The genetic mechanism, that prevents self pollen (from the same flower or other flowers of the same plant) from fertilising the ovules by inhibiting pollen germination or pollen tube growth in the pistil, is called as

1. Dioecy                           

2. Dichogamy

3. Monocliny                    

4. Self incompatibility

Subtopic:  Pollination & Outbreeding Devices |
 91%
From NCERT
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Plants pollinated by wind do not show

(1) Light and non-sticky pollen grains

(2) Well-exposed stamens

(3) Large-sized flowers

(4) Presence of single ovule in each ovary

Subtopic:  Pollination & Outbreeding Devices | Post Pollination Events |
 80%
From NCERT
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Genetically and functionally self-pollination is cent percent ensured with seed formation even in the absence of pollinators by

  1. Bisexuality                   
  2. Dicliny
  3. Geitonogamy               
  4. Cleistogamy
Subtopic:  Pollination & Outbreeding Devices |
 86%
From NCERT
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Polygonum type embryo sac is

(1) Monosporic

(2) Seven celled with one largest binucleate cell

(3) Eight nucleated with 3 + 2 + 3 arrangement

(4) All are correct

 

Subtopic:  Pistil: Female Gametophyte |
 91%
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Ovule generally differentiate a single _____ in the ______ region of the nucellus.

(1) Megaspore mother cell, micropylar

(2) Megaspore, micropylar

(3) Megaspore, mother cell, chalazal

(4) Primary

 

Subtopic:  Pistil: Ovule |
 69%
From NCERT
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How many statement(s) is/are correct for pollen grains?
a. Parthenium is a cause of bronhial afflictions
b. Intine exhibits fascinating array of patterns and designs
c. Cytoplasm of pollen grain is surrounded by spermoderm
d. Generative cell is present when pollens are shed in 40 percent plants.
1. One                             2. Two
3. Three                          4. Four

Subtopic:  Stamen: Male Gametophyte |
 55%
From NCERT
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Fossilization of pollen grains is helped by

(1) Compatible protein  

(2) Sporopollenin

(3) Cellulose                       

(4) Pectin

 

Subtopic:  Stamen: Male Gametophyte |
 94%
From NCERT
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The largest cell of embryo sac is

(1) Antipodal                     

(2) Synergid

(3) Central cell                   

(4) Egg

 

Subtopic:  Stamen: Male Gametophyte |
 86%
From NCERT
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Read the statements carefully and select correct option.
A. Pollen grains of carrot grass cause bronchial afflictions
B. Pollen viability is maximum in wheat
C. Pollen grains are well preserved as, fossils due to pecto-cellulose
D. Pollen grain aperture is devoid of sporopollenin.
1. A and D                   2. A and B
3. B and C                   4. A, B and D

Subtopic:  Stamen: Male Gametophyte |
 85%
From NCERT
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Which of the following statements for generative cell is incorrect?

(1) Floats in the cytoplasm of vegetative cell

(2) Has abundant food reserve

(3) Spindle-shaped

(4) Dense cytoplasm with a nucleus

 

Subtopic:  Stamen: Male Gametophyte |
 80%
From NCERT
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