Pollination

Pollination :-

Transfer of pollen grain fom anther to receptive stigma take place by different agency , these are mainly

1. Self Pollination :-

It involve transfer of pollen grain from anther of flower to stigma of same plant , these are mainly 2 type :-

- Autogamy :-

In These transfer of pollen grain to same flower stigma take place , These Are mainly two type :-

~ Cleistogamy :-

it consist two word "cleisto=Close" & "Gamy=Marriage", In These Transfer Of pollen grain , in which flower neverr open to assure self polination

~ Homogamy :-

Both anther & Stigma Mature At same Time to perform Self pollination , Come close to Each other By Folding & Bending & Perform Homogamy , Ex :- Potato

~ Bud Pollination :-

In These type, Pollination is done before opening the flower

2. Geitonogamy :-

iT Consist of two word "Geitono=Labour" & "gamy=Marriage" , In These Type of pollination anther pollen is transferred to another flower on the same plant. 

@ Disadvantages Of Self Pollination :-

* Progeny Goes to Weak Generation after generation
* Less Changes To produce New Species & New Variety

@ Cross Pollination (Allogamy) :-

Transfer Of pollen Grain one Plant anther to Stigma of another flower

@ Characteristics Why Cross Pollination Occur :-

- Herkogamy :-

When Some Mechanical Barrier Are Found , Which prvent Pollination , Ex = Pollinea

- Dichogamy :-

In These Type, Stigma of gynoecium & Pollen Grain From anther Mature at different Type to avoid self pollination , These are of two type :-

~ Protogamy :-

In these type of Dichogamy Gynoecium mature first , Ex= Bajra

~ Protandary :-

In These type of Dichogamy Anther mature first , Ex :- maize

- Self Incompability :-

In These type, Pollen grain of flower fall on stigma but not Germinate . Due to some deposition of Some cementing Material (Callose) in stigma . That's why pollen tube cannot Penetrate stigma

- Male Sterlity :-

In Some Plant,Pollen Grain Become Non-functional so, Cross pollination always Occur In Bisexual Plant

@ Vector or Agent which Help in Pollination :-

There Are mainly two type of Factor

i) Abiotic factor :-

These Are Non-Living Factor , Some Example of these are :-

~ By Wind (Anemophily) :-

Pollination in which wind act as vector For Pollination,

# Charcter for Wind Pollination :-

- Plant Having Colourless, Nector less, Unisexual Character
- Male flower Are More Abundant ,
- pollen grain Are small , Dusty, Light & Produce In Huge Quantity
- In These Flower Are well Exposed,
- Stigma Are Larged Hairy

# Gum POwder Mechanism :-

In Urtica , Flower Burst Suddenly & POllen grain Come Into air

two type :-

~ By Water (hydrophily) :-

Pollination in Which Water act as Vector For Pollination

ii) Biotic Factor :-

These are The Living Factor , which aact as vector for pollination are :-

~ By Bird (Ornitophily) :-

Pollination in Which Bird act as Vector For Pollination

~ By Insect (Entomophily) :-

Pollination in Which insect act as Vector For Pollination

~ By Bat (Chiropterophily) :-

Pollination in Which bat act as Vector For Pollination