Strobilus or cone
is the reproductive structure of gymnosperms. Both male and female strobili can be present on the same (seen in Pinus) or on different trees (seen in Cycas). Gymnosperm plants are heterosporous.
In which one of the following structures is not associated with gymnosperms?
Antheridium
is not found in gymnosperms an angiosperms.
Which structure houses the seed in a Gymnosperm?
Gymnosperm seeds are not enclosed in an ovary; rather, they are only partially sheltered by modified leaves called
sporophylls
. You may recall the term strobilus (plural = strobili) describes a tight arrangement of sporophylls around a central stalk, as seen in pine cones.
Are the reproductive structures of gymnosperms?
Cones
: The reproductive structures of gymnosperms. … Meiosis produces megaspores (haploid), which will develop into female gametophytes, which are retained in the female cone. One of the cells of each female gametophyte develops as an egg.
Which structure will protect and release gymnosperms?
Gymnosperms are a diverse group of plants the protect their seeds with
cones
and do not produce flowers or fruits.
Which is present in gymnosperms?
gymnosperm, any vascular plant that reproduces by means of
an exposed seed
, or ovule—unlike angiosperms, or flowering plants, whose seeds are enclosed by mature ovaries, or fruits. The seeds of many gymnosperms (literally “naked seeds”) are borne in cones and are not visible until maturity.
Which of the following is present in gymnosperms?
Gymnosperms possess needles or scale-like leaves, sometimes flat and large, and evergreen! No vessel elements are found in xylem, so out-competed now by vesseled angiosperms except in certain situations. Gymnosperms exhibit
cones or strobili
, naked seeds (= “gymnosperm”), but not flowers.
What are the similarities and differences between gymnosperms and angiosperms?
| Angiosperm Gymnosperm | The angiosperms have plant parts including the leaves, stems, and roots. The plant parts of gymnosperms are also the same as the angiosperms which include the leaves, stems, and roots. | Angiosperms produce seeds that are enclosed in a covering Gymnosperms produce naked seeds with no outer covering. |
|---|
Are Cycadophyta gymnosperms?
Cycads are
gymnosperms
(naked seeded), meaning their unfertilized seeds are open to the air to be directly fertilized by pollination, as contrasted with angiosperms, which have enclosed seeds with more complex fertilization arrangements.
What is the main characteristic of Gymnosperm seeds?
Their characteristics include
naked seeds, separate female and male gametes, pollination by wind, and tracheids
(which transport water and solutes in the vascular system). Gymnosperm seeds are not enclosed in an ovary; rather, they are exposed on cones or modified leaves.
What are two structures in which Gymnosperm reproduction takes place?
Reproduction in gymnosperms takes place in cones, which are produced by a mature sporophyte plant. Gymnosperms produce two types of cones:
pollen cones and seed cones
. Pollen cones produce the male gametophytes, also called pollen grains.
Where are the reproductive structures of gymnosperms?
In gymnosperms
the cone is the female reproductive part
and the pollen is the male reproductive part. Pine trees and other gymnosperms produce two types of cones. The male cone is called the pollen cone. The larger female cone is the seed cone.
Can gymnosperms reproduce asexually?
In the gymnosperm life cycle,
plants alternate between a sexual phase and an asexual phase
. This type of life cycle is known as alternation of generations. Gamete production occurs in the sexual phase or gametophyte generation of the cycle. Spores are produced in the asexual phase or sporophyte generation.
Do gymnosperms have Archegonia?
Archegonium, the female reproductive organ in ferns and mosses. An archegonium
also occurs in some gymnosperms
, e.g., cycads and conifers. A flask-shaped structure, it consists of a neck, with one or more layers of cells, and a swollen base—the venter—which contains the egg.
What is the female gametophyte in gymnosperms?
The female gametophyte of gymnosperms is
a large and multicellular structure
, and serves the double function of bearing the gametes as well as the nourishment of the developing embryo.
What is the function of gymnosperms?
Uses. Gymnosperms have major economic uses. Pine, fir, spruce, and cedar are all examples of conifers that are used for
lumber, paper production, and resin
. Some other common uses for gymnosperms are soap, varnish, nail polish, food, gum, and perfumes.
