Which fertilization in double fertilization forms the endosperm?
Double fertilization is characterized by the formation of two embryos: the embryo-proper which is diploid, and the fusion product of the central cell with one male gamete which is triploid. This secondary triploid zygote develops into the endosperm (Fig.
In which of the following plant endosperm is formed after fertilization?
In an angiospermic plant, endosperm is formed due to fertilization of secondary nucleus but it is absent in some of the seeds viz. pea, bean, phaseolus (moong) etc.
What is double fertilization and triple fusion?
The main difference between triple fusion and double fertilization is that in double fertilization, the embryo sac and two sperm cells fuse, whereas the sperm nucleus and two polar nuclei fuse in the central cell of the embryo sac in the process of triple fusion.
What is the fusion of pollen and ovule called?
The haploid sperm and haploid egg combine to form a diploid zygote, the process being called syngamy, while the other sperm and the two haploid polar nuclei of the large central cell of the megagametophyte form a triploid nucleus (triple fusion).
What is the female gametophyte?
The female gametophyte, also referred to as the embryo sac or megagametophyte, develops within the ovule, which, in turn, is embedded within the ovary of the carpel. Among angiosperms, the female gametophyte has a variety of forms.
What is the female part of a flower?
What are the 3 female parts of a flower?
The female part is the pistil. The pistil usually is located in the center of the flower and is made up of three parts: the stigma, style, and ovary. The stigma is the sticky knob at the top of the pistil.
What are the two female parts of a flower?
The “male” or pollen-bearing part is called the stamen, and is composed of the filament and the anther. The “female” or seed-bearing part is called the pistil, and is composed of the ovary, the stigma, and the style. A flower may have exclusively male parts, exclusively female parts, or commonly, both.
What are the 4 female parts of a flower?
It consists of four major parts:
- Stigma – The head of the pistil. The stigma receives pollen, which will begin the process of fertilization.
- Style – This is the name for the stalk of the pistil.
- Ovary – The base of the pistil.
- Ovules – These are the flower’s eggs, located inside the ovary.
What are the essential and non essential parts of a flower?
Answer. The two inner whorls in a flower consists is stamens and pistils are called essential part of flower . consequently calyx and corolla are sterile and are referred to as non essential or accessory part of a flower.
What are the essential parts of flower?
Essential parts of a flower are those that are directly associated with reproduction. E.g. Stamen and Carpel.
What are non-essential parts of a flower?
Anther and filament are the parts of male reproductive organ of flower called stamen whereas stigma, style and ovary are parts of female reproductive organ of flower called carpel. They are called essential floral organs. Sepals and petals are accessory or non-essential floral organs as they have only supportive role.
What are the essential whorls of a flower?
Flowers contain the plant’s reproductive structures. A typical flower has four main parts—or whorls—known as the calyx, corolla, androecium, and gynoecium (Figure 1). The outermost whorl of the flower has green, leafy structures known as sepals.
Which are the essential whorls of a flower why are they so called?
♕ ⭕The essential whorls of a flower are androecium and gynoecium. They are called so because they are necessary for reproduction.
What are the four main parts of a flowering plant?
Most flowers have four main parts: petals, stamen (anther and filament), pistil (stigma, style and ovary), and sepals.
What is Polypetalous?
: having or consisting of separate petals.
What is Polypetalous give an example?
Polypetalous: Flowers having free petals. Example: Rose and Camellia. Gamopetalous: Flowers have fused or united petals. Example: Bindweed and elderberry flowers have gamopetalous petals.
What is Polypetalous condition in a flower?
When all the petals of flower are free then it is called Polypetalous condition and when petals are fused, then it is called gamopetalous condition. polypetalous – having a corolla composed of many separated or distinct petals.
What is meant by Polyadelphous?
of stamens. : united by the anthers into three or more groups — compare diadelphous, monadelphous.
Is bombax a Polyadelphous?
The filaments are united in several groups. Example: Bombax – polyadelphous.
What is Syngenesious?
The syngenesious or synantherous condition of androecium is a feature of the family Asteraceae wherein, the anthers of the filaments are fused to form the tubular mass or group and their filaments remain free.
Is Citrus a Polyadelphous?
The polyadelphous stamen is seen in citrus; these have many small bunches of the fused stamen. So, the correct answer is Lemon. Note: Sometimes there is a variation in the length of the filaments of stamens seen in a single flower. This kind of variation is found in Salvia and mustard.
Is Lemon a Polyadelphous?
-Lemon displays stamens that are polyadelphous. – Cotton displays stamens that are monadelphous. Thus, the option D is not the correct option. Thus, the correct answer is option (A) Lemon.
Is Pea a monadelphous?
In monadelphous stamens, the filaments of all stamens are united forming a single bundle but the anthers are free, e.g., cotton, lady’s finger. Diadelphous stamens have filaments united forming two bundles and anthers are free eg. gram, pea, bean.
What is Syngenesious anther?
Syngenesious stamen are those stamens whose anthers are united together into a tube and its filaments are free. Unlike the syndranous stamen these are not united by both anthers and filaments. This condition of syngenesious stamen is usually found in the asteraceae family.
What is Didynamous condition?
: having four stamens disposed in pairs of unequal length —used especially of plants of the families Scrophulariaceae and Labiatae.
What is Gynostegium?
A characteristic and complex structure created by the fusion of the stamens with the stigma is the gynostegium. It is a complex structure produced by the fusion of stamens, styles, and surfaces that are stigmatic.
What is Diadelphous condition?
diadelphous (not comparable) (botany) Having its stamens fused together at least partly by the filaments so that they form two separate bundles, or a bundle and a lone separate stamen.