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Diatoms are also called as ‘pearls of ocean’, why? What is dia
Biology Exemplar
Biology Exemplar

Class 11

NCERT Exemplar

Publisher:
NCERT
Subject:
Biology
1

Chapter 1: The Living World

37 questions

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2

Chapter 2: Biological Classification

33 questions

Q1
In the five kingdom system of Whittaker, how many kingdoms are eukaryotes?
Q2
Diatoms are also called as ‘pearls of ocean’, why? What is diatomaceous earth?
Q3
There is a myth that immediately after heavy rains in forest, mushrooms appear in large number and make a very large ring or circle, which may be several metres in diameter. These are called as ‘fairy rings’. Can you explain this myth of fairy rings in biological terms?
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3

Chapter 3: Plant Kingdom

28 questions

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4

Chapter 4: Animal Kingdom

45 questions

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5

Chapter 5: Morphology of Flowering Plants

42 questions

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6

Chapter 6: Anatomy of Flowering Plants

52 questions

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7

Chapter 7: Structural Organization in Animals

48 questions

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8

Chapter 8: Cell: The Unit of Life

39 questions

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9

Chapter 9: Biomolecules

31 questions

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10

Chapter 10: Cell Cycle and Cell Division

43 questions

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11

Chapter 11: Transport in Plants

66 questions

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12

Chapter 12: Mineral Nutrition

39 questions

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13

Chapter 13: Photosynthesis in Higher Plants

59 questions

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14

Chapter 14: Respiration in Plants

42 questions

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15

Chapter 15: Plant Growth and Development

48 questions

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16

Chapter 16: Digestion and Absorption

34 questions

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17

Chapter 17: Breathing and Exchange of Gases

32 questions

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18

Chapter 18: Body Fluids and Circulation

42 questions

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19

Chapter 19: Excretory Products and their Elimination

44 questions

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20

Chapter 20: Locomotion and Movement

39 questions

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21

Chapter 21: Neural Control and Coordination

31 questions

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22

Chapter 22: Chemical Coordination and Integration

39 questions

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Question
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Diatoms are also called as ‘pearls of ocean’, why? What is diatomaceous earth?

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Diatoms and desmids are inducted under chrysophytes, kingdom–Protista. These are the main producers in the ocean. They prepare food not only for themselves but also for the other life forms in the ocean. This is the reason they are also called as ‘pearls of ocean. Body of diatoms is covered by siliceous shell known as frustule.
‘Diatomaceous earth’ is the accumulation of large deposits of diatoms that forms a siliceous covering extending for several 100 m formed in billions of years. The material obtained from these deposits is used in polishing and filteration of oils and syrups.
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Q1
In the five kingdom system of Whittaker, how many kingdoms are eukaryotes?
Q2
Diatoms are also called as ‘pearls of ocean’, why? What is diatomaceous earth?
Q3
There is a myth that immediately after heavy rains in forest, mushrooms appear in large number and make a very large ring or circle, which may be several metres in diameter. These are called as ‘fairy rings’. Can you explain this myth of fairy rings in biological terms?
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Question Text
Diatoms are also called as ‘pearls of ocean’, why? What is diatomaceous earth?
TopicBiological Classification
SubjectBiology
ClassClass 11
Answer TypeText solution:1
Upvotes112