What is the alternation of generations in plants?

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. The haploid spores germinate and grow into a haploid gametophyte.

What is alternation of generation in plants explain the Diplontic life cycle with suitable examples?

The gametophyte is the dominant phase. The diplontic life cycle is commonly seen in gymnosperms and angiosperms with some variations. However, an Alga called Fucus also shows this kind of life cycle. In a diplontic life cycle, the diploid sporophyte is dominant, photosynthetic and is the independent phase of the plant.

What is alternation of generation give example?

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.

What is alternation of generation explain it with reference to the life cycle of moss plant?

Explanation: In most of the plants, the life cycle is completed into two generations, i.e. gametophytic and sporophytic generations. This phenomenon is termed alternation of generations. Moss plant is haploid. It represents gametophytic generation as it reproduces sexually by gametes.

What best describes the alternation of generations?

Alternation of generations, also called metagenesis or heterogenesis, in biology, the alternation of a sexual phase and an asexual phase in the life cycle of an organism. The two phases, or generations, are often morphologically, and sometimes chromosomally, distinct.

What is called alternation of generation?

“Alternation of generations is a type of life cycle in which subsequent generations of plants alternate between diploid and haploid organisms.”

What is Haplodiplontic alternation of generation?

The plant life cycle alternates between haploid and diploid generations. In haplodiplontic life cycles, gametes are not the direct result of a meiotic division. Diploid sporophyte cells undergo meiosis to produce haploid spores.

What is alternation of generation 11 example?

Hint: Alternation of generation refers to the occurrence of diploid and haploid multicellular organisms, giving rise to new organisms. This process allows for both the dynamic and volatile action of sexual reproduction as well as consistence act of asexual reproduction. It is most commonly found in plants and algae.

What is metagenesis with example?

The definition of metagenesis is the reproduction cycle of an organism that alternates between sexual and asexual generations. An example of metagenesis is the reproduction cycle of a cnidarian.

Does alternation of generations occur in all plants?

All plants undergo a life cycle that takes them through both haploid and diploid generations. The fluctuation between these diploid and haploid stages that occurs in plants is called the alternation of generations.

What are the two generations of mosses life cycle?

The life cycle of a moss, like all plants, is characterized by an alternation of generations. A diploid generation, called the sporophyte, follows a haploid generation, called the gametophyte, which is in turn followed by the next sporophyte generation.

What is isomorphic alternation of generation?

In an isomorphic alternation of generations (found in some algae, for example) the sporophyte and gametophyte are morphologically similar or identical; in a heteromorphic alternation of generations they are dissimilar (e.g. in mosses the gametophyte is the dominant and conspicuous generation, whereas in higher plants …

How do you explain alternation of generations?

Alternation of generations, also called metagenesis or heterogenesis, in biology, the alternation of a sexual phase and an asexual phase in the life cycle of an organism . The two phases, or generations, are often morphologically, and sometimes chromosomally, distinct.

What is the significance of alternation of generations?

Alternation of generation is very significant because:It promotes the chances of survival of organisms.The populations become increasingly better adapted to environment. Better chance for survival: During the formation of spores from spore mother cells by meiotic division reshuffling of genes occurs.

What type of reproduction is alternation of generations?

Alternation of generations is a type of life cycle found in terrestrial plants and some algae in which subsequent generations of individuals alternate between haploid and diploid organisms. This can be contrasted to sexual reproduction in animals, in which both haploid and diploid cells are found in every generation.

What are two examples of alternation of generation in biology?

The fern is an example of alternation of generations, in which both a multicellular diploid organism and a multicellular haploid organism occur and give rise to the other. Alternation of generations is easiest to understand by considering the fern. The large, leafy fern is the diploid organism.