NEET Important Questions Sexual Reproduction in Flowering Plants
FAQs on Sexual Reproduction in Flowering Plants NEET Questions
1. What is Cross Pollination?
Cross Pollination is also known as Heterogamy. In it, the sperm carrying pollen grains from the Flowers of one Plant transfers to the other one having egg in order to have a successful Pollination process. Both the angiosperms and gymnosperms process Cross Pollination and Cross fertilization as well. The major reason behind the movement of pollen is because of the flow of wind, which carries them from one cone to another, or by symbiotic relationships. For eg, bees, certain birds and bats. They carry away the pollen from one Plant to another.
2. Describe the structure of the Embryo sac of a mature Angiosperm.
A general mature embryo is a structure of 7 cells and 8 nucleates. In the end of micropylar, there is an egg cell and 2 synergid cells present. Synergid cells have filiform in it which takes the entry of pollen tube into the embryo sac during the process of fertilization. There are three Antipodal cells at the chazal end and in the center, there are two polar Nuclei present which later form diploid secondary Nuclei after the process of fertilization. Therefore, 7 cells and 8 Nuclei.
3. What are the events which take place after the Fertilization in Plants?
The changes which are seen among the Plants after the fertilization in Plants are that zygote undergoes mitotic divisions. Later, it develops into a multicellular embryo, which is called embryogeny. The nucleus of the main endosperm divides in a continuous manner and increases the endosperm in order to fulfill the nourishment for the embryo which is developing. Later, there is an expansion in the embryo sac and the nucleus gets totally used up by the embryo present. Ovule converts into a seed coat and ovary develops into a fruit.
4. What is a BiSexual Flower?
The male reproductive part in a Flower is called stamen, and the female reproductive part in the same is known by the name of carpel. A biSexual Flower is defined as one which has both the functional parts present in them. Some of the Examples of the same are lilies, roses, tulips, sunFlowers, and daffodils. They are also referred to as hermaphroditic. BiSexual Flowers have all the components within them namely Flower, calyx, and corolla, with stamens and carpel obviously.
5. What is the difference between zoospore and zygote?
They both are the types of spores formed after the fusion of gametes of unicellular organisms. The major difference between zoospore and zygote is that zoospore is a haploid structure, whereas zygote is a diploid structure. Though, these both spores mainly originate from sporangia, but zoospores have locomotive abilities and zygotes are strictly non-motile. Zoospore on the other hand, is a naked spore. It does not have a spore wall, whereas zygote has a thick wall support. One similarity is that both are produced by protists, fungi, and bacteria and are aSexual in every means.
