Table of Contents
How does the planarian reproduce?
Asexual freshwater planarians reproduce by tearing themselves into two pieces by a process called binary fission. The resulting head and tail pieces regenerate within about a week, forming two new worms.
How do platyhelminthes reproduce asexually?
Asexually, flatworms procreate via fragmentation and budding. Fragmentation, also called cloning, occurs when a flatworm splits off a part of its body, allowing the separated portion to regenerate into a new worm.
Do roundworms reproduce asexually?
Roundworms reproduce sexually. Sperm and eggs are produced by separate male and female adults. Fertilization takes place inside the female organism.
How does a Turbellaria reproduce?
Turbellarians are simultaneous hermaphrodites and lay eggs bundled into cocoons. The young undergo direct development and hatch as juveniles. Spiral cleavage is prevalent. Some turbellarians can reproduce asexually by fission.
How planaria reproduce explain with diagram?
The regeneration of an organism occurs by the process of growth and development The cells of body part which has been cut down gets divides and makes a ball of cells. These multiple cells result in formation of tissues and forms organs again and results in regeneration of another Planaria.
What does it mean by planaria reproduces by the process of regeneration?
Answer: Planarian asexual reproduction, or regeneration, occurs when the flatworm experiences an injury that splits the worm. Planarian worms can be cut into as many as 1/279th of the original body plan and regenerate into fully formed genetic copies.
What type of reproduction occurs in platyhelminthes?
Flatworms are hermaphroditic (having both male and female sex organs) and they typically reproduce both sexually and asexually. The majority of sexual reproduction is through cross-fertilization (where both individuals fertilize each other).
How do polychaete reproduce?
Earthworms reproduce sexually by aligning their bodies and exchanging sperm. On the other hand, polychaetes, which are mostly marine, reproduce asexually. One way they might do this is by fission, which is when the worm makes an exact copy of its DNA and then splits into two.
What type of fertilization do roundworms use to reproduce?
Most nematodes are dioecious. Fertilization takes place when males use special copulatory spines to open the females’ reproductive tracts and inject sperm into them. The sperm are unique in that they lack flagellae and move by pseudopodia, like amoebas. Development of fertilized eggs is usually direct.
Can nematodes reproduce asexually?
Nematodes exhibit enormous diversity with respect to the mode of reproduction; some nematodes reproduce sexually, whereas others reproduce asexually. Sexually reproducing nematodes relies on the union of sperm and oocytes for generating zygote.
What are the features of Turbellaria?
- True bilateral symmetry.
- Dorso-ventral flattening of the body.
- Ciliated epidermis.
- System of sheathed nerve fibers.
- Parenchyma between the epidermis and the gastrodermis.
- Some cephalization.
- Blind ending gut.
What is a Turbellaria in biology?
Definition. A taxonomic class belonging to the phylum Platyhelminthes (flatworms) characterized by having a body covered externally with vibrating cilia. Supplement.