section c. A. Study the h Identify the structures shown in (a) of the figure fro
ID: 213047 • Letter: S
Question
section c.
A. Study the h Identify the structures shown in (a) of the figure from yoll ovary to see the ovules inside. NOTE: The carpel contains the female reproductive organ B. s (what are they?) hey?) The stamen contains the male reproductive organs (what are t pollen grain (n) (male gam Ovary Ovule Embryo sac (n) Stigma Carpel Pollen tube FERTILIZATION Sepal Egg (n) Sperm (n) Zygote (2ni) sporophyte (a) Structure of an idealized flower plant (2) Seed Haploid (n) Diploid (2n) Embryo (2 (sporophyt Simple fruit (b) Simplified angiosperm life cycle C. Refer to (b) in the figure above to make sure you understand how the flower fits into the angiosperm life cycle. . Where is pollen produced? . Where is the egg produced? On what female structure does pollen (usually from another plant) fall? . What structure is formed in the female flower part by the pollen grain that enables it to reach the egg? . Where does fertilization occur? What specialized structure forms around the seed? Lab #7-Page 6Explanation / Answer
a. Pollen are nothing but tiny grains which is produced by the male gamete in seed plants. These pollen transfer sperm to the female reproductive structures.
b. Eggs are produced by the female gametophyte inside the ovaries of flowers.
c. When the wind blows the pollen towards the pistil, it gets stuck on the stigma. Or when an animal brushes by the stamens, it carries the pollen on its fur until it falls off near a pistil, or an insect lands on an anther and then lands on the top of a pistil. Not all plants are self-fertilizing, which means that some plants become fertilized by the pollen from other plants, so pollen may travel a long distance before it actually meets up with an ovule to fertilize.
d. Carpels is the main reproductive part of flower, which are fused together in most flowers to form a pistil. Pistil is usually found in the center of the flower, and is essentially a home for the ovules, or eggs. Pistil are of three parts: a sticky part at the top called a stigma, the thin tube leading downward called a style, and the sac at the bottom called an ovary. When the pollen (male gamete) reaches the pistil, it often becomes stuck to the stigma. The pollen then travels down the style into the ovary, where it meets with the ovules and fertilizes them.
e. Sperm cells must be able to reach eggs to undergop fertilization. The sperm cells of a flowering plant are present in pollen grains. Pollination occurs when pollen grains are transported from anthers to stigmas. After the pollen lands on the stigma, a tube like structure grows from the pollen grain through the style of the ovary. Inside the ovary, there is a ovules and each ovule contain an egg. Sperm cells within the pollen grain move down the pollen tube and into the ovule. Fertilization occurs as one of the sperm cells fuse with the egg inside the ovule.
f. The seed is composed of the embryo (the result of fertilization) and tissue from the mother plant.The new seed is formed in plant structures called fruits.
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