Sexual reproduction in flowering plants (New syllabus chapter 1 / old syllabus Chapter 2)

Pre-fertilization|Structure of Stamen|reproduction in flowering plants|short notes| NCERT| standard 12| Biology

Fertilization process in plants has 3 steps

Consists of 2 process

1. Gametogenesis

Male reproductive part - microsporogenesis

Female reproductive part - macrosporogenesis

2. Gamete transfer

Decision of flower production on plant taken much before Actual flower seen
initiated by - Hormonal changes & structural changes

Differentiation occurs- further development into floral primordium

Primordium - An aggregation of cells that is the first stage in the development of an organ

That converts into inflorescence - bear floral buds - then flower develops

Inflorescence - a bunch of flowers arranged together

In flower, essential whorls differentiate and develop

1. Filament - long and slender stalk

2. Anther - generally bilobed

Each lobe - contain 2 theca - Dithecous

One anther- 4 theca

Each side contain 1 microsporangia

Hence 4 microsporangia present - tetrasporangiate

Each microsporangia - develops into pollen sac

extend longitudinally all through the length of an anther
packed with pollen grains.

All three names are for one thing only, but they are name of different stages and named according to their functions.

Line of dehiscence: longitudinal groove runs lengthwise separating the theca

Help in pollen dispersion at maturity

Thank you for reading!

Happy learning!

Manish Mevada

Urvi Bhanushali