Pollen tube releases the two male gamete into the:
(1) One male gamete in cytoplasm of synergids and other in cytoplasm of central cell
(2) Both in cytoplasm of central cell
(3) Cytoplasm of Antipodal cell
(4) Both in cytoplasm of synergids

Subtopic:  Post Pollination Events | Double Fertilization |
 52%
From NCERT
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Read the statements and select option representing correct statements with respect to stamen.
A. The distal end of filament is attached to thalamus.
B. A typical anther is dithecous and bisporangiate.
C. Connective is sterile vasculated tissue.
D. Microsporangia develop further and become pollen sacs.
1. A & B                       2. A & C
3. B & C                       4. C & D

Subtopic:  Stamen: Anther | Stamen: Microsporangium |
 74%
From NCERT
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Outer three layers of anther wall perform the function of

(1) Nourishment                

(2) Protection

(3) Dehiscence                  

(4) Both 2 & 3

 

Subtopic:  Stamen: Anther |
 91%
From NCERT
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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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