MEDIUM
12th Tamil Nadu Board
IMPORTANT
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Important Questions on Environmental Issues

EASY
12th Tamil Nadu Board
IMPORTANT
Zoology Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Environmental Issues>Exercise>Q 26
Mark the incorrect statements with respect to the effect of deforestation.
EASY
12th Tamil Nadu Board
IMPORTANT
Zoology Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Environmental Issues>Exercise>Q 27

Read the following statements:

A. The main cause of desertification is urbanization.

B. Water logging in the soil results from irrigation without proper drainage of water.

C. Besides affecting the crops, water logging draws salts to the surface of soil.

D. Increased salt concentration damages agriculture.

How many of the above statements are correct

EASY
12th Tamil Nadu Board
IMPORTANT
Zoology Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Environmental Issues>Exercise>Q 28
Loss of forests, urbanisation, and increasing pollution are all due to
EASY
12th Tamil Nadu Board
IMPORTANT
Zoology Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Environmental Issues>Exercise>Q 29
One of the chief reasons among the following for the depletion in the number of species making endangered is
MEDIUM
12th Tamil Nadu Board
IMPORTANT
Zoology Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Environmental Issues>Exercise>Q 30
What do you understand by agrochemicals. Can you give some examples?
HARD
12th Tamil Nadu Board
IMPORTANT
Zoology Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Environmental Issues>Exercise>Q 31
Write in brief about the role of agro-chemicals and mention their effects.
MEDIUM
12th Tamil Nadu Board
IMPORTANT
Zoology Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Environmental Issues>Exercise>Q 32
A crane had DDT level as 5 ppm in its body. What would happen to the population of such birds? Explain giving reasons.
MEDIUM
12th Tamil Nadu Board
IMPORTANT
Zoology Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Environmental Issues>Exercise>Q 33
Write critical notes on eutrophication.