The only motile cells produced in land plants are male gametes (spermatozoids), which are reduced to non-flagellated cells in flowering plants and most gymnosperms.
Are male gametes motile in most of the Spermatophytes?
In flowering plants, both male and female gametes are non-motile.
Are Spermatophytes motile?
Cycads and Ginkgo have motile sperms that swim directly to the egg inside the ovule, while conifers and gnetophytes have sperms with no flagella that are conveyed to the egg along a pollen tube which grows through the ovule tissues.
In which plants male gametes are motile?
Anthoceros, Funaria and Spirogyra.
Are male gametes motile in internal fertilization?
Male gametes are always motile and female gametes are non-motile. Male gametes are either motile or non-motile, but female gametes are always non-motile. Male and female gametes are produced in equal numbers.
Are male gametes motile?
Unlike stationary (female) gametes, spherical, motile gametes designated as male could move both horizontally and vertically through the medium, without known means to explain their motility, because no flagella, amoeboid cell-shape changes or mucus trails were observed.
Are male gametes always motile?
The smaller gamete is considered to be male (a sperm cell), whereas the larger gamete is regarded as female (typically an egg cell, if non-motile). There are several types of anisogamy. Both gametes may be flagellated and therefore motile. Alternatively, both of the gametes may be non-flagellated.
What are the general characteristics of Spermatophytes?
- The plant has roots, stems, leaves and seed bearing structures.
- They produce seeds.
- They have chlorophyll hence photosynthetic.
- They have vascular tissue is highly developed with xylem tissue consisting of both xylem tissue and tracheids.
How do Spermatophytes reproduce?
The spermatophytes (Also called seed plants or Phanerogam) comprise those plants that reproduces by means of seeds not spores. Any plant of the phylum Spermatophyta.
What are examples of Spermatophytes?
Each sperm cell, or spermatozoon, is small and motile. The spermatozoon has a flagellum, which is a tail-shaped structure that allows the cell to propel and move. In contrast, each egg cell, or ovum, is relatively large and non-motile.
Which plants produce non motile male gametes?
The male and female gametes are produced by flowers. Flowers mainly have petals, sepals, stamen, and pistil. Stamen is the male reproductive part and has anther and filament. The anther produces and stores the pollen which is the male gamete and is non-motile.
Which organisms both male and female gametes are motile?
Dear student, In some organisms like fungi and algae both male and female gametes are motile. The male gametes need a medium through which it can move and can reach the female gamete. In plants like algae, bryophytes and pteridophytes water serve as the medium through which gamete transfer takes place.
In which animal the male always occur inside female?
This occurs in most bony fish, many reptiles, some cartilaginous fish, most amphibians, two mammals, and all birds.
In which animal Fertilisation is internal?
Salamanders, spiders, some insects and some molluscs undertake internal fertilization by transferring a spermatophore, a bundle of sperm, from the male to the female.
Where does external fertilization occur?
External fertilization in animals usually occurs in water or in damp areas in a process called spawning. Moisture in the environment keeps the gametes from drying out. Moisture is also important so the eggs and sperm can move around freely, which lets them meet and fuse.