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Discuss how classification systems have undergone several chan
Biology
Biology

Class 11

NCERT

Publisher:
NCERT
Subject:
Biology
1

Chapter 1: The Living World

11 questions

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2

Chapter 2: Biological Classification

12 questions

Q1
Discuss how classification systems have undergone several changes over a period of time.
Q2
State two economically important uses of:
(a) Heterotrophic bacteria
(b) Archaebacteria
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3

Chapter 3: Plant Kingdom

12 questions

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4

Chapter 4: Animal Kingdom

15 questions

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5

Chapter 5: Morphology of Flowering Plants

15 questions

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6

Chapter 6: Anatomy of Flowering Plants

12 questions

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7

Chapter 7: Structural Organization in Animals

14 questions

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8

Chapter 8: Cell: The Unit of Life

14 questions

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9

Chapter 9: Biomolecules

15 questions

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10

Chapter 10: Cell Cycle and Cell Division

16 questions

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11

Chapter 11: Transport in Plants

16 questions

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12

Chapter 12: Mineral Nutrition

10 questions

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13

Chapter 13: Photosysnthesis in Higher Plants

9 questions

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14

Chapter 14: Respiration in Plants

12 questions

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15

Chapter 15: Plant Growth and Development

11 questions

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16

Chapter 16: Digestion and Absorption

15 questions

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17

Chapter 17: Breathing and Exchange of Gases

14 questions

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18

Chapter 18: Body Fluids and Circulation

14 questions

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19

Chapter 19: Excretory Products and their Elimination

12 questions

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20

Chapter 20: Locomotion and Movement

10 questions

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21

Chapter 21: Neural Control and Coordination

12 questions

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22

Chapter 22: Chemical Coordination and Integration

9 questions

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Discuss how classification systems have undergone several changes over a period of time.

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Biology (NCERT)

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The classification systems have undergone several changes with time. The first attempt of classification was made by Aristotle. He classified plants as herbs, shrubs, and trees. Animals, on the other hand, were classified on the basis of presence or absence of red blood cells. This system of classification failed to classify all the known organisms.
Therefore, Linnaeus gave a two-kingdom system of classification. It consists of kingdom Plantae and kingdom Animalia. However, this system did not differentiate between unicellular and multicellular organisms and between eukaryotes and prokaryotes. Therefore, there were large numbers of organisms that could not be classified under the two kingdoms.
So, Ernest Haeckel, then, separated unicellular eukaryotic organisms into separate kingdom named Protista and hence, gave three kingdom classification.
After that Copeland separated all prokaryotic organisms into a separate kingdom named Monera and hence, Four-Kingdom systems of classification came into existence.
And lastly, a five kingdom system of classification was proposed by R.H. Whittaker in 1969 to separate achlorophyllous, decomposer organism into a separate kingdom named Fungi. So five kingdoms now are: 
1) Monera
2) Protista
3) Fungi
4) Plantae
5) Animalia
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Question Text
Discuss how classification systems have undergone several changes over a period of time.
TopicBiological Classification
SubjectBiology
ClassClass 11
Answer TypeText solution:1
Upvotes15