Reproductive system of asteroidea, Biology

Assignment Help:

Reproductive System of Asteroidea

Sexes are separate in several asteroids. There are ten (10) gonads, two in each arm. They emerge tuft-like or as cluster of grapes. Mature gonads occupy approximately to the entire arm. The gonopore is located between the bases of the arms. In the majority of sea stars the sperms and eggs are shed into sea water and fertilisation is external. A single female might shed as many as 2.5 million eggs. Development involves a larval stage - the bipinnaria larva. The free swimming larva is provided with ciliary bands and arms which function in both locomotion and feeding. The bipinnaria larva then transforms into another larva, the brachiolaria larva along with the appearance of additional arms at the anterior end. The branchiolaria as compared to metamorphoses into an adult.


Related Discussions:- Reproductive system of asteroidea

Pulmonary artery diastolic pressure, PADP may be determined by measuring th...

PADP may be determined by measuring the end diastolic velocity of PADP = 4 V 2 Pulmonary regurgitant signal and applying the following formula V is  the end diastolic veloci

Define the nutritional assessment tools, Define the Nutritional Assessment ...

Define the Nutritional Assessment Tools? Malnutrition/protein energy malnutrition amongst elderly persons has been observed in various studies -be it hospitalized patients, nur

Which heavy metals cause toxic pollution, Besides mercury which other heavy...

Besides mercury which other heavy metals cause toxic pollution? Examples of other heavy metals that cause toxic pollution are lead, cadmium and chromium.

Parasitology, what is giardia lamblia and deasis

what is giardia lamblia and deasis

Kinds of hermaphroditism, Kinds of Hermaphroditism Depending upon the...

Kinds of Hermaphroditism Depending upon the timing of maturity of the gonads, hermaphroditism can be of two types 1. Simultaneous hermaphroditism . Both male and female g

Retroviral method for gene transfer, R e troviral method: A retrovi...

R e troviral method: A retrovirus is a virus that carries its genetic material in the form of RNA rather than DNA. In this method retroviruses are used as vectors to transf

Procedures related to hygenic care, PROCEDURES RELATED TO HYGENIC CARE ...

PROCEDURES RELATED TO HYGENIC CARE Would you like to remain without a bath on any given day? Do you remain without a bath when you are sick.? No one normally, would like to m

Production diseases, Pr o d u c t i o n Diseases The production...

Pr o d u c t i o n Diseases The production diseases, which were previously referred as metabolic diseases, include diseases like parturient paresis (milk fever), downer

Define the recommended dietary allowance for thiamin (rda), Define the Reco...

Define the Recommended Dietary Allowance for Thiamin (RDA)? Thiamin, as it must be clear by now, is needed mainly for the metabolism of carbohydrate, branch-chained amino aci

Help, about how humans survive and reproduce currently. In your journal, wr...

about how humans survive and reproduce currently. In your journal, write down three adaptations that help humans have differential survivability, and three adaptations that help hu

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd