What is Protonema of mosses?
What is Protonema of mosses?
A protonema (plural: protonemata) is a thread-like chain of cells that forms the earliest stage of development of the gametophyte (the haploid phase) in the life cycle of mosses. It represents the juvenile gametophyte.
What is the purpose of function of the Moss Protonema?
The protonema, which grows directly from the germinating spore, is in most mosses an extensive, branched system of multicellular filaments that are rich in chlorophyll. This stage initiates the accumulation of hormones that influence the further growth of newly formed cells.
Is Moss Protonema haploid or diploid?
It consists of upright, slender axes bearing spirally arranged leaves attached to the soil through multicellular and branched rhizoids. This stage bears the sex organs. So, the correct answer is ‘Haploid and is found in mosses’.
Is the Protonema part of the gametophyte or Sporophyte generation?
The gametophyte refers to all organs and tissues that are a part of the haploid generation. There are two different developmental stages of the gametophyte: the protonema, and the gametophore. The protonema is the first part of the moss that develops from the germinating spore.
What is Protonema with example?
(i) Protonema – It is a creeping, green, branched and frequently filamentous stage. It is a haploid, independent, gametophytic stage in the life cycle of mosses. It is produced from the spores and gives rise to new plants. Examples – Funaria, polytrichum and sphagnum.
What is Antheridium with example?
An antheridium is a haploid structure or organ producing and containing male gametes (called antherozoids or sperm). Many algae and some fungi, for example ascomycetes and water moulds, also have antheridia during their reproductive stages.
What is Protonema Class 11?
Answer. (i) Protonema – It is the first stage in the life cycle of a moss, developing directly from the spore. It consists of creeping, green, branched, and often filamentous structures. (ii) Antheridium – It is the male sex organ present in bryophytes and pteridophytes and is surrounded by a jacket of sterile cells.
What is Isogamy Class 11?
Isogamous is a type of sexual reproduction in which male and female gametes have similar morphology. They have similar shape and size. Anisogamous is a type of reproduction in which male and female gamete have different morphology.
What is Isogamy example?
Isogamy is a form of sexual reproduction that involves gametes of similar morphology (generally similar in shape and size), found in most unicellular organisms. Because both gametes look alike, they generally cannot be classified as male or female.
Is human reproduction Oogamous?
Oogamy is the familiar form of sexual reproduction. It is a form of anisogamy (heterogamy) in which the female gamete (e.g. egg cell) is significantly larger than the male gamete and is non-motile.
What is Isogamous give an example?
Many algae and some fungi have isogamous gametes. In most sexual reproduction, as in mammals for example, the ovum is quite larger and of different appearance than the sperm cell. This condition is called anisogamy.
In which plant is Isogametes seen?
Hint: Isogametes are seen in algae like Spirogyra, Chlamydomonas, and a few more species. Humans have two different types of gametes known as heterogametes. They both have a dissimilar appearance i.e size, shape everything is different.
What is called Isogamous reproduction of algae?
In some algae, the gametes may be highly dimorphic. The larger, non-motile gamete is called as an egg or ovum and the smaller, motile one is called as the sperm or spermatozoid. A spermatozoid unites with an egg and this type of sexual reproduction is known as oogamy.
What is Isogametes?
: a gamete indistinguishable in form or size or behavior from another gamete with which it can unite to form a zygote.
Is Cladophora an Isogamete?
Sexual reproduction : In cladophora the sexual reproduction is isogamous. Almost all the species are heterothallic. The isogametes are formed in the same way as the zoospores are formed.
What are Isogametes and Anisogametes?
Isogametes ate gametes which are similar in size and structure, They are only physiologically different. While anisogametes differ in size and structure. Usually females gametes are larger and non motile while male gametes are small and motile.
What are Isogametes and Heterogametes?
Homogametes are also known as isogametes. Homogametes are similar in morphological appearance and male and female gametes can’t be distinguished. For example, in Rhizopus. Heterogametes are the gametes that are morphologically dissimilar and thus, male and female gametes can be distinguished.
What is the difference between Homogametes and Heterogametes?
Was this answer helpful?…
| Homogametes | Heterogametes |
|---|---|
| This gametes are produced by some algae and fungi. | This gametes are produced in the sexually developed organisms. |
| The common examples are Rhizopus and Ulothrix. | The common examples are gymnosperms and angiosperms. |
Does Fucus produce Homogametes?
Answer. Fucus is an alga which produce motile homogametes.
Does rhizopus have Isogametes?
1) Isogametes of Rhizopus and Heterogametes of Fucus- Rhizopus is a saprophytic fungus which can grow as filamentous branching hyphae. In oomycetes of Fucus, large non-motile female fuses with motile male gametes….
| A | B | |
|---|---|---|
| (4) | Isogametes of Chara | Heterogametes of Synchytrium |
Which member produces Isogametes?
Isogamy involves the fusion of gametes which are morphologically similar but physiologically distinct. Such gametes are called isogametes and produced in vegetative cells called gametangia. Isogametes may be planogametes (e.g. Ulothrix, Chlamydomonas) or aplanogametes (e.g. Spirogyra).
What is Isogamy and Heterogamy?
Isogamy is the type of sexual reproduction involving fusion of the male and female gametes of similar shape and size (morphology). Heterogamy is the type of sexual reproduction that involves the fusion of male and female gametes of different shape and size (morphology).
What type of reproduction would you expect to take place in spirogyra in a warm January?
Conjugation, a form of sexual reproduction in Spirogyra. The conjugation tubes between the two algal filaments allow the contents of one cell to fuse with those of the other, forming a zygote. The characteristic spiral chloroplasts are clearly visible.
Is algae a plant or bacteria?
What are algae? Algae are photosynthetic creatures. They are neither plant, animal or fungi. Many algae are single celled, however some species are multicellular.
What is the difference between a plant and algae?
The main difference between algae and plants is that they are different in their cell compositions. Algae can be found as unicellular or multicellular organisms, while plants cannot be unicellular. The second important difference between the two organisms is that unlike algae, plants have vascular anatomies.
Are algae alive?
Algae are organisms, or living things, that are found all over the world. Algae are very important because they make much of Earth’s oxygen, which humans and other animals need to breathe. Some algae, such as seaweed, look like plants. However, algae are actually neither plants nor animals.