FAQ

when you look at a pine or maple tree, the plant you see is a __________.

In what structure would you find the male gametophyte in Pine?

The male cone produces tiny amounts of pollen grains that become the male gametophyte. Each pollen grain is reduced to two or three cells in a waxy protective coat. These grains have winglike structures that allow the wind to carry them up the tree to the female cones.

Which of these contains a male gametophyte?

Pollen Pollen grains
Pollen. Pollen grains (from the greek palynos for dust or pollen) contain the male gametophyte (microgametophyte) phase of the plant. Pollen grains are produced by meiosis of microspore mother cells that are located along the inner edge of the anther sacs (microsporangia).

Which statement is true of the Pine life cycle?

Conifer pollen grains contain male gametophytes is true in the pine life cycle.

Which structures are haploid?

The haploid structures are the pollen, endosperms, and megaspores, while the sporophyte is diploid, which eventually forms the plant body, such as leaves.

Are pine trees sporophyte or gametophyte dominant?

Examples include conifers such as pine and spruce trees. The gymnosperm life cycle has a dominant sporophyte generation. Both gametophytes and the next generation’s new sporophytes develop on the sporophyte parent plant. … Each male gametophyte consists of several cells enclosed within a grain of pollen.

Is a pine tree a gametophyte?

Pine trees are conifers (cone bearing) and carry both male and female sporophylls on the same mature sporophyte. Therefore, they are monoecious plants. … Some gametophytes will land on a female cone. Pollination is defined as the initiation of pollen tube growth.

Which is are gametophyte in Pinus?

The female gametophyte of Pinus develops from the functional megaspore which enlarges considerably. Development of female gametophyte in Pinus is monosporic, as it develops from one megaspore. -The nucellus of the megaspore divides mitotically forming a large number of nuclei unaccompanied by wall formation.

What is the male gametophyte of angiosperm?

Pollen
The male gametophyte of angiosperm is Pollen after germination. Megagametophyte is the egg which produces gametophyte and the sperm which produces gametophyte is known as the microgametophyte.

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What is male gamete in plants?

Pollen grains are the male gamete in plants.

Which Pine Cone produces pollen?

Male pine cones
Each female pine cone has numerous spirally arranged scales, with two seeds on each fertile scale. Male pine cones produce pollen, which is like a powder. The male cones release their pollen, which is carried around the air by blowing wind, and hopefully to another female pine cone on a different pine tree.

Where does embryo develop in Sac?

angiosperm development

…in this group as the embryo sac, develops from the parent spore while it is still retained in the sporangium. Three cell divisions result in eight nuclei, which arrange themselves so that three lie at each end and two lie in the centre.

Where is the Megaspore produced?

ovule
In gymnosperms and flowering plants, the megaspore is produced inside the nucellus of the ovule. During megasporogenesis, a diploid precursor cell, the megasporocyte or megaspore mother cell, undergoes meiosis to produce initially four haploid cells (the megaspores).

Which is haploid in gymnosperms?

Megaspore is haploid in gymnosperms, while the megaspore mother cell is diploid and meiosis leads to four megaspores being produced. The embryo sac is formed by functional megaspores. The endosperm is formed before fertilization and is thus haploid.

Which has largest gametophyte?

Moss
Moss has the largest gametophyte. Mosses are small, soft plants that are typically 1 -10 cm tall, some species are much larger. They commonly grow close together in clumps or mats in damp or shady locations.

What is endosperm quizlet?

Endosperm. Is a tissue produced inside the seeds of most of the flowering plants around the time of fertilization. It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein. Primary endosperm nucleus. Results from the fusion of the male.

What is the sporophyte of a pine?

The sporophytes of all conifers are trees or shrubs. They have a life span that ranges from a few decades to more than 5,000 years. The ecological role and way of life of this sole photosynthetic phase of the conifer life cycle varies with the size, form, and habitat of each species.

What is the sporophyte of a tree?

A sporophyte (/ˈspɔːr. əˌfaɪt/) is the diploid multicellular stage in the life cycle of a plant or alga. It develops from the zygote produced when a haploid egg cell is fertilized by a haploid sperm and each sporophyte cell therefore has a double set of chromosomes, one set from each parent.

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Does a mature pine tree represent the sporophyte or the gametophyte generation?

Pine trees are conifers (coniferous = cone bearing) and carry both male and female sporophylls on the same mature sporophyte. Therefore, they are monoecious plants. Like all gymnosperms, pines are heterosporous and generate two different types of spores (male microspores and female megaspores).

Is a tree a gametophyte or sporophyte?

Flowering Plants

The tree is diploid and represents the dominant sporophyte generation. In sexual reproduction, it bears flowers in which haploid spores are produced. The spores develop into tiny gametophytes that contain only a few cells.

Is a fern a gametophyte or sporophyte?

Plants we see as ferns or horsetails are the sporophyte generation. The sporophyte generally releases spores in the summer. Spores must land on a suitable surface, such as a moist protected area to germinate and grow into gametophytes.

What plant fertilizes an egg?

Fertilization occurs as a sperm cell in a pollen tube fuses with the egg cell of an ovule, resulting in a plant embryo. … Inside the tubes are the sperm cells that will fertilize the egg cells and cause them to develop into seeds.

Is gametophyte photosynthetic?

Ferns. In most ferns, for example, in the leptosporangiate fern Dryopteris, the gametophyte is a photosynthetic free living autotrophic organism called a prothallus that produces gametes and maintains the sporophyte during its early multicellular development.

Is Pinus monoecious or dioecious?

– Pinus is a monoecious gymnosperm, having both male and female cones on the same plant and the male and female strobilus are borne on seperate strobili.

What is Pinus ovule?

A megasporangium or ovule of Pinus is orthotropous. It consists of nucellus covered by single integument (unitegmic). The integument is divided into an outer fleshy layer, a middle stony layer and an inner fleshy layer.

What is the male gametophyte in seed plants?

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.

Where is the male gametophyte found in angiosperms?

anthers
Angiosperms also have the unique property of double fertilization, producing a usually triploid endosperm in addition to the embryo. The male gametophyte is formed in the anthers of the stamens, and the female gametophyte is located in the ovules within the pistil.

What is endosperm in angiosperm?

In angiosperms, the endosperm is the main nutritive tissue for the embryo. The endosperm is the product of double fertilization during which out of the two male gametes, one fertilizes egg to form zygote and other fuses with secondary nuclei to form triploid endosperm.

What is 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. … These cells develop into sperm or ova.

What is a gamete in a plant?

Gametes can be described as sex cells of plants. Like humans, plants have sperm and egg cells that need to fuse in order to produce a zygote, or fertilized egg. Unlike humans, however, plants produce both types of these cells. Male and female gametes and their definition.

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Is pollen a male gamete?

Pollen consists of one or more vegetative cells and a reproductive cell. A pollen grain itself is not the male gamete. In angiosperms and certain gymnosperms, the vegetative cell forms the pollen tube that grows to meet the unfertilized ovules, and the reproductive cell is the source of the sperm.

What trees produce pine cones?

Pine cones only come from pine trees, although all conifers produce cones. Pine cones and pine trees belong to a group of plants called gymnosperms and date back to prehistoric times. Gymnosperms are a group of plants who have naked seeds, not enclosed in an ovary.

Are pine trees?

Pine trees are evergreen, coniferous resinous trees (or, rarely, shrubs) growing 3–80 m (10–260 ft) tall, with the majority of species reaching 15–45 m (50–150 ft) tall. … This tree can be found in the White Mountains of California.

Where do pine trees produce pollen?

cones
The male pinecone, or microstrobilus, produces the pollen, or male gametes. The cones are covered with fertile scales (modified leaves), each of which bears two pollen sacs. In the spring or early summer, the pollen sacs release their pollen grains, each of which has two air bladders for wind dispersal.

What is the embryo?

embryo, the early developmental stage of an animal while it is in the egg or within the uterus of the mother. In humans the term is applied to the unborn child until the end of the seventh week following conception; from the eighth week the unborn child is called a fetus.

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