Where is the male gametophyte contained in a seed plant?
Where is the male gametophyte contained in a seed plant?
Angiosperm male gametophytes have two haploid nuclei (the germ nucleus and tube nucleus) contained within the exine of the pollen grain (or microspore). Female gametophytes of flowering plants develop within the ovule (megaspore) contained within an ovary at the base of the pistil of the flower.
What is the male gametophyte in seed plants?
pollen grain
Which of these structures contains a male gametophyte?
A pollen grain contains the male gametophyte. Pollination of the ovule begins the process of fertilization, which results in the merging of the haploid male and female gametophytes to form a diploid zygote. You just studied 38 terms!
Which of these structures is considered to be the male gametophyte of a flowering plant?
Pollen grains are the male gametophytes in flowering plants. Inside the pollen grain, the microspore divides to form two cells, a tube cell and a cell that will act as the sperm.
What is the first organ to emerge from a germinating Eudicot seed?
worktest questions for Unit 2
| Question | |
|---|---|
| What is the function of the integument of an ovule? | D |
| A fruit includes: | E |
| What is the first organ to emerge from a germinating eudicot seed? | B |
| Which of the following “vegetables” is botanically a fruit? | D |
What is the female gametophyte called?
megagametophyte
What is female germ unit?
The female germ unit is comprised of the egg, two synergids, and the central cell. As such, it constitutes the minimum number of cells required to (1) receive the pollen tube, (2) cause the discharge of the sperm into the receptive portion of the female gametophyte, and (3) undergo double fertilization.
Is ovule the female gametophyte?
In seed plants, the ovule is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: the integument, forming its outer layer, the nucellus (or remnant of the megasporangium), and the female gametophyte (formed from a haploid megaspore) in its center.
What is the most common type of female gametophyte with eight nuclei?
Amborella
Why do 3 Megaspores degenerate?
In each megasporangium (the female carrier of spores) a megasporocyte is present which leads to four megaspores after meiosis. three of these megaspores degenerate, only one megaspore is functional and forms the megagametophyte with two or three archegonia containing each one egg cell.
What type of ovule is found in capsella?
Campylotropous ovule
What is male and female gametophyte?
The male gametophyte is formed in the anthers of the stamens, and the female gametophyte is located in the ovules within the pistil. In the anther, four pollen sacs (locules) contain numerous microspore mother cells, each of which undergoes meiosis to produce four microspores in a tetrad (Figure 2A).
What is the difference between gametophyte and Sporophyte?
The plant’s haploid phase is called gametophyte and the diploid phase is called the sporophyte….
| Difference Between Gametophyte and Sporophyte | |
|---|---|
| Sporophytes | Gametophytes |
| Sporophytes have two sets of chromosomes | Gametophytes have a single set of chromosomes |
What are the two types of Gametophytes?
These spores develop into two distinct types of gametophytes; one type produces sperm and the other produces eggs. The male gametophyte develops reproductive organs called antheridia (produce sperm) and the female gametophyte develops archegonia (produce eggs).
What is the difference between male gamete and male gametophyte?
A male gametophyte is a haploid adult stage of a male organism that produces gametes. Male gametes are haploid cells produced inside a gametophyte and fuses with female gamete for fertilization.
What is male gamete?
Gametes are an organism’s reproductive cells. They are also referred to as sex cells. Female gametes are called ova or egg cells, and male gametes are called sperm. Gametes are haploid cells, and each cell carries only one copy of each chromosome.
Which is the first cell of male gametophyte?
After meiosis, the haploid microspores undergo several changes to give rise to pollen grains which later produce the sperm cells or male gametes. In this process, the microscope is the first haploid cell produced and hence, is considered as the first cell of the male gametophyte.
What is mega Sporogenesis?
Megasporogenesis refers to the development of megaspores from the megasporocyte, the cell that undergoes meiosis. Meiosis of the megasporocyte nucleus results in the formation of four haploid megaspore nuclei. In most taxa, meiosis is followed by cytokinesis, resulting in four megaspore cells.
Are Megaspores produced by mitosis?
During megasporogenesis, a diploid precursor cell, the megasporocyte or megaspore mother cell, undergoes meiosis to produce initially four haploid cells (the megaspores). The megaspore then undergoes megagametogenesis to give rise to the female [gametophyte].
What is the difference between Megasporogenesis and Megagametogenesis?
The difference between the megasporogenesis and megagametogenesis is as follows: Explanation: In the megasporogenesis the diploid megaspore mother cell undergoes meiosis to form four haploid megaspores whereas in the megagametogenesis the megaspore develops into female gamete.
How Megaspore is formed?
What is the meaning of Nucellus?
: the central and chief part of a plant ovule that encloses the female gametophyte.
What is the ploidy of Megaspore?
Nucellus(located within the integumentary) have 2n ploidy. The functional megaspore is haploid in nature.
What is equivalent to Megasporangium?
Megasporangium is equivalent to the ovule. Megasporangium ovule is connected to the placenta with a stalk called funicle.
What is the difference between Megaspore and Megasporangium?
As nouns the difference between megaspore and megasporangium is that megaspore is (botany) the larger spore of a heterosporous plant, typically producing a female gametophyte while megasporangium is (biology) a sporangium which produces only megaspores.
Are Megasporocytes haploid or diploid?
A megaspore mother cell, or megasporocyte, is a diploid cell in plants in which meiosis will occur, resulting in the production of four haploid megaspores. At least one of the spores develop into haploid female gametophytes (megagametophytes). The megaspore mother cell arises within the megasporangium tissue.
How many cells and nucleus are present in embryo sac?
seven cells
How many eggs are present in embryo sac?
one egg
How many cells are present in embryo?
What is embryo sac and its types?
Types of embryo Sac Development The classification is based on: The number of 9 ses or spore nuclei entering into the formation of embryo sac Thus embryo sac may be monosporic, bisporic or tetrasporic tyr. The number, arrangement, and chromosome number of the nuclei in the mature embryo sac.