fish
4 Fish eating bird
Explanation:
The highest biomagnification of DDT is seen in fish eating bird
BIOXII16: ENVIRONMENTAL ISSUES
345362
The expanded form of DDT is:
1 Dichloro diphenyl trichloroethane
2 Dichloro diethyl trichloroethane
3 Dichloro dipyrydyl trichloroethane
4 Dichloro diphenyl tetrachloroacetate
Explanation:
Dichloro diphenyl trichloroethane.
NCERT Exemplar
BIOXII16: ENVIRONMENTAL ISSUES
345363
High value of BOD (Biochemical Oxygen demand) indicates that
1 Water is highly polluted
2 Water is less polluted
3 Consumption of organic matter in the water is higher by the microbes
4 Water is pure
Explanation:
\({\rm{BOD}}\) (Biochemical Oxygen Demand) is a method which measures the level of water pollution. The polluted water has bacteria and many other microorganisms which consume the dissolved oxygen of water. The higher the \({\rm{BOD}}\), the lower would be the dissolved oxygen in polluted water. The high value of \({\rm{BOD}}\) indicates the highly polluted water.
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BIOXII16: ENVIRONMENTAL ISSUES
345360
Algal blooms impart a distinct colour to water due to:
1 Their pigments
2 Excretion of coloured substances
3 Formation of coloured chemicals in water facilitated by physiological degradation of algae.
4 Absorption of light by algal cell wall.
Explanation:
Algal blooms impart a distinct colour to water due to their pigments such as green, red and brown.
NCERT Exemplar
BIOXII16: ENVIRONMENTAL ISSUES
345361
The highest biomagnification of DDT is seen in
1 Aquatic weed
2 Herbivorous fish
3 Carnivorous fish
4 Fish eating bird
Explanation:
The highest biomagnification of DDT is seen in fish eating bird
BIOXII16: ENVIRONMENTAL ISSUES
345362
The expanded form of DDT is:
1 Dichloro diphenyl trichloroethane
2 Dichloro diethyl trichloroethane
3 Dichloro dipyrydyl trichloroethane
4 Dichloro diphenyl tetrachloroacetate
Explanation:
Dichloro diphenyl trichloroethane.
NCERT Exemplar
BIOXII16: ENVIRONMENTAL ISSUES
345363
High value of BOD (Biochemical Oxygen demand) indicates that
1 Water is highly polluted
2 Water is less polluted
3 Consumption of organic matter in the water is higher by the microbes
4 Water is pure
Explanation:
\({\rm{BOD}}\) (Biochemical Oxygen Demand) is a method which measures the level of water pollution. The polluted water has bacteria and many other microorganisms which consume the dissolved oxygen of water. The higher the \({\rm{BOD}}\), the lower would be the dissolved oxygen in polluted water. The high value of \({\rm{BOD}}\) indicates the highly polluted water.
