The cells undergo mitosis to either increase in number or grow into a haploid multicellular organism. Some haploid cells develop into gametes by mitosis. The sporic life cycle is common
algae and plants
. The term sporic refers to the fact that spores are the result of meiosis.
Which of the following are examples of Tracheophytes?
Tracheophytes are commonly known as vascular plant that contains lignified and non-lignified tissues which includes the
angiosperm, clubmosses, ferns, horsetails and gymnosperms
.
What is diploid life cycle?
Organisms with a diploid life cycle
spend the majority of their lives as diploid adults
. When they are ready to reproduce, they undergo meiosis and produce haploid gametes. Gametes then unite in fertilization and form a diploid zygote, which immediately enters G
1
of the cell cycle. Next, the zygote’s DNA is replicated.
Which of the following statements best describes the life cycles of Streptophyte Algaeand plants?
Which of the following statements best describes the life cycles of streptophyte algae and plants?
The diploid generation of streptophyte algae is unicellular whereas the diploid generation of plants is multicellular
. One phase of the life cycle is diploid and the other is haploid.
What is a Sporic life cycle?
Sporic Life Cycle
The term sporic refers to the fact that spores are the result of meiosis. The sporic life cycle
results from an alternation between a haploid and a diploid organism
. Because of this, sometimes this cycle is referred to as the “alternation of generations”.
What type of life cycle do bryophytes have?
The life cycle of bryophytes consists of
an alternation of two stages, or generations, called the sporophyte and the gametophyte
. Each generation has a different physical form.
What are the characteristics of tracheophytes?
- They have a root, a stem, and leaves.
- Their stems, roots, and leaves all have vascular systems.
- Tracheophytes have covered sporangia, which has resulted in the evolution of the seed.
- They form a pollen tunnel. …
- They produce flowers and fruits.
It is concluded that currently the two most-favourable hypotheses are that the bryophytes are a monophyletic group, or that a lineage consisting of
liverworts and mosses
branched first among land plants with the hornworts the most-closely related lineage to tracheophytes.
What are tracheophytes describe briefly the five major groups of them?
Tracheophytes can be broken down into three classes:
ferns, gymnosperms, and angiosperms
. Ferns are the least evolved of the tracheophytes; they have vascular systems, and specialized leaf and root structures, but are still dependent on moist environments for reproduction.
Which parts of the life cycle are diploid?
Diploid-dominant life cycle
Early in the development of an animal embryo, special diploid cells, called
germ cells
, are made in the gonads (testes and ovaries). Germ cells can divide by mitosis to make more germ cells, but some of them undergo meiosis, making haploid gametes (sperm and egg cells).
Which group of plants is haploid for most of its life cycle?
The Haploid-Diploid Life Cycle. The haploid-diploid life cycle is the most complex life cycle and thus has lots of variation. It is also the most common life cycle among plants since all land plants, the
vascular plants and the bryophytes
, are haploid-diploid.
In which group of plants is the gametophyte phase dominant?
Thus, the gametophyte stage is dominant in
the more primitive (nonvascular) plants (bryophytes)
, whereas the sporophyte is the dominant phase in the life cycle of higher (i.e., vascular) plants.
What do Microspores develop into in conifers?
Microspores develop into male gametophytes:
pollen grains
. The pollen grains contain the male gamete: sperm. Pollen grains are very durable. Conifers: independent from liquid water.
Which of the features are characteristics of self compatible plants?
Which of the features are characteristics of self-compatible plants?
They have few deleterious recessive alleles
. The first step in the evolution of the seed plant life cycle was likely: the production of two types of spores in separate sporangia.
Which group of plants contains the tallest and oldest trees on earth?
They are woody shrubs, trees or lianas and include no true aquatics and few epiphytes. Of some interest,
gymnosperms
include the tallest, the most massive, and the longest-living individual plants on earth. They are found throughout much of the earth, but form dominant vegetation in many colder and arctic regions.
Which groups of land plants produce sperm?
The megagametophytes produce eggs, whereas
the microgametophytes
produce sperm. Fusion of gametes (fertilization) produces a zygote. The zygote grows into the next generation of sporophyte.
Which pattern of life cycle is exhibited in bryophytes and pteridophytes?
Bryophytes and pteridophytes show
haplo-diplontic
life cycle, i.e. alternation of generation between gametophyte, which is haploid and sporophyte, which is diploid.
What is the difference between zygotic and Sporic life cycles?
In the zygotic life cycle, the zygote is the only diploid cell produced. In the sporic life cycle, you see alternating multicelled 2n and 1n generations
. A sporophyte is a multicelled 2n plant that makes 1n spores by meiosis. A spore undergoes mitosis to form a multicelled 1n plant, the gametophyte.
What are the three groups of bryophytes?
In this part of the website you’ll find descriptions of the features you can see in the three groups of bryophytes – the
hornworts, liverworts and mosses
. The aim is to give you a good understanding of bryophyte structure and of the similarities and differences between the three groups.
What are the 4 groups of bryophytes?
- Mosses – class Bryopsida.
- Liverworts – class Marchantiopsida.
- Hornworts – class Anthocerotopsida.
Which of the following is characteristic of bryophytes?
General Characteristics of Bryophytes:
Plants occur in damp and shaded areas
. The plant body is thallus-like, i.e. prostrate or erect. It is attached to the substratum by rhizoids, which are unicellular or multicellular. They have a root-like, stem-like, and leaf-like structure and lack true vegetative structure.
What characteristics are bryophytes and tracheophytes based on?
Bryophytes and Tracheophytes are the two main categories of plants classified based on
the presence of a vascular system
. They undergo alteration of generations. Both contain a cuticle to protect the plant from dehydration. They are autotrophs that fix energy by photosynthesis.
What is tracheophytes in biology?
Tracheophyte, meaning “tracheid plant,” refers to
the water-conducting cells (called tracheids, or tracheary elements) that show spiral bands like those in the walls of the tracheae, or air tubes, of insects
.
What are characteristics of gymnosperms?
- They do not produce flowers.
- Seeds are not formed inside a fruit. …
- They are found in colder regions where snowfall occurs.
- They develop needle-like leaves.
- They are perennial or woody, forming trees or bushes.
- They are not differentiated into ovary, style and stigma.
Which one of the following is characteristic of a Haplodiplontic life cycle in land plants?
-All the land plants exhibit this haplodiplontic life cycle in which
the sporophyte and gametophyte differ in morphology
. the diploid multicellular individual or generation of a plant with alternation of generations that begins from a diploid zygote and produces haploid spores by meiotic division — compare gametophyte.
Why are gymnosperms and angiosperms called tracheophytes?
Tracheophytes are distinguished from bryophytes by
their highly developed vascular systems
, which facilitate the transport of water and nutrients to all parts of the plant.
Why are tracheophytes called vascular plants?
What are vascular plants? Vascular plants are also called tracheophytes.
The term Tracheophyta is derived from the Greek word trachea (meaning a duct–a vessel in plants)
. The vascular plants are highly ordered, and land plants, including flowering vascular plants and ferns.
