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The heterosporous pteridophyte show certain characteristics, w
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

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3

Chapter 3: Plant Kingdom

28 questions

Q1
Each plant or group of plants has some phylogenetic significance in relation to evolution Cycas, one of the few living members of gymnosperms is called as the ‘relic of past’. Can you establish a phylogenetic relationship of Cycas with any other group of plants that justifies the above statement? 
Q2
The heterosporous pteridophyte show certain characteristics, which are precursor to the seed habit in gymnosperms. Explain. 
Q3
Comment on the life cycle and nature of a fern prothallus. 
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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
Hard
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Solving time: 4 mins

The heterosporous pteridophyte show certain characteristics, which are precursor to the seed habit in gymnosperms. Explain. 

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Updated on: Sep 19, 2022

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Biology Exemplar (NCERT Exemplar)

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The heterosporous pteridophyte show certain characteristics, which are precursor to the seed habit in gymnosperms. Explain. 
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Heterospory, i.e., production of two types of spores smaller microspores and larger megaspore was first reported in Selaginella a pteridophyte. In Selaginella, the smaller microspores are destined to produce male gametophytes and the larger megaspores to female gametophyte. 
The male gametophyte produces male gametes, whereas the female gametophyte produces archegonia and also provides nourishment to the developing embryo.
The phenomenon of heterospory, thus lead to the reduction of gametophyte, in situ germination of spores, retention of megagametophyte in the megasporangia and finally to the seed development. Thus, the heterospory in Selaginella forms the base for seed habit development in gymnosperms. 
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Q1
Each plant or group of plants has some phylogenetic significance in relation to evolution Cycas, one of the few living members of gymnosperms is called as the ‘relic of past’. Can you establish a phylogenetic relationship of Cycas with any other group of plants that justifies the above statement? 
Q2
The heterosporous pteridophyte show certain characteristics, which are precursor to the seed habit in gymnosperms. Explain. 
Q3
Comment on the life cycle and nature of a fern prothallus. 
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Question Text
The heterosporous pteridophyte show certain characteristics, which are precursor to the seed habit in gymnosperms. Explain. 
Updated OnSep 19, 2022
TopicPlant Kingdom
SubjectBiology
ClassClass 11
Answer TypeText solution:1 Video solution: 2
Upvotes210
Avg. Video Duration10 min