Male Reproductive Part Flashcards
Filament is responsible for
Transfer of nutrients to anther
Microsporangium is also called
Anther
Anther/ microsporangium are usually
- Tetrasprangiate
- Bilobed
- Dithecous
Filament is attached to
Thalamus
Name the layers inside the anther
- Epidermis
- Endothecium
- Middle layer
- Tapetum
What is the function of epidermis in anther
Responsible for protection
Endothecium is responsible for
Helps on dehiscence of anther
Middle layer is responsible for
Providing nutrition
Tapetum is responsible for
Nutrition by taking food from middle layer and giving it to the microsporangium
State alll the functions of tapetum(7)
- Development of pollen grains
- Formation of exine
- Produces callase enzyme which helps in digestion of callose
- Formation of pollen kit
- Formation of sporopllenin
- Pollen pistil interaction
- Formation of ubish granules
1 MMC ( microsporangium mother cell ) gives rise to how many pollen grains
4
Exception family in which 1 mmc gives rise to 4 pollen grains out of which 3 degenerate
Cypheraceae family
What will asymmetrical karyokinesis of microspore give
- Vegetative cell
- Generative cell
Initially generative cell is attached to the ___________ and then floats in the __________ of vegetative cell
Pollen grain
Cytoplasm
If male gametes are formed in the pollen sac before the pollen is released then
What would it have
3 cells, 1 Vegetative cell and 2 male gametes
Vegetative cell is responsible for the formation of?
Generative cell is responsible for the formation of?
- Pollen tube
- Male gametes
60 % of the angiosperms will have their male gametes released
In the pollen tube and it will have 2 cells
1 vc and 1 gc
Mature pollen grain will have
1. 2 cells
Or
2. 3 cells
2 cells
1 vc and 1 gc
Male gametophyte will have
1. 2 cell
Or
2. 3 cell
3 cell
1 vc & 2 male gametes
When anther is young a group of compactly arranged homogenous cells called ____________________ occupies the centre of each microsporangium
Sporogenous tissue
Ubsish bodies helps in the formation of
Exine
Aero allergens examples(5)
Chenopodium, Parthenium , sorghum, amaranthus, ambrosia
Which aero allergen causes hay fever
Ambrosia
Longest pollen, long ribbon like without exine
Zostera ( sea grasses )
Viability is lost within 30 mins
Rice and wheat
Viability is maintained for months
Rosaceae, leguminoseae and solanaceae
Temperature at which pollen grains are stored in pollen banks and their surrounding
-196 C, liquid nitrogen
Size of pollen grain
25 - 50 micrometer
Thick rigid and ornamental is feature of
Exine, outer wall
Most resistant organic material known
Sporopollenin
Pollen grains are welll preserved as ___________ because of the presence of sporopollenin
Fossils
Intine is made of
Pectin and cellulose
Places where exine is usually absent are called
Germ pore
Dehiscence of anther takes place during which season
Dry season
