Do echinoderms present internal or external fecundation? Is there sex division among individuals?

Do echinoderms present internal or external fecundation? Is there sex division among individuals?
by

1 Answer

Answer :

The fecundation in echinoderms is external, gametes are liberated in water where fecundation occurs. The majority of echinoderms are dioecious with male and female individuals.
by
selected by

Related questions

Is fecundation in mammals internal or external?

Description : Is fecundation in mammals internal or external?

Last Answer : Fecundation in mammals is internal, with copulation. In the contemporary world human technology is able to promote artificial external fecundation of human gametes and of gametes of other animals.

Is fecundation in amphibians external or internal? In this aspect are amphibians evolutionarily proximal to fishes or to reptiles?

Description : Is fecundation in amphibians external or internal? In this aspect are amphibians evolutionarily proximal to fishes or to reptiles?

Last Answer : In the majority of the amphibian species fecundation is external. This feature is common to bony fishes too and it shows that the reproductive system and the embryonic development of ... egg cells. This phenomenon does not characterize internal fecundation since the gametes unite in water.

How is fecundation done in insects (external or internal)? Is there copulation between insects?

Description : How is fecundation done in insects (external or internal)? Is there copulation between insects?

Last Answer : Fecundation in insects is internal, with copulation.

In the context of strategic management, stakeholders can be defined as: A. An individual or group with a financial stake in the organization B. An external individual or group that is able to impose constraints on the organization C. Internal groups or individuals that are able to influence strategic direction of the organization D. An individual or group with an interest in the organization's activities and who seeks to influence them

Description : In the context of strategic management, stakeholders can be defined as: A. An individual or group with a financial stake in the organization B. An external individual or group that is able to ... individual or group with an interest in the organization's activities and who seeks to influence them

Last Answer : Internal groups or individuals that are able to influence strategic direction of the organization

In the context of strategic management, stakeholders can be defined as: A. An individual or group with a financial stake in the organization B. An external individual or group that is able to impose constraints on the organization C. Internal groups or individuals that are able to influence strategic direction of the organization D. An individual or group with an interest in the organization's activities and who seeks to influence them

Description : In the context of strategic management, stakeholders can be defined as: A. An individual or group with a financial stake in the organization B. An external individual or group that is able to ... individual or group with an interest in the organization's activities and who seeks to influence them

Last Answer : Internal groups or individuals that are able to influence strategic direction of the organization

How can the endoskeleton of echinoderms be characterized in comparison to analogous structures present in vertebrates, arthropods and molluscs?

Description : How can the endoskeleton of echinoderms be characterized in comparison to analogous structures present in vertebrates, arthropods and molluscs?

Last Answer : The echinoderm skeleton is internal, i.e., it is an endoskeleton. It is made of calcium carbonate (calcareous). Vertebrates also have internal skeleton made of bones and cartilages. Arthropods ... of chitin, a chitinous exoskeleton. Some molluscs present a calcareous shell that works as exoskeleton.

How different are fecundation in osteichthyes and in chondrichthyes?

Description : How different are fecundation in osteichthyes and in chondrichthyes?

Last Answer : In chondrichthyes fecundation is internal by means of copulation. In osteichthyes fecundation generally is external and the gametes are released in the water, where they can fecundate their counterpart and form the zygote.

What are the types of fecundation that occur in arthropods? What is the predominant type?

Description : What are the types of fecundation that occur in arthropods? What is the predominant type?

Last Answer : In arthropods there are species having external fecundation and other species having internal fecundation. Internal fecundation is predominant.

(a) If a normal human cell has 46 chromosomes, how many chromosomes will be there in a human: (i) Sperm (ii) Zygote (b) Name an animal in which individuals can change sex. What does this indicate? -Science

Description : (a) If a normal human cell has 46 chromosomes, how many chromosomes will be there in a human: (i) Sperm (ii) Zygote (b) Name an animal in which individuals can change sex. What does this indicate? -Science

Last Answer : (a) A normal human being has 46 chromosomes in which 23 chromosomes come from males and 23 chromosomes come from female. (i) Sperms coming from males have 23 chromosomes. (ii) Zygote forming in ... chromosomes in all. (b) Snail. This indicates that sex is not determined genetically in such animals.

Which of the following statements is true with regard to the relationship among audit risk, audit evidence, and materiality? a. The lower the inherent risk and control risk, the lower the aggregate materiality threshold. b. Under conditions of high inherent and control risk, the auditor should place more emphasis on obtaining external evidence and should reduce reliance on internal evidence. c. Where inherent risk is high and control risk is low, the auditor may safely ignore inherent risk. d. Aggregate materiality thresholds should not change under conditions of changing risk levels

Description : Which of the following statements is true with regard to the relationship among audit risk, audit evidence, and materiality? a. The lower the inherent risk and control risk, the lower ... inherent risk. d. Aggregate materiality thresholds should not change under conditions of changing risk levels

Last Answer : Under conditions of high inherent and control risk, the auditor should place more emphasis on obtaining external evidence and should reduce reliance on internal evidence

Which of the following is NOT a characteristic of Strategic Mgt that makes it different : A. It is interdisciplinary B. It has an external focus C. It has an internal focus D. It is concerned with the present direction of the Organisation

Description : Which of the following is NOT a characteristic of Strategic Mgt that makes it different : A. It is interdisciplinary B. It has an external focus C. It has an internal focus D. It is concerned with the present direction of the Organisation

Last Answer : It is concerned with the present direction of the Organisation

Generally the external and internal validity is present in the inference, we get from Options: A) Experimental method B) Survey method C) Ex Post Facto method D) None of the above

Description : Generally the external and internal validity is present in the inference, we get from Options: A) Experimental method B) Survey method C) Ex Post Facto method D) None of the above

Last Answer : C) Ex Post Facto method 

Which of the following traits is not characteristics of echinoderms ?

Description : Which of the following traits is not characteristics of echinoderms ?

Last Answer : Which of the following traits is not characteristics of echinoderms ? A. Water vascular system B. Trochophore larva C. Tube feet D. Enterocoel

Echinoderms are closely related to chordates due to the following characters .

Description : Echinoderms are closely related to chordates due to the following characters .

Last Answer : Echinoderms are closely related to chordates due to the following characters . A. Tube- within - ... have mesodermal endoskeleton . D. All of these

Which of the following statement is incorrect for echinoderms ?

Description : Which of the following statement is incorrect for echinoderms ?

Last Answer : Which of the following statement is incorrect for echinoderms ? A. The most distinctive feature ... D. They have well- developed circulatory system.

Echinoderms and chordates have

Description : Echinoderms and chordates have

Last Answer : Echinoderms and chordates have A. Pseudocoel B. Shizocoelom C. Enterocoelom D. Hemocoel

Are echinoderms endothermic?

Description : Are echinoderms endothermic?

Last Answer : Yes

Not all animals have a circulatory system. Poriferans, cnidarians, platyhelminthes and nematodes (in these there are the pseudocoelom fluid but no vessels) are avascular animals. Echinoderms do not have true circulatory systems either.

Description : Not all animals have a circulatory system. Poriferans, cnidarians, platyhelminthes and nematodes (in these there are the pseudocoelom fluid but no vessels) are avascular animals. Echinoderms do not have true circulatory systems either.

Last Answer : What is the alternative means for transport of substances in animals without a circulatory system? Why is blood important for larger animals?

Evolutionarily protochordates may be intermediate animals between invertebrates and vertebrates. Imagine a scientist is testing the hypothesis that vertebrates evolved from echinoderms. Having as research object a newly found protochordate species, what is an example of a discovery that would weaken the hypothesis? What is an example of a discovery that would strengthen it?

Description : Evolutionarily protochordates may be intermediate animals between invertebrates and vertebrates. Imagine a scientist is testing the hypothesis that vertebrates evolved from echinoderms. Having as research object a newly ... the hypothesis? What is an example of a discovery that would strengthen it?

Last Answer : Hypothesis to be tested: Vertebrates evolved from echinoderms. Testing material: A newly found protochordate species (i.e., a vertebrate forerunner). Example of weakening observation (that ... shows how science works, beginning with the placement of hypothesis and further observational testing.)

Echinoderm identity card. How are echinoderms characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Description : Echinoderm identity card. How are echinoderms characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Last Answer : Examples of representing beings: sea cucumber, sea urchin, starfishes. Basic morphology: calcareous endoskeleton with spines, ambulacral system. Type of symmetry: secondary radial. Germ layers and ... cephalization. Types of reproduction: sexual, with larval stage. Phylum Chordata - Study Here

Is there a larval stage in echinoderms?

Description : Is there a larval stage in echinoderms?

Last Answer : In echinoderms embryonic development is indirect, with ciliated larvae.

How are the symmetry and the nervous system characterized in echinoderms?

Description : How are the symmetry and the nervous system characterized in echinoderms?

Last Answer : Adult echinoderms, along with cnidarians, are the animals that present radial symmetry, i.e., their body structures are distributed around a center. The radial symmetry in echinoderms however ... to follow the pentaradial structure of the body. Phylum Echinodermata - Image Diversity: radial symmetry

Do echinoderms have an excretory system? How is excretion done in these animals?

Description : Do echinoderms have an excretory system? How is excretion done in these animals?

Last Answer : Echinoderms do not have an excretory system. Their excretions are eliminated by diffusion.

Do echinoderms have respiratory and circulatory systems?

Description : Do echinoderms have respiratory and circulatory systems?

Last Answer : In echinoderms there are not well-defined respiratory (with the exception of the holothurian group) and circulatory systems. The ambulacral hydrovascular system plays the function of these systems.

What is the embryonic characteristic that evolutionarily makes echinoderms proximal to chordates?

Description : What is the embryonic characteristic that evolutionarily makes echinoderms proximal to chordates?

Last Answer : Echinoderms and chordates are deuterostomes, i.e., in their embryonic development the blastopore turns into the anus. All other animals with complete digestive system are protostomes, i. ... digestive tube that appears in the embryonic development. Phylum Echinodermata - Image Diversity: blastopore

What is the type of digestive system of echinoderms?

Description : What is the type of digestive system of echinoderms?

Last Answer : Echinoderms present a complete digestive system, with mouth and anus.

What is the system that permits movement and fixation to echinoderms?

Description : What is the system that permits movement and fixation to echinoderms?

Last Answer : The system that permits movement and fixation to substrates in echinoderms is called the ambulacral system. In these animals water enters through a structure called madreporite, passes through ... emptied by water thus acting as suckers. Phylum Echinodermata - Image Diversity: ambulacral system

What are the basic morphological features of echinoderms?

Description : What are the basic morphological features of echinoderms?

Last Answer : Echinoderms, as the name indicates (echino = spiny, derma = skin), are creatures with spines originated from an endoskeleton. Their endoskeleton is made of calcareous plaques that besides spines ... have pentaradial symmetry; the radial symmetry in these animals is secondary, present only in adults.

Under which environments do echinoderms live?

Description : Under which environments do echinoderms live?

Last Answer : Echinoderms are marine animals, they live in salt water.

The canal system is a characteristic feature of (a) echinoderms (b) sponges (c) helminthes (d) coelenterates.

Description : The canal system is a characteristic feature of (a) echinoderms (b) sponges (c) helminthes (d) coelenterates.

Last Answer : (b) sponges

Select the taxon mentioned that represents both marine and fresh water species. (a) Echinoderms (b) Ctenophora (c) Cephalochordata (d) Cnidaria

Description : Select the taxon mentioned that represents both marine and fresh water species. (a) Echinoderms (b) Ctenophora (c) Cephalochordata (d) Cnidaria

Last Answer : (d) Cnidaria

Which of the following animals are true coelomates with bilateral symmetry? (a) Adult Echinoderms (b) Aschelminthes (c) Platyhelminthes (d) Annelids

Description : Which of the following animals are true coelomates with bilateral symmetry? (a) Adult Echinoderms (b) Aschelminthes (c) Platyhelminthes (d) Annelids

Last Answer : (d) Annelids

How can a person have a sex chromosome that differs from their external appearance?

Description : How can a person have a sex chromosome that differs from their external appearance?

Last Answer : 1) Mosaics (more than one set of genes in one body).2) Any type of hormone error that produces hormones that don'twork right.

In the context of strategic management, stakeholders can be defined as: a) An individual or group with a financial stake in the organization b) An external individual or group that is able to impose constraints on the organizationInternal groups or individuals that are able to influence strategic direction of the organizationd) An individual or group with an interest in the organization's activities and who seeks to influence them

Description : In the context of strategic management, stakeholders can be defined as: a) An individual or group with a financial stake in the organization b) An external individual or group that is able to ... individual or group with an interest in the organization's activities and who seeks to influence them

Last Answer : An individual or group with an interest in the organization's activities and who seeks to influence them

The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for (a) maintaining the scrotal temperature lower than the internal body temperature (b) escaping any possible compression by the visceral organs (c) providing more space for the growth of epididymis (d) providing a secondary sexual feature for exhibiting the male sex.

Description : The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for (a) maintaining the scrotal temperature lower than the internal body ... growth of epididymis (d) providing a secondary sexual feature for exhibiting the male sex.

Last Answer : (a) maintaining the scrotal temperature lower than the internal body temperature

Which one of the following is an example of management expectations from the independent auditors? a. An expert providing a written communication as the product of the engagement. b. Individuals who perform day-to-day accounting functions on behalf of the company. C. AN active participant in management decision-making. d. An internal source of expertise on financial and other matters

Description : Which one of the following is an example of management expectations from the independent auditors? a. An expert providing a written communication as the product of the engagement. b. Individuals who ... in management decision-making. d. An internal source of expertise on financial and other matters

Last Answer : An expert providing a written communication as the product of the engagement

__ is defined as th ned as the use of c e use of commercial ma cial marketing concep ng concepts and t ts and tools in ools in programs designed to influence individual’s behavior to designed to influence individual’s behavior to improve their well-being and that of ove their well-being and that of society. a. Unsought product b. Internal marketing Internal marketing c. Social marketing d. Product line

Description : __ is defined as th ned as the use of c e use of commercial ma cial marketing concep ng concepts and t ts and tools in ools in programs designed to influence individual's behavior to ... of society. a. Unsought product b. Internal marketing Internal marketing c. Social marketing d. Product line

Last Answer : c. Social marketing

Internal validity refers to which of the following? a. The ability to infer that a casual relationship exists between 2 variables b. The extent to which study results can be generalized to and across populations of persons, settings, and times c. The use of effective measurement instruments in the study d. The ability to generalize the study results to individuals not included in the study

Description : Internal validity refers to which of the following? a. The ability to infer that a casual relationship exists between 2 variables b. The extent to which study results can be generalized to and ... the study d. The ability to generalize the study results to individuals not included in the study

Last Answer : b. The extent to which study results can be generalized to and across populations of persons, settings, and times

As per 2011 census, among the following States, which State has the lowest child-sex ratio? (1) Chhattisgarh (2) Punjab (3) Kerala (4) Haryana

Description : As per 2011 census, among the following States, which State has the lowest child-sex ratio? (1) Chhattisgarh (2) Punjab (3) Kerala (4) Haryana

Last Answer : (4) Haryana Explanation: In the Census 2011, Haryana (834), Punjab (846), Jammu & Kashmir (862), Delhi (871) and Chandigarh (880) had the lowest child sex-ratios. In the period 1991-2011, child sex-ratio declined from 943 to 919, whereas the overall sex-ratio climbed up to 945 from 927.

Assertion (A) `:` Natural selection is the outcome of difference in survival and reproduction among individuals that show variation in one or more tra

Description : Assertion (A) `:` Natural selection is the outcome of difference in survival and reproduction among individuals that show variation in one or more tra

Last Answer : Assertion (A) `:` Natural selection is the outcome of difference in survival and reproduction among ... If both the assertion and reason are false.

How can diseases be transmitted among various individuals?

Description : How can diseases be transmitted among various individuals?

Last Answer : In order for transmission among individuals to occur, the pathogenic microorganisms must leave the body through a portal of exit. Transmission can occur in the form of respiratory secretions ... contact made during sexual intercourse, is another mechanism for transport to the next individual.

What are the two main features of Genetic Algorithm? a) Fitness function & Crossover techniques b) Crossover techniques & Random mutation c) Individuals among the population & Random mutation d) Random mutation & Fitness function

Description : What are the two main features of Genetic Algorithm? a) Fitness function & Crossover techniques b) Crossover techniques & Random mutation c) Individuals among the population & Random mutation d) Random mutation & Fitness function

Last Answer : a) Fitness function & Crossover techniques

An intentional act by one or more individuals among management, employees, or third parties which results in misrepresentation of financial statements refers to a. Illegal acts b. Error c. Fraud d. Noncompliance

Description : An intentional act by one or more individuals among management, employees, or third parties which results in misrepresentation of financial statements refers to a. Illegal acts b. Error c. Fraud d. Noncompliance

Last Answer : Fraud

Which of the following is not among the reasons for complexity of decisions? (a) Individuals have different risk propensities. (b) There are many criteria for making choices. (c) Decisions have immediate, short-term impact. ; (d) Managers often share decisions.

Description : Which of the following is not among the reasons for complexity of decisions? (a) Individuals have different risk propensities. (b) There are many criteria for making choices. (c) Decisions have immediate, short-term impact. ; (d) Managers often share decisions.

Last Answer : (c) Decisions have immediate, short-term impact. ;

The term intra-individual differences refers to Options: A) Differences among the various in a given individual B) Differences in a given trait between two or more individuals C) Differences in a given trait individual associated with the passage of time (maturation and learning)errant curricula D) Differences in a given trait in a given individual associated with errors of measures

Description : The term intra-individual differences refers to Options: A) Differences among the various in a given individual B) Differences in a given trait between two or more individuals C) Differences in a ... curricula D) Differences in a given trait in a given individual associated with errors of measures

Last Answer : A) Differences among the various in a given individual 

Thei internal cavity commonly formed by ell division prior to gastrulation is the

Description : Thei internal cavity commonly formed by ell division prior to gastrulation is the

Last Answer : Thei internal cavity commonly formed by ell division prior to gastrulation is the A. Enteron B. Blastopore C. Blastocoel D. Coelom.

In first generation computers, internal processing functions were measured by what division of time?

Description : In first generation computers, internal processing functions were measured by what division of time?

Last Answer : Thousandths of a second (millisecond).

Sex chromatin present in `:-`

Description : Sex chromatin present in `:-`

Last Answer : Sex chromatin present in `:-` A. Drum stick like in lobe of Neutrophil B. Drum stick like ... of Eosinophil D. Drum stick like in lobe of limphocyte

Which of the following statement(s) is/are true concerning hemophilia A? a. Hemophilia A is inherited as a sex-linked recessive deficiency of factor VIII b. A positive family history for bleeding disorders present in all patients c. Laboratory tests reveal a prolongation of aPTT, prothrombin time (PT), thrombin clotting time and platelet aggregation d. Spontaneous bleeding is unusual with factor VIII levels greater than 10% of normal

Description : Which of the following statement(s) is/are true concerning hemophilia A? a. Hemophilia A is inherited as a sex-linked recessive deficiency of factor VIII b. A positive family history for ... platelet aggregation d. Spontaneous bleeding is unusual with factor VIII levels greater than 10% of normal

Last Answer : Answer: a, d Hemophilia A is inherited as a sex-linked recessive deficiency of factor VIII although 0% of cases are secondary to spontaneous mutation. The incidence of this abnormality is ... factor levels as low as 1% have been noted and patients are at risk for spontaneous bleeding

Which one of the following is true of IgE? 1) Is present in plasma in the same concentration as IgG 2) Is increased acutely in an asthmatic attack 3) Crosses the normal placenta 4) Is increased in the serum of atopic individuals 5) Is involved in type 2 hypersensitivity

Description : Which one of the following is true of IgE? 1) Is present in plasma in the same concentration as IgG 2) Is increased acutely in an asthmatic attack 3) Crosses the normal placenta 4) Is increased in the serum of atopic individuals 5) Is involved in type 2 hypersensitivity

Last Answer : Answers-4 IgG is the predominant form of immunoglobulin in plasma at a concentration around 10,000 times that of IgE. IgG crosses the placenta to confer immunity to the fetus but IgE does ... frequently increased in those with atopy but serum IgE does not rise acutely during an asthmatic attack.