the above is diagram,explain briefly about it
Answers
Explanation:
A flower which contains both male and female reproductive organs is called as a bisexual flower.
The male reproductive organ is called as an androecium and the female reproductive organ is called as a gynoecium.
A bisexual flower consists of calyx, corolla, stamens and carpel.
A unit of calyx is called as a sepal. Sepals are green in colour and are present just above the stalk of the flower.
A unit of corolla is called as a petal. Petals have different colours and are present above the sepals.
Androecium is the male reproductive part of the flower and is also called as a stemen. Stamen is made up of an anther and a filament.
Gynoecium is the female reproductive part of the flower and is also called as a carpel. The parts of the carpel are style, stigma and ovary.
STAMEN AND PISTIL - DEFINITION
concept
Stamens are the male reproductive parts of the flower.
The stamens are collectively known as androecium.
Stamens contain a stalk called filament and a sac-like structure known as anther.
The anther has pollen grains which are transferred to the stigma of the flower for germination.
The collection of anther is known as androecium.
The pistil is the female part of the plant.
It contains ovary, style and stigma.
The collection of the pistil is known as gynoecium.
Answer:
Fertilization in flowering plants happens through a process called pollination. Pollination occurs when pollen grains from the anther land on a stigma. ... Fertilization occurs when one of the sperm cells fuses with the egg inside of an ovule. After fertilization occurs, each ovule develops into a seed.
Explanation:
Plants can transfer pollen through self-pollination; however, the preferred method is cross-pollination, which maintains genetic diversity.
In angiosperms, pollination is defined as the placement or transfer of pollen from the anther to the stigma of the same or a different flower. In gymnosperms, pollination involves pollen transfer from the male cone to the female cone. Upon transfer, the pollen germinates to form the pollen tube and the sperm that fertilize the egg.
Pollination takes two forms: self-pollination and cross-pollination. Self-pollination occurs when the pollen from the anther is deposited on the stigma of the same flower or another flower on the same plant. Cross-pollination is the transfer of pollen from the anther of one flower to the stigma of another flower on a different individual of the same species. Self-pollination occurs in flowers where the stamen and carpel mature at the same time and are positioned so that the pollen can land on the flower’s stigma. This method of pollination does not require an investment from the plant to provide nectar and pollen as food for pollinators. These types of pollination have been studied since the time of Gregor Mendel. Mendel successfully carried out self-pollination and cross-pollination in garden peas while studying how characteristics were passed on from one generation to the next. Today’s crops are a result of plant breeding, which employs artificial selection to produce the present-day cultivars. An example is modern corn, which is a result of thousands of years of breeding that began with its ancestor, teosinte. The teosinte that the ancient Mesoamericans originally began cultivating had tiny seeds, vastly different from today’s relatively giant ears of corn. Interestingly, though these two plants appear to be entirely different, the genetic difference between them is minuscule.
Pollen
Pollen grains (from the greek palynos for dust or pollen) contain the male gametophyte (microgametophyte) phase of the plant. Pollen grains are produced by meiosis of microspore mother cells that are located along the inner edge of the anther sacs (microsporangia). The outer part of the pollen is the exine, which is composed of a complex polysaccharide, sporopollenin. Inside the pollen are two (or, at most, three) cells that comprise the male gametophyte. The tube cell (also referred to as the tube nucleus) develops into the pollen tube. The germ cell divides by mitosis to produce two sperm cells. Division of the germ cell can occur before or after pollination.
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