MEDIUM
12th CBSE
IMPORTANT
Earn 100

Chlorofluorocarbons (CFC's) are widely used as refrigerants. Then why it is suggested to reduce their admission as far as possible? Explain.

Important Questions on Environmental Issues

HARD
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 16 - Environmental Issues>TEST QUESTIONS>Q 11

Study the graph. Explain how is Oxygen concentration affected the river when sewage is discharged into it.

Question Image

MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 16 - Environmental Issues>TEST QUESTIONS>Q 12
How did Ahmed Khan, plastic sack manufacturer from Bangalore, solve the ever-increasing problem of accumulating plastic waste? 
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 16 - Environmental Issues>TEST QUESTIONS>Q 13
Name any two sources of e-wastes and write two ways for their disposal.
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 16 - Environmental Issues>TEST QUESTIONS>Q 14
What is joint forest management? How can it help in conservation of forest?
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 16 - Environmental Issues>TEST QUESTIONS>Q 15
Explain the relationship between CFC's and Ozone in the stratosphere.
HARD
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 16 - Environmental Issues>TEST QUESTIONS>Q 16
List the events that reduce the biological oxygen demand (BOD) of a primary effluent during sewage treatment.
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 16 - Environmental Issues>TEST QUESTIONS>Q 17
List four benefits to human life by eliminating the use of CFC's.
HARD
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 16 - Environmental Issues>TEST QUESTIONS>Q 18
Plenty of algal blooms observed in a pond in your locality. Write what has posted this bloom and how does it affect the quality of water.