Please enable JavaScript.
Coggle requires JavaScript to display documents.
Reproduction in plants - Coggle Diagram
Reproduction in plants
-
-
Structures and functions of the parts of a flower
Pedicel ---> flower stalk
Receptacle --> Enlarged end of the pedicel where flower structures are attached
Petals --> Brightly coloured and sometimes scented, arranged in a cylinder known as the corolla
Sepal --> Modified petals that protects the flower in the bud stage. All sepals make up the calyx
Stamen
Male reproductive element
- all stamens make up the andromecium
Anther
- each anther made of 2 lobes, with 2 pollen sacs each
- in each pollen sac there are pollen grains
- and in each pollen grains there are 2 male gametes
Filament
- holds up the anther in a suitable position to release pollen grains
Carpel
Female reproductive organ
- All carpels make up the pistil
Stigma
- recieves pollen grains**
Style
- holds stigma out
- conects stigma to ovary
- ovary contains one or more ovules
- ovule contains female gamete (ovum)
- ovary is connected to ovule via placenta
Pollination
Pollination is thee transfer of pollen grains from anther of the stamen to the stigma of the pistil/carpelanthers split open, exposing the pollen grains that are to be carried away by
-
Difference in plants
Self-pollination
- Bisexual flowers/monoecious plants
- same maturation times of anthers and stigmas
- anthers situated just above the stigmas of the same flower
- cleistogamous (closed) flowers
- flowers are closed --> self-pollination unavoidable
Cross-pollination
- Dioecious plants --> since different sexes are on different plants, cross-pollination is unavoidable
- Different maturation times of anthers and stigmas
- anthers and stigmas of same flower situated far apart
- chemical incompatibility
-
-