Karteikarten
sexual reproduction in flowering plants
Karten in diesem Stapel (58)
- 1bilobed antheran anther having two lobes
- 2dithecous anthereach lobe of anther having two theca
- 3microsporangiaa sporangium containing microspores
- 4pollen sacsdeveloped from microsporangia
- 5tapetumthe innermost layer of the microsporangium. it is multinucleated with dense cytoplasm.
- 6sporogenous tissuethe tissue which occupies the center of each microsporangium
- 7microsporogenesisthe process of formation of microspores from pollen mother cells through meiosis.
- 8microsporespollen grains/male gametophyte
- 9sporopolleninpresent on the outer surface of the pollen grains. most resistant organic material known.
- 10germ poreswhere sporopollenin is absent from the exine.
- 11partheniumalso known as carrot grass causes pollen allergies.
- 12pollen bankswhere pollens are stored in liquid nitrogen
- 13megasporangiumovule
- 14monocarpellarygynoecium which consists of a single pistil
- 15multicarpellarygynoecium which consists of many pistils
- 16syncarpouspistils are fused
- 17apocarpouspistils my be free
- 18loculethe ovarian cavity inside the ovary
- 19placentalocated inside the ovarian cavity
- 20funiclestalk attaches the placenta to the ovule
- 21hilumfusion point of ovule and placenta
- 22integumentsprotective envelopes of the ovule
- 23micropyletip where integuments are absent
- 24chalazaopposite to micropyle
- 25nucellusunder the integuments
- 26embryo sacfemale gametophyte under the nucellus
- 27megasporogenesisprocess of formation of megaspore from megaspore mother cell
- 28monosporic developmentformation of embryo sac from single megaspore
- 29free nuclear divisionswhere the cell walls are not laid down immediately after nuclear divisions.
- 30pollinationtransfer of the pollen grain to the stigma of a pistil.
- 31autogamypollination within the same flower
- 32chasmogamyautogamy where flowers are open
eg viola, oxalis and commelina - 33cleistogamyautogamy where flowers are not open.
- 34geitonogamytransfer of pollen grain from the same flower of a different plant.
- 35xenogamytransfer of pollen grain to a different plant.
- 36outbreeding devicesfowers have developed many devices to discourage self-pollination and encourage cross-pollination
- 37dioecywhere a whole plant only produces either male or female flowers.
- 38artificial hybridizationit is the process in which only desired pollen grains are used for pollination and fertilization
- 39emasculationremoval of anther from a bisexual flower
- 40baggingcovering the pistil to prevent contamination from unwanted pollen.
- 41double fertilizationsyngamy and triple fusion
- 42endospermnutrition reservoir for developing embryo
- 43proembryoformed from zygote
- 44globular embryoafter proembryo
- 45heart-shaped embryoafter globular embryo
- 46mature embryoformed after heart-shaped embryo
- 47epicotylthe portion above the embryo axis
- 48hypocotylbelow the embryonal axis
- 49scutellumcotyledons of the grass family
- 50coleorhizaa sheath protecting the root of a germinating grass or cereal grass
- 51coleoptileit is a pointed protective sheath covering the emerging shoot in monocots
- 52perispermresidual persistent nucellus
eg. black pepper, beet, etc. - 53pericarpdevelopment of the wall of the ovary into a fruit
- 54false fruitswhere other than ovary some other part also contributes to fruit formation eg apple Scarberry and cashew
- 55parthenocarpic fruitsdeveloped without fertilization eg banana
- 56apomixisa form of asexual reproduction that mimics sexual reproduction eg citrus and mango
- 57polyembryonythe occurrence of more than one embryo in a seed.
- 58—
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- class 12 biology Karteikarten am sexual reproduction in flowering plants , erstellt von sakhi rathore am 03/08/2020.
- Erstellt von
- sakhi rathore
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