.PNG)
What are the sexual organs of plants?
Sexual Reproduction in Plants – Unisexual and Bisexual. The flowers are the reproductive parts of a plant. The stamens are the male reproductive part and the pistil is the female reproductive part.
What are the reproductive structures of plants?
Structure. As a plant's reproductive part, a flower contains a stamen (male flower part) or pistil (female flower part), or both, plus accessory parts such as sepals, petals, and nectar glands (Figure 19). The stamen is the male reproductive organ. It consists of a pollen sac (anther) and a long supporting filament.
What are the male and female parts of a plant?
The female part of the plant is the pistil, and the male part of the plant is the stamen. The pistil includes the ovary, the style and the stigma. The stamen consists of the anther and a filament. Pollen consists of male reproductive cells. Flowers are the reproductive structures of flowering plants.
How do plants reproduce asexually?
– Asexual reproduction by fragmentation Most plant cells have the ability to “de-differentiate” or lose their identity and form a new individual if they are isolated from the plant that gave rise to them. This property allows them to reproduce asexually through fragments of their own bodies or even from individual cells.
What is the male reproductive organ containing anther and filament, collectively called?
Androecium: It is the male reproductive organ containing anther and filament, collectively called Stamen. The anther is the region where pollen grains are produced for pollination and filament supports the anther. Stamen is the region in which the microsporangium or pollen sac is present. Generally, anther is bi-lobed and tetra-sporangiate. Each microsporangium contains numerous microsporocytes or microspore parent cells (a diploid cell).
Which region of a flower contains the corolla and calyx?
Perianth: it is the non-reproductive region in the flower which contains calyx and corolla, hence preserving the reproductive region in a flower.
How many layers of pollen are there?
Mature pollen grain has 2 layers exine (outer layer) composed of sporopollenin, and intine (inner layer) consisting of cellulose or hemicellulose. The pollen grain undergoes mitosis to form two nuclei; the vegetative nucleus and generative nucleus. A thin wall differentiates them into large vegetative cell/tube cell and the small generative cell.
What is the chemical that provides the pollen grain?
The pollen sacs or microsporangia is enclosed by tapetum, present in anther. The tapetal cells provide the pollen grain with a chemical called sporopollenin, a carotenoid, helping it achieve the waterproof property; conserving it during transit. The mature pollen grain is developed within the pollen sacs and ruptures the pollen sacs to be released outside.
How is endosperm obtained?
The endosperm is obtained as a result of triple fusion in the embryo sac of the ovule. The endosperm serves as the nourishment tissue for the development of the seed. It often contains starch, proteins, oil, etc., essential for seed growth and for its unique characteristics. In monocotyledons, endosperm serves as the source of nutrition for the embryo during germination like in wheat, maize and in dicotyledons, the endosperm is absorbed, and cotyledons serve as a source of nutrition to the embryo during germination.
What is the process of producing haploid gametes?
Gametogenesis is the production of haploid male and female gametes by diploid gametophyte, which take part in pollination and fertilization . The production of female gamete from megaspore mother cell is known as megasporogenesis; takes place in megasporangium. The production of male gamete from microspore mother cell is known as microsporogenesis; takes place in microsporangium.
What is the term for the transfer of pollen from one plant to another?
It is also called xenogamy. Cross-pollination usually occurs by the intervention of the pollinators like wind, insects, or water. E.g.: Jasmine, coriander, Calotropis.
Reproduction in Flowering Plants/ Angiosperms
Reproduction in Flowering Plants – Pollination
Reproduction in Flowering Plants – Gametogenesis
Reproduction in Flowering Plants – Fertilization
FAQs on Reproduction in Flowering Plants
- Pollination is a process in which the pollen grains from the anther is deposited on the receptive region of stigma in the pistil. Pollination is of two types: