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How do ecologists estimate the total number of species present
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

Q1
Name the three important components of biodiversity.
Q2
How do ecologists estimate the total number of species present in the world?
Q3
Give three hypotheses for explaining why tropics show greatest levels of species richness.
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16

Chapter 16: Environmental Issues

11 questions

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Question
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How do ecologists estimate the total number of species present in the world?

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Updated on: Nov 13, 2022

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Biology (NCERT)

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The diversity of living organisms present on the Earth is very vast. According to an estimate by researchers, it is about seven millions.
The total number of species present in the world is calculated by ecologists by statistical comparison between a species richness of a well studied group of insects of temperate and tropical regions. Then, these ratios are extrapolated with other groups of plants and animals to calculate the total species richness present on the Earth.

Population Explosion refers the sudden and rapid rise in the size of Population.
Population Explosion refers the sudden and rapid rise in the size of population, especially human population. It is an unchecked growth of human population caused as a result of:

  1. Increased birth rate,
  2. Decreased infant mortality rate, and
  3. Improved life expectancy.
Population explosion is more prominent in under-developed and developing countries than in developed countries.
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Question Text
How do ecologists estimate the total number of species present in the world?
Updated OnNov 13, 2022
TopicBiodiversity and Conservation
SubjectBiology
ClassClass 12
Answer TypeText solution:1 Video solution: 1
Upvotes93
Avg. Video Duration4 min