Question

1. What does the male gametophyte in flowering plants lack that we see in the male gametophyte in gymnosperms (e.g. pine)? [answer]

2.

The light grey oval in the middle of this image above is a The fertilized ovule will become the seed. Because this is a flowering plant, the seeds will be protected by the surrounding

3.Double fertilization in flowering plants results in the 2N_____________ and the 3N _______________ . The 3N tissue is important because it will provide ___________________ for the growing seed.

4. A complete flower will have the following four parts (listed in order below from the outer part of the flower inward): _____________ , ______________, ______________ , _______________.

5. The picture above is pollen on the female part of a flower. This process is called____________ . The 5-part structure that has the pollen on it is called the _____________ . The slender red part of the flower in the image above is called the ________________ .  

Answer 1

1. Ans: Flower producing plants called as angiosperms plants and they look very attractive and beautiful. The reproduction in plants occurs in flowers because it consists of the reproductive system. The anther (male reproductive system) and stigma or gynoecium (female reproductive system) are seen within the flowers. Pollen grains is the male gametophytes and embryo sac which contain ovum is the female gametophyte. The function of male gametophyte is the production of sperm cells and female gametophyte is eggs. Later on after pollination, the sperm cells and egg cell fused together to form a zygote, and this process known as fertilization.

Gymnosperm is the green leafy sporophyte which contains both male and female gametophyte separately. Male cone is smaller than the female cone. They depend upon the wind for the pollination. The male gametophyte contains microsporophylls which produce pollen. In the female gametophyte, the mother megaspore cell divided by meiosis and produce 4 haploid daughter megaspore in which one megaspore divide to form female gametophyte. In gymnosperm, the ovary is absent so the double fertilization not occurs. The male and female gametophyte is present in a different cone rather than the flowers and pollination is take place through the wind. Female cone located upper than the male cone. eg. pine.

2. Ans: Embryo sac, ovule, Ovary

3. Ans: Double fertilization in flowering plants results in the 2N__Diploid zygote___ and the 3N ____Triploid nucleus_(Endosperm)___. The 3N tissue is important because it will provide ____Nourishment_____ for the growing seed.

4. Ans: A complete flower will have the following four parts (listed in order below from the outer part of the flower inward): Calyx ( unit- sepal)

Corolla (unit-petal)

Androecium (stamen)

Gynoecium (carpel/pistil)

5. Ans: The picture above is pollen on the female part of a flower. This process is called__Pollination__ . The 5-part structure that has the pollen on it is called the ___Stigma__ . The slender red part of the flower in the image above is called the ____Style___.