344886
Statement A : Once covering more than 6 per cent of the earth's land surface, tropical rain forests now cover no more than 4 per cent. Statement B : The Amazon rain forest is called the 'lungs of the planet'.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Statement B is correct and statement A is wrong. Once covering more than 14 per cent of the earth's land surface, tropical rain forests now cover no more than 6 per cent.
BIOXII15: BIODIVERSITY AND CONSERVATION
344887
The extinction of passenger pigeon was due to:
1 Increased number of predatory birds.
2 Over exploitation by humans.
3 Non-availability of the food.
4 Bird flu virus infection.
Explanation:
Passenger pigeons were native birds to North America. They become extinct due to excessive hunting.
NCERT Exemplar
BIOXII15: BIODIVERSITY AND CONSERVATION
344888
What percentage of all living species will go extinct within next 20 to 50 years from human activities, if steps are not taken to conserve species?
1 \(1-2 \%\)
2 \(5-10 \%\)
3 \(10-25 \%\)
4 \(50-75 \%\)
Explanation:
Around \(10-20 \%\) of all living species will go extinct within the next 20 to 50 years from human activities, if steps are not taken to conserve species.
BIOXII15: BIODIVERSITY AND CONSERVATION
344889
Identify the incorrect statements
1 Accelerated rates of sps. extinctions in the world is largely due to human activities.
2 Loss of biodiversity on earth leads to increased survival rate of individuals.
3 More than \(25 \%\) of the drugs available in the market are derived from plants.
4 The importance of key stone sps for proper functioning of ecosystem was explained by Paul Ehrlich.
Explanation:
Loss of bio diversity on earth leads to increased survival rate of individuals- this is a wrong statement.
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BIOXII15: BIODIVERSITY AND CONSERVATION
344886
Statement A : Once covering more than 6 per cent of the earth's land surface, tropical rain forests now cover no more than 4 per cent. Statement B : The Amazon rain forest is called the 'lungs of the planet'.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Statement B is correct and statement A is wrong. Once covering more than 14 per cent of the earth's land surface, tropical rain forests now cover no more than 6 per cent.
BIOXII15: BIODIVERSITY AND CONSERVATION
344887
The extinction of passenger pigeon was due to:
1 Increased number of predatory birds.
2 Over exploitation by humans.
3 Non-availability of the food.
4 Bird flu virus infection.
Explanation:
Passenger pigeons were native birds to North America. They become extinct due to excessive hunting.
NCERT Exemplar
BIOXII15: BIODIVERSITY AND CONSERVATION
344888
What percentage of all living species will go extinct within next 20 to 50 years from human activities, if steps are not taken to conserve species?
1 \(1-2 \%\)
2 \(5-10 \%\)
3 \(10-25 \%\)
4 \(50-75 \%\)
Explanation:
Around \(10-20 \%\) of all living species will go extinct within the next 20 to 50 years from human activities, if steps are not taken to conserve species.
BIOXII15: BIODIVERSITY AND CONSERVATION
344889
Identify the incorrect statements
1 Accelerated rates of sps. extinctions in the world is largely due to human activities.
2 Loss of biodiversity on earth leads to increased survival rate of individuals.
3 More than \(25 \%\) of the drugs available in the market are derived from plants.
4 The importance of key stone sps for proper functioning of ecosystem was explained by Paul Ehrlich.
Explanation:
Loss of bio diversity on earth leads to increased survival rate of individuals- this is a wrong statement.
344886
Statement A : Once covering more than 6 per cent of the earth's land surface, tropical rain forests now cover no more than 4 per cent. Statement B : The Amazon rain forest is called the 'lungs of the planet'.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Statement B is correct and statement A is wrong. Once covering more than 14 per cent of the earth's land surface, tropical rain forests now cover no more than 6 per cent.
BIOXII15: BIODIVERSITY AND CONSERVATION
344887
The extinction of passenger pigeon was due to:
1 Increased number of predatory birds.
2 Over exploitation by humans.
3 Non-availability of the food.
4 Bird flu virus infection.
Explanation:
Passenger pigeons were native birds to North America. They become extinct due to excessive hunting.
NCERT Exemplar
BIOXII15: BIODIVERSITY AND CONSERVATION
344888
What percentage of all living species will go extinct within next 20 to 50 years from human activities, if steps are not taken to conserve species?
1 \(1-2 \%\)
2 \(5-10 \%\)
3 \(10-25 \%\)
4 \(50-75 \%\)
Explanation:
Around \(10-20 \%\) of all living species will go extinct within the next 20 to 50 years from human activities, if steps are not taken to conserve species.
BIOXII15: BIODIVERSITY AND CONSERVATION
344889
Identify the incorrect statements
1 Accelerated rates of sps. extinctions in the world is largely due to human activities.
2 Loss of biodiversity on earth leads to increased survival rate of individuals.
3 More than \(25 \%\) of the drugs available in the market are derived from plants.
4 The importance of key stone sps for proper functioning of ecosystem was explained by Paul Ehrlich.
Explanation:
Loss of bio diversity on earth leads to increased survival rate of individuals- this is a wrong statement.
344886
Statement A : Once covering more than 6 per cent of the earth's land surface, tropical rain forests now cover no more than 4 per cent. Statement B : The Amazon rain forest is called the 'lungs of the planet'.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Statement B is correct and statement A is wrong. Once covering more than 14 per cent of the earth's land surface, tropical rain forests now cover no more than 6 per cent.
BIOXII15: BIODIVERSITY AND CONSERVATION
344887
The extinction of passenger pigeon was due to:
1 Increased number of predatory birds.
2 Over exploitation by humans.
3 Non-availability of the food.
4 Bird flu virus infection.
Explanation:
Passenger pigeons were native birds to North America. They become extinct due to excessive hunting.
NCERT Exemplar
BIOXII15: BIODIVERSITY AND CONSERVATION
344888
What percentage of all living species will go extinct within next 20 to 50 years from human activities, if steps are not taken to conserve species?
1 \(1-2 \%\)
2 \(5-10 \%\)
3 \(10-25 \%\)
4 \(50-75 \%\)
Explanation:
Around \(10-20 \%\) of all living species will go extinct within the next 20 to 50 years from human activities, if steps are not taken to conserve species.
BIOXII15: BIODIVERSITY AND CONSERVATION
344889
Identify the incorrect statements
1 Accelerated rates of sps. extinctions in the world is largely due to human activities.
2 Loss of biodiversity on earth leads to increased survival rate of individuals.
3 More than \(25 \%\) of the drugs available in the market are derived from plants.
4 The importance of key stone sps for proper functioning of ecosystem was explained by Paul Ehrlich.
Explanation:
Loss of bio diversity on earth leads to increased survival rate of individuals- this is a wrong statement.
