What is the alternation of generations in algae?

What is the alternation of generations in algae?

Alternation of generations (also known as metagenesis or heterogenesis) is the type of life cycle that occurs in those plants and algae in the Archaeplastida and the Heterokontophyta that have distinct haploid sexual and diploid asexual stages.

What type of life cycle is brown algae?

The filamentous brown alga Ectocarpus has a haploid-diploid life cycle that involves alternation between two morphologically similar generations but a number of variations on this basic cycle are possible.

What is the alternation of generations in plants?

Alternation of generations describes a plant’s life cycle as it alternates between a sexual phase, or generation and an asexual phase. The sexual generation in plants produces gametes, or sex cells and is called the gametophyte generation. The asexual phase produces spores and is called the sporophyte generation.

What is alternation of generations in plants quizlet?

Alternation of Generations. This term refers to the life cycle of most plants in which the generations alternate between haploid gametophytes and diploid sporophytes. All embryophytes and some algae undergo this process.

What is alternation of generations name the two generations in plants life cycle schematically represent different life cycle patterns in plants?

Hence the whole mechanism is called alternation of generations. The two generations or life cycles that occur are called the sporophyte generation and the gametophyte generation. When you speak in genetic terms, it is the rotation in between the haploid and diploid stages.

How do moss plants exhibit alternation of generations?

Each meiospore germinates to form protonema after falling on suitable substrate. A number of leafy moss plants develop from protonema. Thus moss plant, representing gametophytic generation and sporogonium representing sporophytic generation follow each other in alternate sequence, exhibiting alternation of generations.

What is brown algae called?

Phaeophyta
The brown algae (Phaeophyta) are mostly filamentous or thalloid algae, which, as a group, are almost exclusively marine.

What pigments are in brown algae?

The brown colour of these algae results from the dominance of the xanthophyll pigment fucoxanthin, which masks the other pigments, Chlorophyll a and c (there is no Chlorophyll b), beta-carotene and other xanthophylls.

How many of the characters are associated with brown algae?

Question How many of the given characters are associated with brown algae (Laminarin, Sulphated phycocolloids, Apical flagella, Fucoxanthin, Heterokont flagellation, chlorophyll c, Carotenoids, Pear-shaped zoospores, Oogonium, Pyriform gametes, Most complex post- fertilization development)
Class 12th
Type of Answer Video

What is Gametophytic and Sporophytic?

The sexual phase, called the gametophyte generation, produces gametes, or sex cells, and the asexual phase, or sporophyte generation, produces spores asexually. In terms of chromosomes, the gametophyte is haploid (has a single set of chromosomes), and the sporophyte is diploid (has a double set).

Which is an example of alternation of generations?

The classic example is the mosses, where the green plant is a haploid gametophyte and the reproductive phase is the brown diploid sporophyte. The two forms occur together. In bryophytes and mosses, the gametophyte is the dominant generation and the sporophyte are sporangium bearing stalks growing from the gametophyte.

Are the stem holdfast and blade of brown algae?

Are the stem, holdfast, and blade of brown algae the same as stems, roots, and leaves of land plants? Why or why not? Yes, because they serve the same type of functions.

In algae, there is no regular and fixed alternation of generations, as found in higher plants. In all blue green algae, and some Chlorophyceae, such as Protococcus, Scenedesmus, etc., the reproduction is sexual type, and there is no alternation of generations.

What is meant by alternation of generations in plants?

2 red algae 3 brown algae 4 angiosperms 1 green algae Alternation of generations means that plants produce: 1 only haploid multicellular organisms 2 only diploid multicellular organisms 3 only diploid multicellular organisms with single-celled haploid gametes 4 both haploid and diploid multicellular organisms

What is the mode of reproduction in blue green algae?

In all blue green algae, and some Chlorophyceae, such as Protococcus, Scenedesmus, etc., the reproduction is sexual type, and there is no alternation of generations. In the case of simple unicellular Chlorophyceae, such as Chlamydomonas, Sphaerella, etc., which reproduce sexually, there is no distinct sporophytic generation.

How many types of algae are produced by plants?

1 green algae 2 red algae 3 brown algae 4 angiosperms 1 green algae Alternation of generations means that plants produce: 1 only haploid multicellular organisms 2 only diploid multicellular organisms 3 only diploid multicellular organisms with single-celled haploid gametes 4 both haploid and diploid multicellular organisms