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Write critical notes on the following: (a) Eutrophication (b)
Biology
Biology

Class 12

NCERT

Publisher:
NCERT
Subject:
Biology
1

Chapter 1: Reproduction in Organisms

18 questions

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2

Chapter 2: Sexual Reproduction in Flowering Plants

18 questions

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3

Chapter 3: Human Reproduction

21 questions

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4

Chapter 4: Reproductive Health

12 questions

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5

Chapter 5: Principles of Inheritance and Variation

16 questions

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6

Chapter 6: Molecular Basis of Inheritance

14 questions

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7

Chapter 7: Evolution

10 questions

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8

Chapter 8: Human Health and Disease

17 questions

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9

Chapter 9: Strategies for Enhancement in Food Production

12 questions

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10

Chapter 10: Microbes in Human Welfare

15 questions

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11

Chapter 11: Biotechnology: Principles and Processes

12 questions

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12

Chapter 12: Biotechnology and its Applications

10 questions

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13

Chapter 13: Organisms and Populations

17 questions

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14

Chapter 14: Ecosystem

13 questions

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15

Chapter 15: Biodiversity and Conservation

10 questions

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16

Chapter 16: Environmental Issues

11 questions

Q1
Match the items given in column A and B.
Q2
Write critical notes on the following:
(a) Eutrophication
(b) Biological magnification
(c) Groundwater depletion and ways for its replenishment
Q3
Why ozone hole forms over Antarctica? How will enhanced ultraviolet radiation affect us?
View all question
Question
Easy
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Solving time: 7 mins

Write critical notes on the following:
(a) Eutrophication
(b) Biological magnification
(c) Groundwater depletion and ways for its replenishment

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Views: 5,658 students

Updated on: Oct 1, 2023

Book

Book:

Biology (NCERT)

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Write critical notes on the following:
(a) Eutrophication
(b) Biological magnification
(c) Groundwater depletion and ways for its replenishment
8 mins ago
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8 mins ago

Text SolutionText solutionverified iconVerified

a) Eutrophication refers to the excessive rich nutrients running into the water body which leads to algal bloom. The algal bloom upon not only reduces the oxygen content of the water required for the aquatic animals to survive, some of them actually produces toxins and harmful substances that have negative impact on aquatic life.
b) Biological magnification: Biological magnification refers to the accumulation of toxins like pesticides as we go up in the food chain. e.g. spraying water bodies with agents like DDT to control mosquitoes will cause trace amounts of DDT to accumulate in the cells of microscopic aquatic organisms, clams and some fish consuming many of these accumulate more of DDT and in humans consuming these fishes the DDT concentration is magnified (more DDT).
c) Groundwater depletion is a major threat to the future. This can be replenished by harvesting the rainwater by digging holes in the ground and storing them during rainy season and also by planting the plants. 
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Question Text
Write critical notes on the following:
(a) Eutrophication
(b) Biological magnification
(c) Groundwater depletion and ways for its replenishment
Updated OnOct 1, 2023
TopicEnvironmental Issues
SubjectBiology
ClassClass 12
Answer TypeText solution:1 Video solution: 2
Upvotes258
Avg. Video Duration2 min